alternatives-and-java-versions

alternatives and java versions ##################################

This post discusses the alternatives utility by showing how to maintain multiple java versions side-by-side.

My os is fedora 18 x64 but I need java 32bit so I installed it from official oracle site.

.. code-block:: console

which java /usr/bin/java

# display sudo alternatives –display java

# alternatives –install sudo alternatives –install /usr/bin/java java /usr/java/latest/bin/java 15

# configure java to use newly installed version sudo alternatives –config java

There are 2 programs which provide 'java'.

  Selection    Command
  -----------------------------------------------
  *  1           /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
   + 2           /usr/java/latest/bin/java

  Enter to keep the current selection[+], or type selection number: 2

# display sudo alternatives –display java