aimtiaz11/readme.md

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Switching Java versions and runtimes using update-alternatives

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Switching Java using update-alternatives

Registering new java version

For example registering GraalVM to update-alternatives.

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/graalvm-jdk-21.0.4+8.1/bin/java 1
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/graalvm-jdk-21.0.4+8.1/bin/javac 1

List Java versions

update-alternatives --list java

Switch between java version

update-alternatives --config java

Alternative, set these handy aliases to switch versions easily:

alias graalvm21='export JAVA_HOME=/usr/lib/jvm/graalvm-jdk-21.0.4+8.1 && sudo update-alternatives --set java $JAVA_HOME/bin/java'
alias java17='export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 && sudo update-alternatives --set java $JAVA_HOME/bin/java'
alias java21='export JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64 && sudo update-alternatives --set java $JAVA_HOME/bin/java'

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