Apr 8, 2018

Switch Java version in Ubuntu

Use update-alternative command to change the default Java version:
$ sudo update-alternatives --config javac
There are 2 choices for the alternative javac (providing /usr/bin/javac).
  Selection    Path                                         Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-7-openjdk-amd64/bin/javac   ...
  1            /usr/lib/jvm/java-7-openjdk-amd64/bin/javac   ...
  2            /usr/lib/jvm/java-8-openjdk-amd64/bin/javac   ...
Press enter to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/bin/javac to provide /usr/bin/javac (javac) in manual mode

$ sudo update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).
  Selection    Path                                            Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   ...
  1            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   ...
  2            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   ...
Press enter to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java to provide /usr/bin/java (java) in manual mode