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<div class="subTitle">org.apache.commons.logging.impl</div>
<h2 title="Class LogFactoryImpl" class="title">Class LogFactoryImpl</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging">org.apache.commons.logging.LogFactory</a></li>
<li>
<ul class="inheritance">
<li>org.apache.commons.logging.impl.LogFactoryImpl</li>
</ul>
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<pre>public class <span class="strong">LogFactoryImpl</span>
extends <a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging">LogFactory</a></pre>
<div class="block">Concrete subclass of <a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging"><code>LogFactory</code></a> that implements the
following algorithm to dynamically select a logging implementation
class to instantiate a wrapper for:
<ul>
<li>Use a factory configuration attribute named
<code>org.apache.commons.logging.Log</code> to identify the
requested implementation class.</li>
<li>Use the <code>org.apache.commons.logging.Log</code> system property
to identify the requested implementation class.</li>
<li>If <em>Log4J</em> is available, return an instance of
<code>org.apache.commons.logging.impl.Log4JLogger</code>.</li>
<li>If <em>JDK 1.4 or later</em> is available, return an instance of
<code>org.apache.commons.logging.impl.Jdk14Logger</code>.</li>
<li>Otherwise, return an instance of
<code>org.apache.commons.logging.impl.SimpleLog</code>.</li>
</ul>
<p>
If the selected <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a> implementation class has a
<code>setLogFactory()</code> method that accepts a <a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging"><code>LogFactory</code></a>
parameter, this method will be called on each newly created instance
to identify the associated factory. This makes factory configuration
attributes available to the Log instance, if it so desires.
<p>
This factory will remember previously created <code>Log</code> instances
for the same name, and will return them on repeated requests to the
<code>getInstance()</code> method.</div>
<dl><dt><span class="strong">Version:</span></dt>
<dd>$Id: LogFactoryImpl.java 1449064 2013-02-22 14:49:22Z tn $</dd></dl>
</li>
</ul>
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<h3>Field Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
<caption><span>Fields</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#ALLOW_FLAWED_CONTEXT_PROPERTY">ALLOW_FLAWED_CONTEXT_PROPERTY</a></strong></code>
<div class="block">The name (<code>org.apache.commons.logging.Log.allowFlawedContext</code>)
of the system property which can be set true/false to
determine system behaviour when a bad context-classloader is encountered.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#ALLOW_FLAWED_DISCOVERY_PROPERTY">ALLOW_FLAWED_DISCOVERY_PROPERTY</a></strong></code>
<div class="block">The name (<code>org.apache.commons.logging.Log.allowFlawedDiscovery</code>)
of the system property which can be set true/false to
determine system behaviour when a bad logging adapter class is
encountered during logging discovery.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#ALLOW_FLAWED_HIERARCHY_PROPERTY">ALLOW_FLAWED_HIERARCHY_PROPERTY</a></strong></code>
<div class="block">The name (<code>org.apache.commons.logging.Log.allowFlawedHierarchy</code>)
of the system property which can be set true/false to
determine system behaviour when a logging adapter class is
encountered which has bound to the wrong Log class implementation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#allowFlawedContext">allowFlawedContext</a></strong></code>
<div class="block">See getBaseClassLoader and initConfiguration.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#allowFlawedDiscovery">allowFlawedDiscovery</a></strong></code>
<div class="block">See handleFlawedDiscovery and initConfiguration.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#allowFlawedHierarchy">allowFlawedHierarchy</a></strong></code>
<div class="block">See handleFlawedHierarchy and initConfiguration.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.util.Hashtable</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#attributes">attributes</a></strong></code>
<div class="block">Configuration attributes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private static java.lang.String[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#classesToDiscover">classesToDiscover</a></strong></code>
<div class="block">The names of classes that will be tried (in order) as logging
adapters.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#diagnosticPrefix">diagnosticPrefix</a></strong></code>
<div class="block">The string prefixed to every message output by the logDiagnostic method.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.util.Hashtable</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#instances">instances</a></strong></code>
<div class="block">The <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a> instances that have
already been created, keyed by logger name.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#LOG_PROPERTY">LOG_PROPERTY</a></strong></code>
<div class="block">The name (<code>org.apache.commons.logging.Log</code>) of the system
property identifying our <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a> implementation class.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#LOG_PROPERTY_OLD">LOG_PROPERTY_OLD</a></strong></code>
<div class="block">The deprecated system property used for backwards compatibility with
old versions of JCL.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#logClassName">logClassName</a></strong></code>
<div class="block">Name of the class implementing the Log interface.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.lang.reflect.Constructor</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#logConstructor">logConstructor</a></strong></code>
<div class="block">The one-argument constructor of the
<a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a>
implementation class that will be used to create new instances.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.lang.Class[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#logConstructorSignature">logConstructorSignature</a></strong></code>
