Wednesday, 21 January 2015

Switching between Java versions on a Mac


I just installed JDK 1.8 and had a problem:
  1. I could not figure out where JAVA_HOME was configured
  2. I wanted an easy way to switch between versions
After a bit of Google searching I learned about:
The above article explains:


  • /usr/libexec/java_home 

  • displays the current Java version in use


  • /usr/libexec/java_home -V

  • displays all current Java versions available


  • /usr/libexec/java_home -v1.6

  • displays the path for the specific version

  • And in the above article, I found a comment describing aliases.

    I added the following aliases into my .profile

    alias java6="export JAVA_HOME=`/usr/libexec/java_home -v1.6`"
    alias java7="export JAVA_HOME=`/usr/libexec/java_home -v1.7`"
    alias java8="export JAVA_HOME=`/usr/libexec/java_home -v1.8`"

    After executing "source .profile" the aliases became active.

    And now I can easily switch between the various versions of Java.

    Notes:

    • Do not add spaces in the alias between 'java6 = "export' or your alias won't work
    • Other options are listed at mike.mainguy
    • Steve Bennett suggested jenv.be as another alternative