Check Java Runtime Environment

Set environment variable JAVA_HOME if you install JDK5.0 or set environment variable JRE_HOME if you install JRE5.0.
In Windows system, type in command line:
   “%JAVA_HOME%\jre\bin\java –version”
or
   “%JRE_HOME%\bin\java -version”
You should see the version of JDK/JRE you install, as shown below:

 

In Unix/Linux system, type in command line:
   "$JAVA_HOME/jre/bin/java -version"

or
  "$JRE_HOME/bin/java -version"
You should see the version of JDK/JRE you install, as shown below: 

 

 

If you see similar response as in the figures above, the JAVA_HOME/JRE_HOME has been correctly setup.