<div class="block">The signature of the Constructor to be used.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#LOGGING_IMPL_JDK14_LOGGER">LOGGING_IMPL_JDK14_LOGGER</a></strong></code>
<div class="block">Jdk14Logger class name</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#LOGGING_IMPL_LOG4J_LOGGER">LOGGING_IMPL_LOG4J_LOGGER</a></strong></code>
<div class="block">Log4JLogger class name</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#LOGGING_IMPL_LUMBERJACK_LOGGER">LOGGING_IMPL_LUMBERJACK_LOGGER</a></strong></code>
<div class="block">Jdk13LumberjackLogger class name</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#LOGGING_IMPL_SIMPLE_LOGGER">LOGGING_IMPL_SIMPLE_LOGGER</a></strong></code>
<div class="block">SimpleLog class name</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.lang.reflect.Method</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#logMethod">logMethod</a></strong></code>
<div class="block">The one-argument <code>setLogFactory</code> method of the selected
<a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a> method, if it exists.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.lang.Class[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#logMethodSignature">logMethodSignature</a></strong></code>
<div class="block">The signature of the <code>setLogFactory</code> method to be used.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#PKG_IMPL">PKG_IMPL</a></strong></code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#PKG_LEN">PKG_LEN</a></strong></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#useTCCL">useTCCL</a></strong></code>
<div class="block">Determines whether logging classes should be loaded using the thread-context
classloader, or via the classloader that loaded this LogFactoryImpl class.</div>
</td>
</tr>
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<h3>Fields inherited from class org.apache.commons.logging.<a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging">LogFactory</a></h3>
<code><a href="../../../../../org/apache/commons/logging/LogFactory.html#DIAGNOSTICS_DEST_PROPERTY">DIAGNOSTICS_DEST_PROPERTY</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#factories">factories</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#FACTORY_DEFAULT">FACTORY_DEFAULT</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#FACTORY_PROPERTIES">FACTORY_PROPERTIES</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#FACTORY_PROPERTY">FACTORY_PROPERTY</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#HASHTABLE_IMPLEMENTATION_PROPERTY">HASHTABLE_IMPLEMENTATION_PROPERTY</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#nullClassLoaderFactory">nullClassLoaderFactory</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#PRIORITY_KEY">PRIORITY_KEY</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#SERVICE_ID">SERVICE_ID</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#TCCL_KEY">TCCL_KEY</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#LogFactoryImpl()">LogFactoryImpl</a></strong>()</code>
<div class="block">Public no-arguments constructor required by the lookup mechanism.</div>
</td>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging">Log</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#createLogFromClass(java.lang.String,%20java.lang.String,%20boolean)">createLogFromClass</a></strong>(java.lang.String logAdapterClassName,
java.lang.String logCategory,
boolean affectState)</code>
<div class="block">Attempts to load the given class, find a suitable constructor,
and instantiate an instance of Log.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging">Log</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#discoverLogImplementation(java.lang.String)">discoverLogImplementation</a></strong>(java.lang.String logCategory)</code>
<div class="block">Attempts to create a Log instance for the given category name.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#findUserSpecifiedLogClassName()">findUserSpecifiedLogClassName</a></strong>()</code>
<div class="block">Checks system properties and the attribute map for
a Log implementation specified by the user under the
property names <a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#LOG_PROPERTY"><code>LOG_PROPERTY</code></a> or <a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#LOG_PROPERTY_OLD"><code>LOG_PROPERTY_OLD</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getAttribute(java.lang.String)">getAttribute</a></strong>(java.lang.String name)</code>
<div class="block">Return the configuration attribute with the specified name (if any),
or <code>null</code> if there is no such attribute.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.String[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getAttributeNames()">getAttributeNames</a></strong>()</code>
<div class="block">Return an array containing the names of all currently defined
configuration attributes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getBaseClassLoader()">getBaseClassLoader</a></strong>()</code>
<div class="block">Return the classloader from which we should try to load the logging
adapter classes.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getBooleanConfiguration(java.lang.String,%20boolean)">getBooleanConfiguration</a></strong>(java.lang.String key,
boolean dflt)</code>
<div class="block">Get the setting for the user-configurable behaviour specified by key.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected static java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getClassLoader(java.lang.Class)">getClassLoader</a></strong>(java.lang.Class clazz)</code>
<div class="block">Workaround for bug in Java1.2; in theory this method is not needed.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getConfigurationValue(java.lang.String)">getConfigurationValue</a></strong>(java.lang.String property)</code>
<div class="block">Attempt to find an attribute (see method setAttribute) or a
system property with the provided name and return its value.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected static java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getContextClassLoader()">getContextClassLoader</a></strong>()</code>
<div class="block">Gets the context classloader.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getContextClassLoaderInternal()">getContextClassLoaderInternal</a></strong>()</code>
