19.2. Configure the Default JDK on Red Hat Enterprise Linux
It is possible to have multiple Java Development Kits (JDKs) installed on your Red Hat Enterprise Linux system. This task shows you how to specify which one your current environment uses. It uses the
In order to complete this task, you need to have superuser access, either through direct login or by means of the
Determine the paths for your preferred
javacbinaries.You can use the command
rpm -ql packagename |grep binto find the locations of binaries installed from RPMs. The default locations of the
javacbinaries on Red Hat Enterprise Linux 32-bit systems are as follows.
Table 19.1. Default locations for
JDK Path OpenJDK 1.6
Oracle JDK 1.6
Set the alternative you wish to use for each.Run the following commands to set your system to use a specific
/usr/sbin/alternatives --config javaor
/usr/sbin/alternatives --config javac. Follow the on-screen instructions.
Optional: Set the
java_sdk_1.6.0alternative choice.If you want to use Oracle JDK, you need to set the alternative for
java_sdk_1.6.0.as well. Use the following command:
/usr/sbin/alternatives --config java_sdk_1.6.0. The correct path is usually
/usr/lib/jvm/java-1.6.0-sun. You can do a file listing to verify it.
The alternative JDK is selected and active.