n o t e 1 9 . c o m

In Fedora, you’ll need to follow long chain of symbolic links to get to the java command. Running the command which java, yields

/usr/bin/java which is a link to
/etc/alternatives/java which links to
/usr/lib/jvm/jre-1.4.2-gcj/bin/java which links to
/usr/bin/gij.

The default java in Fedora is the GNU java. Changing java to be the latest version of SUN Java is simple. Just follow the instructions below:

1. Download the latest JDK for linux (jdk-6u1-linux-i586-rpm.bin).
2. sh jdk-6u1-linux-i586-rpm.bin This will create the RPM file.
3. su — become root
4. rpm -Uvh jdk-6u1-linux-i586.rpm This will install the JDK in /usr/java/ folder.
5. create the file /etc/profile.d/java.sh with the following content:
   
export JAVA_HOME=/usr/java/jdk1.6.0_01
export JAVA_PATH=$JAVA_HOME
export PATH=$JAVA_HOME/bin:$PATH

   When a user logs in, environment variables are defined & accumulated in the following order:

   1. /etc/profile (for all users)
   2. All the files in the /etc/profile.d directory
   3. Then ~/.bash_profile
   4. Finally ~/.bashrc

6. chmod +x /etc/profile.d/java.sh
7. log out and log back in. Now when you run the command java -version, you’ll see that you’re using the latest version of SUN Java — 1.6.0_01.

This entry was posted on May 20, 2007 at 5:19 am and is filed under Programming. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.