<div class="block">Calls LogFactory.directGetContextClassLoader under the control of an
AccessController class.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging">Log</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getInstance(java.lang.Class)">getInstance</a></strong>(java.lang.Class clazz)</code>
<div class="block">Convenience method to derive a name from the specified class and
call <code>getInstance(String)</code> with it.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging">Log</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getInstance(java.lang.String)">getInstance</a></strong>(java.lang.String name)</code>
<div class="block">Construct (if necessary) and return a <code>Log</code> instance,
using the factory's current set of configuration attributes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getLogClassName()">getLogClassName</a></strong>()</code>
<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>Never invoked by this class; subclasses should not assume
it will be.</i></div>
</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.lang.reflect.Constructor</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getLogConstructor()">getLogConstructor</a></strong>()</code>
<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>Never invoked by this class; subclasses should not assume
it will be.</i></div>
</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getLowestClassLoader(java.lang.ClassLoader,%20java.lang.ClassLoader)">getLowestClassLoader</a></strong>(java.lang.ClassLoader c1,
java.lang.ClassLoader c2)</code>
<div class="block">Given two related classloaders, return the one which is a child of
the other.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getParentClassLoader(java.lang.ClassLoader)">getParentClassLoader</a></strong>(java.lang.ClassLoader cl)</code>
<div class="block">Fetch the parent classloader of a specified classloader.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#getSystemProperty(java.lang.String,%20java.lang.String)">getSystemProperty</a></strong>(java.lang.String key,
java.lang.String def)</code>
<div class="block">Read the specified system property, using an AccessController so that
the property can be read if JCL has been granted the appropriate
security rights even if the calling code has not.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#handleFlawedDiscovery(java.lang.String,%20java.lang.ClassLoader,%20java.lang.Throwable)">handleFlawedDiscovery</a></strong>(java.lang.String logAdapterClassName,
java.lang.ClassLoader classLoader,
java.lang.Throwable discoveryFlaw)</code>
<div class="block">Generates an internal diagnostic logging of the discovery failure and
then throws a <code>LogConfigurationException</code> that wraps
the passed <code>Throwable</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#handleFlawedHierarchy(java.lang.ClassLoader,%20java.lang.Class)">handleFlawedHierarchy</a></strong>(java.lang.ClassLoader badClassLoader,
java.lang.Class badClass)</code>
<div class="block">Report a problem loading the log adapter, then either return
(if the situation is considered recoverable) or throw a
LogConfigurationException.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#informUponSimilarName(java.lang.StringBuffer,%20java.lang.String,%20java.lang.String)">informUponSimilarName</a></strong>(java.lang.StringBuffer messageBuffer,
java.lang.String name,
java.lang.String candidate)</code>
<div class="block">Appends message if the given name is similar to the candidate.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#initConfiguration()">initConfiguration</a></strong>()</code>
<div class="block">Initialize a number of variables that control the behaviour of this
class and that can be tweaked by the user.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#initDiagnostics()">initDiagnostics</a></strong>()</code>
<div class="block">Calculate and cache a string that uniquely identifies this instance,
including which classloader the object was loaded from.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#isDiagnosticsEnabled()">isDiagnosticsEnabled</a></strong>()</code>
<div class="block">Workaround for bug in Java1.2; in theory this method is not needed.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#isJdk13LumberjackAvailable()">isJdk13LumberjackAvailable</a></strong>()</code>
<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>Never invoked by this class; subclasses should not assume
it will be.</i></div>
</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#isJdk14Available()">isJdk14Available</a></strong>()</code>
<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>Never invoked by this class; subclasses should not assume
it will be.</i></div>
</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#isLog4JAvailable()">isLog4JAvailable</a></strong>()</code>
<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>Never invoked by this class; subclasses should not assume
it will be.</i></div>
</div>
</td>
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<td class="colFirst"><code>private boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#isLogLibraryAvailable(java.lang.String,%20java.lang.String)">isLogLibraryAvailable</a></strong>(java.lang.String name,
java.lang.String classname)</code>
<div class="block">Utility method to check whether a particular logging library is
present and available for use.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#logDiagnostic(java.lang.String)">logDiagnostic</a></strong>(java.lang.String msg)</code>
<div class="block">Output a diagnostic message to a user-specified destination (if the
user has enabled diagnostic logging).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging">Log</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#newInstance(java.lang.String)">newInstance</a></strong>(java.lang.String name)</code>
<div class="block">Create and return a new <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a>
instance for the specified name.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#release()">release</a></strong>()</code>
<div class="block">Release any internal references to previously created
<a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a>
