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Java in rtx

The following are instructions for using the java rtx core plugin. This is used when there isn't a git plugin installed named "java".

If you want to use asdf-java or rtx-java then use rtx plugins install java GIT_URL.

The code for this is inside the rtx repository at ./src/plugins/core/java.rs.

Usage

The following installs the latest version of java-openjdk-17.x (if some version of openjdk-17.x is not already installed) and makes it the global default:

$ rtx use -g java@openjdk-17
$ rtx use -g java@17         # alternate shorthands for openjdk-only

See available versions with rtx ls-remote java.

macOS JAVA_HOME Integration

Some applications in macOS rely on /usr/libexec/java_home to find installed Java runtimes.

To integrate an installed Java runtime with macOS run the following commands for the proper version (e.g. openjdk-20).

$ sudo mkdir /Library/Java/JavaVirtualMachines/openjdk-20.jdk
$ sudo ln -s ~/.local/share/rtx/installs/java/openjdk-20/Contents /Library/Java/JavaVirtualMachines/openjdk-20.jdk/Contents

The distribution from Azul Systems does support the integration but the symlink target location will differ from the example above (e.g ~/.local/share/rtx/installs/java/zulu-11.64.190/zulu-11.jdk/Contents).

Note: Not all distributions of the Java SDK support this integration (e.g liberica).