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<h2 title="Interface SingleThreadModel" class="title">Interface SingleThreadModel</h2>
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<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>As of Java Servlet API 2.4, with no direct replacement.</i></div>
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<pre>public interface <span class="strong">SingleThreadModel</span></pre>
<div class="block">Ensures that servlets handle only one request at a time. This interface has
no methods.
<p>
If a servlet implements this interface, you are <i>guaranteed</i> that no two
threads will execute concurrently in the servlet's <code>service</code>
method. The servlet container can make this guarantee by synchronizing access
to a single instance of the servlet, or by maintaining a pool of servlet
instances and dispatching each new request to a free servlet.
<p>
Note that SingleThreadModel does not solve all thread safety issues. For
example, session attributes and static variables can still be accessed by
multiple requests on multiple threads at the same time, even when
SingleThreadModel servlets are used. It is recommended that a developer take
other means to resolve those issues instead of implementing this interface,
such as avoiding the usage of an instance variable or synchronizing the block
of the code accessing those resources. This interface is deprecated in
Servlet API version 2.4.</div>
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