instances returned by this factory.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#removeAttribute(java.lang.String)">removeAttribute</a></strong>(java.lang.String name)</code>
<div class="block">Remove any configuration attribute associated with the specified name.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#setAttribute(java.lang.String,%20java.lang.Object)">setAttribute</a></strong>(java.lang.String name,
java.lang.Object value)</code>
<div class="block">Set the configuration attribute with the specified name.</div>
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<h3>Methods inherited from class org.apache.commons.logging.<a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging">LogFactory</a></h3>
<code><a href="../../../../../org/apache/commons/logging/LogFactory.html#createFactory(java.lang.String,%20java.lang.ClassLoader)">createFactory</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#directGetContextClassLoader()">directGetContextClassLoader</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#getFactory()">getFactory</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#getLog(java.lang.Class)">getLog</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#getLog(java.lang.String)">getLog</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#handleThrowable(java.lang.Throwable)">handleThrowable</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#logRawDiagnostic(java.lang.String)">logRawDiagnostic</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#newFactory(java.lang.String,%20java.lang.ClassLoader)">newFactory</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#newFactory(java.lang.String,%20java.lang.ClassLoader,%20java.lang.ClassLoader)">newFactory</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#objectId(java.lang.Object)">objectId</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#release(java.lang.ClassLoader)">release</a>, <a href="../../../../../org/apache/commons/logging/LogFactory.html#releaseAll()">releaseAll</a></code></li>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<pre>private static final java.lang.String LOGGING_IMPL_LOG4J_LOGGER</pre>
<div class="block">Log4JLogger class name</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.logging.impl.LogFactoryImpl.LOGGING_IMPL_LOG4J_LOGGER">Constant Field Values</a></dd></dl>
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<pre>private static final java.lang.String LOGGING_IMPL_JDK14_LOGGER</pre>
<div class="block">Jdk14Logger class name</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.logging.impl.LogFactoryImpl.LOGGING_IMPL_JDK14_LOGGER">Constant Field Values</a></dd></dl>
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<pre>private static final java.lang.String LOGGING_IMPL_LUMBERJACK_LOGGER</pre>
<div class="block">Jdk13LumberjackLogger class name</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.logging.impl.LogFactoryImpl.LOGGING_IMPL_LUMBERJACK_LOGGER">Constant Field Values</a></dd></dl>
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<pre>private static final java.lang.String LOGGING_IMPL_SIMPLE_LOGGER</pre>
<div class="block">SimpleLog class name</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.logging.impl.LogFactoryImpl.LOGGING_IMPL_SIMPLE_LOGGER">Constant Field Values</a></dd></dl>
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<pre>private static final java.lang.String PKG_IMPL</pre>
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<pre>private static final int PKG_LEN</pre>
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<h4>LOG_PROPERTY</h4>
<pre>public static final java.lang.String LOG_PROPERTY</pre>
<div class="block">The name (<code>org.apache.commons.logging.Log</code>) of the system
property identifying our <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a> implementation class.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.logging.impl.LogFactoryImpl.LOG_PROPERTY">Constant Field Values</a></dd></dl>
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<h4>LOG_PROPERTY_OLD</h4>
<pre>protected static final java.lang.String LOG_PROPERTY_OLD</pre>
<div class="block">The deprecated system property used for backwards compatibility with
old versions of JCL.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.logging.impl.LogFactoryImpl.LOG_PROPERTY_OLD">Constant Field Values</a></dd></dl>
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<pre>public static final java.lang.String ALLOW_FLAWED_CONTEXT_PROPERTY</pre>
<div class="block">The name (<code>org.apache.commons.logging.Log.allowFlawedContext</code>)
of the system property which can be set true/false to
determine system behaviour when a bad context-classloader is encountered.
When set to false, a LogConfigurationException is thrown if
LogFactoryImpl is loaded via a child classloader of the TCCL (this
should never happen in sane systems).
Default behaviour: true (tolerates bad context classloaders)
See also method setAttribute.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.logging.impl.LogFactoryImpl.ALLOW_FLAWED_CONTEXT_PROPERTY">Constant Field Values</a></dd></dl>
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<pre>public static final java.lang.String ALLOW_FLAWED_DISCOVERY_PROPERTY</pre>
<div class="block">The name (<code>org.apache.commons.logging.Log.allowFlawedDiscovery</code>)
of the system property which can be set true/false to
determine system behaviour when a bad logging adapter class is
encountered during logging discovery. When set to false, an
exception will be thrown and the app will fail to start. When set
to true, discovery will continue (though the user might end up
with a different logging implementation than they expected).
<p>
Default behaviour: true (tolerates bad logging adapters)
See also method setAttribute.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.logging.impl.LogFactoryImpl.ALLOW_FLAWED_DISCOVERY_PROPERTY">Constant Field Values</a></dd></dl>
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<pre>public static final java.lang.String ALLOW_FLAWED_HIERARCHY_PROPERTY</pre>
<div class="block">The name (<code>org.apache.commons.logging.Log.allowFlawedHierarchy</code>)
of the system property which can be set true/false to
determine system behaviour when a logging adapter class is
encountered which has bound to the wrong Log class implementation.
