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/etc/java/security/classpath.security is in libgcj-common 1:4.9.3-9ubuntu1.

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# classpath.security
#    Copyright (C) 2002, 2006 Free Software Foundation, Inc.
# 
# This file is part of GNU Classpath.
# 
# GNU Classpath is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
# 
# GNU Classpath is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with GNU Classpath; see the file COPYING.  If not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA.
# 
# Linking this library statically or dynamically with other modules is
# making a combined work based on this library.  Thus, the terms and
# conditions of the GNU General Public License cover the whole
# combination.
# 
# As a special exception, the copyright holders of this library give you
# permission to link this library with independent modules to produce an
# executable, regardless of the license terms of these independent
# modules, and to copy and distribute the resulting executable under
# terms of your choice, provided that you also meet, for each linked
# independent module, the terms and conditions of the license of that
# module.  An independent module is a module which is not derived from
# or based on this library.  If you modify this library, you may extend
# this exception to your version of the library, but you are not
# obligated to do so.  If you do not wish to do so, delete this
# exception statement from your version.

# The VM-wide default callback handler class name.  MUST be a subclass of
# javax.security.auth.callback.CallbackHandler
auth.login.defaultCallbackHandler=gnu.javax.security.auth.callback.DefaultCallbackHandler

# If this file isn't found we fall back to generating entropy through
# "battling threads".
securerandom.source=file:///dev/urandom

# Note that the settings and ordering here are mirrored in Security.
security.provider.1=gnu.java.security.provider.Gnu
security.provider.2=gnu.javax.crypto.jce.GnuCrypto
security.provider.3=gnu.javax.crypto.jce.GnuSasl
security.provider.4=gnu.javax.net.ssl.provider.Jessie
security.provider.5=gnu.javax.security.auth.callback.GnuCallbacks