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To get common java applications (installed using .deb-packages) to run under your JVM of choice, make sure you also edit the JVM configuration file:

  sudo nano /etc/jvm

and add the line:

  /usr/lib/j2sdk1.5-sun

Packages such as ant starts the first JVM found in this file.

Java on Konqueror

You may find that Java is disabled, even though it is set up correctly in the "Configure Konqueror" Dialog. Select "HTML Settings->Java" from the Tools menu to enable it.

Java on Mozilla Firefox

Ubuntu/Kubuntu 6.06

• Sun Java5: Install it from the Applications -> Add/Remove... menu, or install the sun-java5-plugin package.

Ubuntu/Kubuntu 5.10

• Sun Java5: After running Direct installation of Sun packages, download sun-java5-plugin_1.5.0-06-1_i386.deb . Install with sudo dpkg -i sun-java5-plugin_1.5.0-06-1_i386.deb

amd64: Installing the Mozilla/Firefox plugin

Note: You should install the rest of Java by one of the above methods.

Providing the Mozilla/Firefox plugin is available in your distribution of the JRE (currently Sun's doesn't include it), you can create a symbolic link to it inside the Mozilla and Firefox plugins directories. Apparently copying the plugin will not work. The installation directory will vary depending on whether you installed using method one or two, so both are documented below: For method one:

$ sudo ln -sf /usr/local/j2re-1.4.2/plugin/amd64/mozilla/libjavaplugin_oji.so /usr/lib/mozilla-firefox/plugins/libjavaplugin.so

$ sudo ln -sf /usr/local/j2re-1.4.2/plugin/amd64/mozilla/libjavaplugin_oji.so /usr/lib/mozilla/plugins/libjavaplugin.so

Or for method two:

$ sudo ln -sf /usr/lib/j2re1.4-blackdown/plugin/amd64/mozilla/libjavaplugin_oji.so /usr/lib/mozilla-firefox/plugins/libjavaplugin.so

$ sudo ln -sf /usr/lib/j2re1.4-blackdown/plugin/amd64/mozilla/libjavaplugin_oji.so /usr/lib/mozilla/plugins/libjavaplugin.so

PowerPC

IBM produces a Java Development Kit (JDK) for its POWER computers, which happens to also work on PPC. They are the only place to make available recent versions of Java for PPC Linux. Their recent versions consist of versions 1.5.0 and 1.4.2 of Java. They also have a 1.3.1 version, but there is no reason to use that. This page will not discuss the use of IBM's 1.3.1 version.

The 1.4.2 JDK is known to work on G3, G4, and G5 Macs, as well as older 604e and 603e Macs. The 1.5.0 JDK is known to work on G3, G4, and G5 Macs, and it is not yet known whether it works on older 604e and 603e Macs. It is not yet known whether either one works on non-Mac PowerPCs. Please update the Wiki if you have more information!

To get IBM's JDK, go to http://www-128.ibm.com/developerworks/java/jdk/linux/download.html, and choose an SDK for 32-bit iSeries/pSeries. Be sure to get the 32-bit version even if you have a G5. You may choose to download both the latest 1.5.0 and 1.4.2 versions and install both if you wish. In any case, periodically check that page for newer Service Releases, and repeat the process described here whenever there is a new one. There is currently no way to keep track of which Service Release you are on under Ubuntu, so make a note of it. As of this writing, SR1 is the latest of the 1.5.0, and SR5 is the latest of the 1.4.2 version. You will have to register before being allowed to download anything. When you reach the download page, download the TGZ version of the SDK.

Installation Process

To use the TGZ with Ubuntu, you have to convert it to a DEB. Make sure you have the tool make-jpkg installed from the Multiverse repository (See ["AddingRepositoriesHowto"]):

        sudo apt-get install java-package

If you are still using Breezy Badger, you will now need to upgrade the version of the package you just installed. To do this, download [http://archive.ubuntu.com/ubuntu/pool/multiverse/j/java-package/java-package_0.27_all.deb this file] to your desktop and type:

        cd ~/Desktop
        sudo dpkg -i java-package_0.27_all.deb

Now convert the 1.4.2 TGZ and install the resulting DEB:

        make-jpkg IBMJava2-SDK-142.ppc.tgz
        sudo dpkg -i ibm-j2sdk1.4_1.4.2_powerpc.deb

Now convert the 1.5.0 TGZ and install the resulting DEB:

        make-jpkg ibm-java2-sdk-50-linux-ppc.tgz
        sudo dpkg -i ibm-j2sdk1.5_1.5.0_powerpc.deb

If you installed a 1.4.2 version, regardless of whether or not you installed a 1.5.0 version, and your processor is not a G5, you must perform yet another step to get it to work. For a G3 or G4, use the following command:

        sudo sh -c 'echo "JITC_PROCESSOR_TYPE=6" >> /etc/environment'

For a 604e or 603e, instead use:

        sudo sh -c 'echo "JITC_PROCESSOR_TYPE=5" >> /etc/environment'

You may have to log out or restart the computer for this to take effect.

IF you installed the JDK, the following code tests that everything's working. Open a terminal, and try this for version 1.4.2:

        cd /usr/lib/j2sdk1.4-ibm/demo/applets/TicTacToe
        ../../../bin/appletviewer example1.html

To try version 1.5.0:

        cd /usr/lib/j2sdk1.5-ibm/demo/applets/TicTacToe
        ../../../bin/appletviewer example1.html

If you see a Tic Tac Toe game, it worked! If you installed the JRE, you don't have an appletviewer or any demos so try whichever program it was that led you to install java in the first place!

Neither the Firefox web browser nor the full Mozilla suite can use version 1.4.2, but they can use 1.5.0 if you configure as follows:

        mkdir -p ~/.mozilla/plugins
        cd ~/.mozilla/plugins
        ln -s /usr/lib/j2sdk1.5-ibm/jre/bin/libjavaplugin_oji.so

To control which Java the Konqueror web browser uses, go to your KDE system settings. Select Internet & Network -> Web Browser -> Java & JavaScript, and change the Path to Java executable to either /usr/lib/j2sdk1.4-ibm/bin/java or /usr/lib/j2sdk1.5-ibm/bin/java. To control which Java the Opera web browser uses, go to Tools -> Preferences -> Advanced -> Content -> Java options, and change the path to either /usr/lib/j2sdk1.4-ibm/jre/bin or /usr/lib/j2sdk1.5-ibm/jre/bin.

work-arounds

ppc: bug #343837

? ln -s /usr/lib/j2sdk1.5-ibm/jre/bin/libjavaplugin_oji.so /usr/lib/mozilla-firefox/plugins ?

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