When set to false, an exception will be thrown and the app will fail
to start. When set to true, discovery will continue (though the user
might end up with a different logging implementation than they expected).
<p>
Default behaviour: true (tolerates bad Log class hierarchy)
See also method setAttribute.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.logging.impl.LogFactoryImpl.ALLOW_FLAWED_HIERARCHY_PROPERTY">Constant Field Values</a></dd></dl>
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<pre>private static final java.lang.String[] classesToDiscover</pre>
<div class="block">The names of classes that will be tried (in order) as logging
adapters. Each class is expected to implement the Log interface,
and to throw NoClassDefFound or ExceptionInInitializerError when
loaded if the underlying logging library is not available. Any
other error indicates that the underlying logging library is available
but broken/unusable for some reason.</div>
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<pre>private boolean useTCCL</pre>
<div class="block">Determines whether logging classes should be loaded using the thread-context
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<pre>private java.lang.String diagnosticPrefix</pre>
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<pre>protected java.util.Hashtable attributes</pre>
<div class="block">Configuration attributes.</div>
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<pre>protected java.util.Hashtable instances</pre>
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<pre>private java.lang.String logClassName</pre>
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<pre>protected java.lang.reflect.Constructor logConstructor</pre>
<div class="block">The one-argument constructor of the
<a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a>
implementation class that will be used to create new instances.
This value is initialized by <code>getLogConstructor()</code>,
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<pre>protected java.lang.Class[] logConstructorSignature</pre>
<div class="block">The signature of the Constructor to be used.</div>
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<pre>protected java.lang.reflect.Method logMethod</pre>
<div class="block">The one-argument <code>setLogFactory</code> method of the selected
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<pre>protected java.lang.Class[] logMethodSignature</pre>
<div class="block">The signature of the <code>setLogFactory</code> method to be used.</div>
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<pre>private boolean allowFlawedContext</pre>
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<pre>private boolean allowFlawedDiscovery</pre>
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<pre>private boolean allowFlawedHierarchy</pre>
<div class="block">See handleFlawedHierarchy and initConfiguration.</div>
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<pre>public LogFactoryImpl()</pre>
<div class="block">Public no-arguments constructor required by the lookup mechanism.</div>
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<pre>public java.lang.Object getAttribute(java.lang.String name)</pre>
<div class="block">Return the configuration attribute with the specified name (if any),
or <code>null</code> if there is no such attribute.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogFactory.html#getAttribute(java.lang.String)">getAttribute</a></code> in class <code><a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging">LogFactory</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - Name of the attribute to return</dd></dl>
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<pre>public java.lang.String[] getAttributeNames()</pre>
<div class="block">Return an array containing the names of all currently defined
configuration attributes. If there are no such attributes, a zero
length array is returned.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogFactory.html#getAttributeNames()">getAttributeNames</a></code> in class <code><a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging">LogFactory</a></code></dd>
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<pre>public <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging">Log</a> getInstance(java.lang.Class clazz)
throws <a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></pre>
<div class="block">Convenience method to derive a name from the specified class and
call <code>getInstance(String)</code> with it.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogFactory.html#getInstance(java.lang.Class)">getInstance</a></code> in class <code><a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging">LogFactory</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>clazz</code> - Class for which a suitable Log name will be derived</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></code> - if a suitable <code>Log</code>
instance cannot be returned</dd></dl>
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<pre>public <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging">Log</a> getInstance(java.lang.String name)
throws <a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></pre>
<div class="block"><p>Construct (if necessary) and return a <code>Log</code> instance,
using the factory's current set of configuration attributes.</p>
<p><strong>NOTE</strong> - Depending upon the implementation of
the <code>LogFactory</code> you are using, the <code>Log</code>
instance you are returned may or may not be local to the current
application, and may or may not be returned again on a subsequent
call with the same name argument.</p></div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogFactory.html#getInstance(java.lang.String)">getInstance</a></code> in class <code><a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging">LogFactory</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - Logical name of the <code>Log</code> instance to be
returned (the meaning of this name is only known to the underlying
logging implementation that is being wrapped)</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></code> - if a suitable <code>Log</code>
instance cannot be returned</dd></dl>
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<pre>public void release()</pre>
<div class="block">Release any internal references to previously created
<a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a>
instances returned by this factory. This is useful in environments
like servlet containers, which implement application reloading by
throwing away a ClassLoader. Dangling references to objects in that
class loader would prevent garbage collection.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogFactory.html#release()">release</a></code> in class <code><a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging">LogFactory</a></code></dd>
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<pre>public void removeAttribute(java.lang.String name)</pre>
<div class="block">Remove any configuration attribute associated with the specified name.
