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A nice way to store all the java-settings is to add the file java.sh to /etc/profile.d
Place all the java-settings such as JAVA_HOME, J2EE_HOME, CATALINA_HOME and so on in this file and after making this file executable (chmod +x java.sh), all the settings will be available to all the users on this machine
My java.sh contains:
To my knowledge, the JAVA_HOME variable is used by all kinds of Java-software that needs a Java runtime environment such as Open Office or the Eclipse development tool.
The first versions of Tomcat needed the CATALINA_HOME setting. I don't know if this setting is still mandatory but I still maintain it.
Ant is a make-utility