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Tuesday 9 September 2014

Switching between installed Java versions in ubuntu


Switching between installed Java versions can be accomplished using the update alternatives command.

  •     To get a list of your installed Java platforms, run the following command from the terminal:

    sudo update-alternatives --config java
 
  This will give you a list output similar to this:
    There are 2 choices for the alternative java (providing /usr/bin/java).
       Selection    Path                                           Priority   Status
      ------------------------------------------------------------
      0            /usr/lib/jvm/java-6-oracle/jre/bin/java         1070      auto mode
      1            /usr/lib/jvm/java-7-openjdk-i386/jre/bin/java   1051      manual mode
    * 2            /usr/lib/jvm/java-6-openjdk-i386/jre/bin/java   1069      manual mode
    Press enter to keep the current choice[*], or type selection number:

In this case, the Open JDK 6 version is running. To switch to the Open JDK version 7, you would select option 1 at the prompt and press the Enter key.

You will now be running the OpenJDK 7 version. No other changes will be needed to switch your Java versions.
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