If there is no such attribute, no action is taken.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogFactory.html#removeAttribute(java.lang.String)">removeAttribute</a></code> in class <code><a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging">LogFactory</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - Name of the attribute to remove</dd></dl>
</li>
</ul>
<a name="setAttribute(java.lang.String, java.lang.Object)">
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<h4>setAttribute</h4>
<pre>public void setAttribute(java.lang.String name,
java.lang.Object value)</pre>
<div class="block">Set the configuration attribute with the specified name. Calling
this with a <code>null</code> value is equivalent to calling
<code>removeAttribute(name)</code>.
<p>
This method can be used to set logging configuration programmatically
rather than via system properties. It can also be used in code running
within a container (such as a webapp) to configure behaviour on a
per-component level instead of globally as system properties would do.
To use this method instead of a system property, call
<pre>
LogFactory.getFactory().setAttribute(...)
</pre>
This must be done before the first Log object is created; configuration
changes after that point will be ignored.
<p>
This method is also called automatically if LogFactory detects a
commons-logging.properties file; every entry in that file is set
automatically as an attribute here.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogFactory.html#setAttribute(java.lang.String,%20java.lang.Object)">setAttribute</a></code> in class <code><a href="../../../../../org/apache/commons/logging/LogFactory.html" title="class in org.apache.commons.logging">LogFactory</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - Name of the attribute to set</dd><dd><code>value</code> - Value of the attribute to set, or <code>null</code>
to remove any setting for this attribute</dd></dl>
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<pre>protected static java.lang.ClassLoader getContextClassLoader()
throws <a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></pre>
<div class="block">Gets the context classloader.
This method is a workaround for a java 1.2 compiler bug.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></code></dd><dt><span class="strong">Since:</span></dt>
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<pre>protected static boolean isDiagnosticsEnabled()</pre>
<div class="block">Workaround for bug in Java1.2; in theory this method is not needed.
See LogFactory.isDiagnosticsEnabled.</div>
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<pre>protected static java.lang.ClassLoader getClassLoader(java.lang.Class clazz)</pre>
<div class="block">Workaround for bug in Java1.2; in theory this method is not needed.
See LogFactory.getClassLoader.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.1</dd></dl>
</li>
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<a name="initDiagnostics()">
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<h4>initDiagnostics</h4>
<pre>private void initDiagnostics()</pre>
<div class="block">Calculate and cache a string that uniquely identifies this instance,
including which classloader the object was loaded from.
<p>
This string will later be prefixed to each "internal logging" message
emitted, so that users can clearly see any unexpected behaviour.
<p>
Note that this method does not detect whether internal logging is
enabled or not, nor where to output stuff if it is; that is all
handled by the parent LogFactory class. This method just computes
its own unique prefix for log messages.</div>
</li>
</ul>
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<h4>logDiagnostic</h4>
<pre>protected void logDiagnostic(java.lang.String msg)</pre>
<div class="block">Output a diagnostic message to a user-specified destination (if the
user has enabled diagnostic logging).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>msg</code> - diagnostic message</dd><dt><span class="strong">Since:</span></dt>
<dd>1.1</dd></dl>
</li>
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<a name="getLogClassName()">
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<pre>protected java.lang.String getLogClassName()</pre>
<div class="block"><span class="strong">Deprecated.</span> <i>Never invoked by this class; subclasses should not assume
it will be.</i></div>
<div class="block">Return the fully qualified Java classname of the <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a>
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<pre>protected java.lang.reflect.Constructor getLogConstructor()
throws <a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></pre>
<div class="block"><span class="strong">Deprecated.</span> <i>Never invoked by this class; subclasses should not assume
it will be.</i></div>
<div class="block"><p>Return the <code>Constructor</code> that can be called to instantiate
new <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a> instances.</p>
<p><strong>IMPLEMENTATION NOTE</strong> - Race conditions caused by
calling this method from more than one thread are ignored, because
the same <code>Constructor</code> instance will ultimately be derived
in all circumstances.</p></div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></code> - if a suitable constructor
cannot be returned</dd></dl>
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<pre>protected boolean isJdk13LumberjackAvailable()</pre>
<div class="block"><span class="strong">Deprecated.</span> <i>Never invoked by this class; subclasses should not assume
it will be.</i></div>
<div class="block">Is <em>JDK 1.3 with Lumberjack</em> logging available?</div>
</li>
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<pre>protected boolean isJdk14Available()</pre>
<div class="block"><span class="strong">Deprecated.</span> <i>Never invoked by this class; subclasses should not assume
it will be.</i></div>
