Java is a programming language and runtime environment. You can use Zero Install to:

• Get Java development tools and SDKs
• Run apps that need Java as a dependency

To get the traditional Java commands: 0install add java https://apps.0install.net/java/jre.xml 0install add javac https://apps.0install.net/java/jdk.xml

The other tools are available by passing the tool name as a --command option to 0install add, e.g.:

The JRE and JDK feeds automatically select an OpenJDK distribution based on your operating system:

• Eclipse Temurin JDK on Linux and macOS
• Microsoft JDK on Windows
• OpenJDK as a fallback

They can also use a Java version already installed by your Linux distribution's package manager (APT, DNF, Zypper or pacman) or registered in the Windows registry.

You can explicitly control which OpenJDK distribution is used by referencing the relevant feed directly.

To get common Java build tools: 0install add ant https://apps.0install.net/java/ant.xml 0install add mvn https://apps.0install.net/java/maven.xml 0install add gradle https://apps.0install.net/java/gradle.xml

To use the Java Runtime Environment as the runner in a feed:
<command name="run" path="myapp.jar"> <runner interface="https://apps.0install.net/java/jre.xml"> <arg>-jar</arg> </runner> </command>

If you wish to use the CLASSPATH variable to specify external dependencies in a feed you can use JAR Launcher:
<command name="run" path="myapp.jar"> <runner interface="https://apps.0install.net/java/jar-launcher.xml"/> </command> <environment name="CLASSPATH" insert="myapp.jar"/> <requires interface="http://example.com/mylib.xml"> <environment name="CLASSPATH" insert="mylib.jar"/> </requires>