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Run sudo update-java-alternatives --list to list off all the Java installations on a machine by name and directory,and then run sudo update-java-alternatives --set [JDK/JRE name e.g. java-8-oracle] to choose which JRE/JDK to use. If you want to use different JDKs/JREs for each Java task,you can run update-alternatives to configure one java executable at a time; you can run sudo update-alternatives --config java[Tab] to see the Java commands that can be configured (java,javac,javah,javaws,etc). And then sudo update-alternatives --config [javac|java|javadoc|etc.] will associate that Java task/command to a particular JDK/JRE. You may also need to set JAVA_HOME for some applications: from this answer you can use export JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:bin/java::") for JREs,or export JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:jre/bin/java::") for JDKs. |