<div class="block">Return <code>true</code> if <em>JDK 1.4 or later</em> logging
is available. Also checks that the <code>Throwable</code> class
supports <code>getStackTrace()</code>, which is required by
Jdk14Logger.</div>
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<pre>protected boolean isLog4JAvailable()</pre>
<div class="block"><span class="strong">Deprecated.</span> <i>Never invoked by this class; subclasses should not assume
it will be.</i></div>
<div class="block">Is a <em>Log4J</em> implementation available?</div>
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<pre>protected <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging">Log</a> newInstance(java.lang.String name)
throws <a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></pre>
<div class="block">Create and return a new <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging"><code>Log</code></a>
instance for the specified name.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - Name of the new logger</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></code> - if a new instance cannot
be created</dd></dl>
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<pre>private static java.lang.ClassLoader getContextClassLoaderInternal()
throws <a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></pre>
<div class="block">Calls LogFactory.directGetContextClassLoader under the control of an
AccessController class. This means that java code running under a
security manager that forbids access to ClassLoaders will still work
if this class is given appropriate privileges, even when the caller
doesn't have such privileges. Without using an AccessController, the
the entire call stack must have the privilege before the call is
allowed.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the context classloader associated with the current thread,
or null if security doesn't allow it.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></code> - if there was some weird error while
attempting to get the context classloader.</dd>
<dd><code>java.lang.SecurityException</code> - if the current java security policy doesn't
allow this class to access the context classloader.</dd></dl>
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<a name="getSystemProperty(java.lang.String, java.lang.String)">
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<ul class="blockList">
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<h4>getSystemProperty</h4>
<pre>private static java.lang.String getSystemProperty(java.lang.String key,
java.lang.String def)
throws java.lang.SecurityException</pre>
<div class="block">Read the specified system property, using an AccessController so that
the property can be read if JCL has been granted the appropriate
security rights even if the calling code has not.
<p>
Take care not to expose the value returned by this method to the
calling application in any way; otherwise the calling app can use that
info to access data that should not be available to it.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.SecurityException</code></dd></dl>
</li>
</ul>
<a name="getParentClassLoader(java.lang.ClassLoader)">
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</a>
<ul class="blockList">
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<h4>getParentClassLoader</h4>
<pre>private java.lang.ClassLoader getParentClassLoader(java.lang.ClassLoader cl)</pre>
<div class="block">Fetch the parent classloader of a specified classloader.
<p>
If a SecurityException occurs, null is returned.
<p>
Note that this method is non-static merely so logDiagnostic is available.</div>
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<a name="isLogLibraryAvailable(java.lang.String, java.lang.String)">
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<h4>isLogLibraryAvailable</h4>
<pre>private boolean isLogLibraryAvailable(java.lang.String name,
java.lang.String classname)</pre>
<div class="block">Utility method to check whether a particular logging library is
present and available for use. Note that this does <i>not</i>
affect the future behaviour of this class.</div>
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<h4>getConfigurationValue</h4>
<pre>private java.lang.String getConfigurationValue(java.lang.String property)</pre>
<div class="block">Attempt to find an attribute (see method setAttribute) or a
system property with the provided name and return its value.
<p>
The attributes associated with this object are checked before
system properties in case someone has explicitly called setAttribute,
or a configuration property has been set in a commons-logging.properties
file.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the value associated with the property, or null.</dd></dl>
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<pre>private boolean getBooleanConfiguration(java.lang.String key,
boolean dflt)</pre>
<div class="block">Get the setting for the user-configurable behaviour specified by key.
If nothing has explicitly been set, then return dflt.</div>
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<h4>initConfiguration</h4>
<pre>private void initConfiguration()</pre>
<div class="block">Initialize a number of variables that control the behaviour of this
class and that can be tweaked by the user. This is done when the first
logger is created, not in the constructor of this class, because we
need to give the user a chance to call method setAttribute in order to
configure this object.</div>
</li>
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<a name="discoverLogImplementation(java.lang.String)">
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<h4>discoverLogImplementation</h4>
<pre>private <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging">Log</a> discoverLogImplementation(java.lang.String logCategory)
throws <a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></pre>
<div class="block">Attempts to create a Log instance for the given category name.
