Computer Science Department Java


Ask the System Manager
(Frequently Asked Questions)
by Thomas Wallis

Computer Science Department Java

Introduction:

There are many versions of Java available to the Computer Science student. The LINUX system has a default version, but most people use the Sun version. The Sun version is usually installed in /usr/local. You can look in that directory to see the beginning of the Java directory tree.

The current Sun Java on our Debian Etch system is JDK 1.6.0_02. If you are a Csh user, you can modify your .cshrc.linux and .login.linux files to activate this version of Java. Put the following lines in your .cshrc.linux and .login.linux files: 

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setenv JAVA_HOME "/usr/local/jdk1.6.0_02"
setenv PATH "$JAVA_HOME/bin:$PATH"
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Make sure the second line has a carriage return after it. The shell doesn't like it otherwise. Log out and back in again and use the command: 
which java
You should see something like this: 
/usr/local/jdk1.6.0_02/bin/java
This indicates you will be using the Java we specified above. If you see something like this: 
/usr/bin/java
you are using the Debian default Java. Bash shell users should adjust their .bash_profile or other various files with similar commands.

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