Installing JDK (Java Development Kit) in Ubuntu 10.04 Lucid

Trying different operating systems for me is quite refreshing, giving me a different perspective on how things are done (like installing from a CLI or command line). But thanks to the web, we can get numerous help with these things. So I'm sharing this post for those who are using Ubuntu (mine is 10.04 aka Lucid) and Java enthusiast. Luckily, the JDK 6 has been dropped from the Multiverse section of the Ubuntu archive. Following these steps will install the latest JDK in your Ubuntu box.

1. Add the Canonical Partner Repository to your apt repositories: $ sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner"

2. Update the source list  of your repository:  $ sudo apt-get update. After doing so, your machine will download and populate your repository with the proper packages.

3. Install the newly added JDK 6: $ sudo apt-get install sun-java6-jdk. This will then check for the dependencies and install Java in your machine. Accept the license and it's done. The JDK package will be installed in /usr/lib/jvm/java-6-sun-1.6.0.2o4. This will also create a symbolic link that we can use to set our default JDK (java-6-sun).

4. Now select the newly installed JDK as the default Java to use instead of the default openJDK: $ sudo update-java-alternatives -s java-6-sun. After doing so, check if JDK is correctly set up: $ java -version. It should return the newly installed JDK, like in the screenshot below.

And you're done! I hope this post helps my fellow Linux newbies. :)

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Installing JDK (Java Development Kit) in Fedora 14

I'm still learning tricks in working around a Linux kernel, specifically Fedora 14 and may I say it's basically the same with Windows (as pertaining to GUI and applications). But this specific topic is more of manipulated via a command line terminal, except for the download. I'm putting this entry for Linux newbies like me, and get them started in using Fedora 14 worry-free. :)

1. Download the Java Development Kit from Oracle. The latest version as I write this entry is JDK 6 update 24.

 2. Select Linux platform from the dropdown list and agree to the Java SE Development Kit 6u24 License Agreement and click Continue.

 3. Select the Java SE Development Kit 6u24, use the rpm.bin.

 4. After the completing the download, launch a terminal (Applications -> System Tools -> Terminal) and log in as root.

5. Change to the directory where you've downloaded the JDK, and make the bin file into an executable file: $ chmod 755 jdk-6u24-linux-i586-rpm.bin 

6. Execute the installer: $ ./jdk-6u24-linux-i586-rpm.bin. Press enter to finish the installation. This will automatically unpack and install itself in /usr/java/jdk1.6.0_24, and creates two links in the same directory (/usr/java), default and latest.

7. Establish a JAVA_HOME and PATH for all the users by editing the profile file in /etc/profile and adding the two lines at the end of the file:

• JAVA_HOME=/usr/java/default; export JAVA_HOME
• PATH=$JAVA_HOME/bin:$PATH; export PATH

8. Save the file, exit the terminal properly and then logout of the system to make the change take effect. Once logged in, open a terminal and check your java version by typing: $ java -version. The output should be the JDK version that you have just installed (e.g. java version "1.6.0_24").

And there you have it. You can now install other applications with Java/JDK prerequisites.

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