Follows the discovery process described in the class javadoc.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>logCategory</code> - the name of the log category</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></code> - if an error in discovery occurs,
or if no adapter at all can be instantiated</dd></dl>
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<a name="informUponSimilarName(java.lang.StringBuffer, java.lang.String, java.lang.String)">
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<h4>informUponSimilarName</h4>
<pre>private void informUponSimilarName(java.lang.StringBuffer messageBuffer,
java.lang.String name,
java.lang.String candidate)</pre>
<div class="block">Appends message if the given name is similar to the candidate.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>messageBuffer</code> - <code>StringBuffer</code> the message should be appended to,
not null</dd><dd><code>name</code> - the (trimmed) name to be test against the candidate, not null</dd><dd><code>candidate</code> - the candidate name (not null)</dd></dl>
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<h4>findUserSpecifiedLogClassName</h4>
<pre>private java.lang.String findUserSpecifiedLogClassName()</pre>
<div class="block">Checks system properties and the attribute map for
a Log implementation specified by the user under the
property names <a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#LOG_PROPERTY"><code>LOG_PROPERTY</code></a> or <a href="../../../../../org/apache/commons/logging/impl/LogFactoryImpl.html#LOG_PROPERTY_OLD"><code>LOG_PROPERTY_OLD</code></a>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>classname specified by the user, or <code>null</code></dd></dl>
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<a name="createLogFromClass(java.lang.String, java.lang.String, boolean)">
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<h4>createLogFromClass</h4>
<pre>private <a href="../../../../../org/apache/commons/logging/Log.html" title="interface in org.apache.commons.logging">Log</a> createLogFromClass(java.lang.String logAdapterClassName,
java.lang.String logCategory,
boolean affectState)
throws <a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></pre>
<div class="block">Attempts to load the given class, find a suitable constructor,
and instantiate an instance of Log.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>logAdapterClassName</code> - classname of the Log implementation</dd><dd><code>logCategory</code> - argument to pass to the Log implementation's constructor</dd><dd><code>affectState</code> - <code>true</code> if this object's state should
be affected by this method call, <code>false</code> otherwise.</dd>
<dt><span class="strong">Returns:</span></dt><dd>an instance of the given class, or null if the logging
library associated with the specified adapter is not available.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></code> - if there was a serious error with
configuration and the handleFlawedDiscovery method decided this
problem was fatal.</dd></dl>
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<h4>getBaseClassLoader</h4>
<pre>private java.lang.ClassLoader getBaseClassLoader()
throws <a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></pre>
<div class="block">Return the classloader from which we should try to load the logging
adapter classes.
<p>
This method usually returns the context classloader. However if it
is discovered that the classloader which loaded this class is a child
of the context classloader <i>and</i> the allowFlawedContext option
has been set then the classloader which loaded this class is returned
instead.
<p>
The only time when the classloader which loaded this class is a
descendant (rather than the same as or an ancestor of the context
classloader) is when an app has created custom classloaders but
failed to correctly set the context classloader. This is a bug in
the calling application; however we provide the option for JCL to
simply generate a warning rather than fail outright.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></code></dd></dl>
</li>
</ul>
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<h4>getLowestClassLoader</h4>
<pre>private java.lang.ClassLoader getLowestClassLoader(java.lang.ClassLoader c1,
java.lang.ClassLoader c2)</pre>
<div class="block">Given two related classloaders, return the one which is a child of
the other.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>c1</code> - is a classloader (including the null classloader)</dd><dd><code>c2</code> - is a classloader (including the null classloader)</dd>
<dt><span class="strong">Returns:</span></dt><dd>c1 if it has c2 as an ancestor, c2 if it has c1 as an ancestor,
and null if neither is an ancestor of the other.</dd></dl>
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<h4>handleFlawedDiscovery</h4>
<pre>private void handleFlawedDiscovery(java.lang.String logAdapterClassName,
java.lang.ClassLoader classLoader,
java.lang.Throwable discoveryFlaw)</pre>
<div class="block">Generates an internal diagnostic logging of the discovery failure and
then throws a <code>LogConfigurationException</code> that wraps
the passed <code>Throwable</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>logAdapterClassName</code> - is the class name of the Log implementation
that could not be instantiated. Cannot be <code>null</code>.</dd><dd><code>classLoader</code> - is the classloader that we were trying to load the
logAdapterClassName from when the exception occurred.</dd><dd><code>discoveryFlaw</code> - is the Throwable created by the classloader</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></code> - ALWAYS</dd></dl>
</li>
</ul>
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<h4>handleFlawedHierarchy</h4>
<pre>private void handleFlawedHierarchy(java.lang.ClassLoader badClassLoader,
java.lang.Class badClass)
throws <a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></pre>
<div class="block">Report a problem loading the log adapter, then either return
(if the situation is considered recoverable) or throw a
LogConfigurationException.
<p>
There are two possible reasons why we successfully loaded the
specified log adapter class then failed to cast it to a Log object:
<ol>
<li>the specific class just doesn't implement the Log interface
(user screwed up), or
<li> the specified class has bound to a Log class loaded by some other
classloader; Log@classloaderX cannot be cast to Log@classloaderY.
</ol>
<p>
Here we try to figure out which case has occurred so we can give the
user some reasonable feedback.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>badClassLoader</code> - is the classloader we loaded the problem class from,
ie it is equivalent to badClass.getClassLoader().</dd><dd><code>badClass</code> - is a Class object with the desired name, but which
does not implement Log correctly.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/logging/LogConfigurationException.html" title="class in org.apache.commons.logging">LogConfigurationException</a></code> - when the situation
should not be recovered from.</dd></dl>
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