By default your Fedora Linux system comes with a OpenJDK Java fetched from a standard Fedora repository. You may have some reasons to switch from OpenJDK to Oracle Java JRE. In order to achieve this firs download a java binary form oracle website:

as a root user make jre binary executable:

# chmod +x jre-6u23-linux-i586.bin

and execute the binary with:

# ./jre-6u23-linux-i586.bin

Switch over from OpenJDK to Oracle JRE: The above command extracted all content of jre-6u23-linux-i586.bin into a directory jre1.6.0_23. Move this directory to /opt/

# mv jre1.6.0_23/ /opt/

use alternative command to make oracle java JRE a default java environment:

alternatives --install /usr/bin/java java /opt/jre1.6.0_23/bin/java 20000

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