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1.4. Setting up Java

Sun and OpenJDK Java are supported.

Note

The server requires the JDK, while the agent only requires the JRE.

1.4.1. Setting up the JDK for the JBoss ON Server

After downloading and installing the latest Java, configure the system to use that version of Java. For example, to configure the JDK for the server on Red Hat Enterprise Linux:
  1. Set the JAVA_HOME environment variable to the installation directory.
    1. Open the .bashrc for the system user that will run JBoss ON. For example: 
      vim /home/jon/.bashrc
    2. Add a line to set the JAVA_HOME environment variable to the specific JDK directory. For example: 
      export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/
  2. Set the system to use the correct version of the JDK using the system alternatives command. The selected version has the *+ symbols by it. 
    /usr/sbin/alternatives --config javac

There are 2 programs which provide 'javac'.

  Selection    Command
-----------------------------------------------
   1           /usr/lib/jvm/java-1.6.0-bea/bin/javac
*+ 2           /usr/lib/jvm/java-1.6.0-openjdk/bin/javac

Enter to keep the current selection[+], or type selection number:

1.4.2. Setting up the JRE for the JBoss ON Agent

  1. Set the JAVA_HOME environment variable to the installation directory.
    1. Open the .bashrc for the system user that will run JBoss ON. For example: 
      vim /home/jon/.bashrc
    2. Add a line to set the JAVA_HOME environment variable to the specific JRE directory. For example: 
      export JAVA_HOME=/usr/lib/jvm/jre-1.6.0-openjdk/bin/java/
  2. Set the system to use the correct version of the JRE using the system alternatives command. The selected version has the *+ symbols by it. 
    /usr/sbin/alternatives --config java 

There are 5 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
   1           /usr/lib/jvm/jre-1.5.0-sun/bin/java
   2           /usr/lib/jvm/jre-1.4.2-gcj/bin/java
   3           /usr/lib/jvm/jre-1.6.0-sun/bin/java
*+ 4           /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
   5           /usr/lib/jvm/jre-1.6.0-bea/bin/java

Enter to keep the current selection[+], or type selection number: