Installing Oracle Java plug-in for Iceweasel

Some web-based management tools use Java applets to perform configuration tasks. Within Debian Squeeze, you have two JRE available : openjdk-6-jre and sun-java6-jre. Concerning web browsers, two kinds of Java plug-ins can be installed : the official Oracle Java plug-in from the sun-java6-plugin package and the alternative Icedtea plug-in  from the icedtea6-plugin package.

The Oracle Java Plug-in is better suited for its integration within web browsers. To install it :

root@localhost:~#apt-get install sun-java6-plugin

To use one implementation of Java (either OpenJDK or Oracle java), make sure that your environment is properly configured. update-java-alternatives (utility from the java-common package) can be used for this purpose.

To list the existing Java environments :

root@localhost:~# update-java-alternatives -l
java-6-openjdk 1061 /usr/lib/jvm/java-6-openjdk
java-6-sun 63 /usr/lib/jvm/java-6-sun

To force the use of one given environment :

root@localhost:~#update-java-alternatives -s java-6-sun

To make sure that your installed applications only use the Oracle Java 6, check the output of update-alternatives -l . You should have the following output :

root@localhost:~#update-alternatives -l |grep java

update-alternatives –get-selections |grep java
appletviewer                   manual   /usr/lib/jvm/java-6-sun/bin/appletviewer
apt                            manual   /usr/lib/jvm/java-6-sun/bin/apt
ControlPanel                   manual   /usr/lib/jvm/java-6-sun/jre/bin/ControlPanel
extcheck                       manual   /usr/lib/jvm/java-6-sun/bin/extcheck
firefox-javaplugin.so          manual   /usr/lib/jvm/java-6-sun/jre/lib/amd64/libnpjp2.so
HtmlConverter                  manual   /usr/lib/jvm/java-6-sun/bin/HtmlConverter
iceape-javaplugin.so           manual   /usr/lib/jvm/java-6-sun/jre/lib/amd64/libnpjp2.so
iceweasel-javaplugin.so        manual   /usr/lib/jvm/java-6-sun/jre/lib/amd64/libnpjp2.so
idlj                           manual   /usr/lib/jvm/java-6-sun/bin/idlj
jar                            manual   /usr/lib/jvm/java-6-sun/bin/jar
jarsigner                      manual   /usr/lib/jvm/java-6-sun/bin/jarsigner
java                           manual   /usr/lib/jvm/java-6-sun/jre/bin/java
javac                          manual   /usr/lib/jvm/java-6-sun/bin/javac
javadoc                        manual   /usr/lib/jvm/java-6-sun/bin/javadoc
javah                          manual   /usr/lib/jvm/java-6-sun/bin/javah
javap                          manual   /usr/lib/jvm/java-6-sun/bin/javap
java_vm                        manual   /usr/lib/jvm/java-6-sun/jre/bin/java_vm
javaws                         manual   /usr/lib/jvm/java-6-sun/jre/bin/javaws
jconsole                       manual   /usr/lib/jvm/java-6-sun/bin/jconsole
jcontrol                       manual   /usr/lib/jvm/java-6-sun/jre/bin/jcontrol
jdb                            manual   /usr/lib/jvm/java-6-sun/bin/jdb
jexec                          manual   /usr/lib/jvm/java-6-sun/jre/lib/jexec
jhat                           manual   /usr/lib/jvm/java-6-sun/bin/jhat
jinfo                          manual   /usr/lib/jvm/java-6-sun/bin/jinfo
jmap                           manual   /usr/lib/jvm/java-6-sun/bin/jmap
jps                            manual   /usr/lib/jvm/java-6-sun/bin/jps
jrunscript                     manual   /usr/lib/jvm/java-6-sun/bin/jrunscript
jsadebugd                      manual   /usr/lib/jvm/java-6-sun/bin/jsadebugd
jstack                         manual   /usr/lib/jvm/java-6-sun/bin/jstack
jstat                          manual   /usr/lib/jvm/java-6-sun/bin/jstat
jstatd                         manual   /usr/lib/jvm/java-6-sun/bin/jstatd
keytool                        manual   /usr/lib/jvm/java-6-sun/jre/bin/keytool
midbrowser-javaplugin.so       manual   /usr/lib/jvm/java-6-sun/jre/lib/amd64/libnpjp2.so
mozilla-javaplugin.so          manual   /usr/lib/jvm/java-6-sun/jre/lib/amd64/libnpjp2.so
native2ascii                   manual   /usr/lib/jvm/java-6-sun/bin/native2ascii
orbd                           manual   /usr/lib/jvm/java-6-sun/jre/bin/orbd
pack200                        manual   /usr/lib/jvm/java-6-sun/jre/bin/pack200
pluginappletviewer             auto     /usr/lib/jvm/java-6-openjdk/jre/bin/pluginappletviewer
policytool                     manual   /usr/lib/jvm/java-6-sun/jre/bin/policytool
rmic                           manual   /usr/lib/jvm/java-6-sun/bin/rmic
rmid                           manual   /usr/lib/jvm/java-6-sun/jre/bin/rmid
rmiregistry                    manual   /usr/lib/jvm/java-6-sun/jre/bin/rmiregistry
schemagen                      manual   /usr/lib/jvm/java-6-sun/bin/schemagen
serialver                      manual   /usr/lib/jvm/java-6-sun/bin/serialver
servertool                     manual   /usr/lib/jvm/java-6-sun/jre/bin/servertool
tnameserv                      manual   /usr/lib/jvm/java-6-sun/jre/bin/tnameserv
unpack200                      manual   /usr/lib/jvm/java-6-sun/jre/bin/unpack200
wsgen                          manual   /usr/lib/jvm/java-6-sun/bin/wsgen
wsimport                       manual   /usr/lib/jvm/java-6-sun/bin/wsimport
xjc                            manual   /usr/lib/jvm/java-6-sun/bin/xjc
xulrunner-1.9-javaplugin.so    manual   /usr/lib/jvm/java-6-sun/jre/lib/amd64/libnpjp2.so
xulrunner-javaplugin.so        manual   /usr/lib/jvm/java-6-sun/jre/lib/amd64/libnpjp2.so

For Iceweasel,you can check that your Java plug-in is configured by typing about:plugins in the address bar.

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