update-alternatives --config java

There are 3 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-13-openjdk-amd64/bin/java      1211      auto mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      manual mode
  2            /usr/lib/jvm/java-13-openjdk-amd64/bin/java      1211      manual mode
  3            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode

/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java -jar WhiteboxGIS.jar