lucene/help/jvms.txt

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Compiling and testing against different JVMs
============================================
By default tests are executed with the same Java Gradle is using internally.
To run tests against a different Java version, define a property called
"runtime.java.home" or define an environment variable "RUNTIME_JAVA_HOME"
pointing at the JDK installation folder.
If property is being used, it can be a system property (-D...) or a project
property (-P...).
Example:
gradlew test -p lucene/test-framework --tests TestJvmInfo -Dtests.verbose=true -Druntime.java.home=/jvms/jdk14
Note that an alternative JVM can also be made the "default" setting
by adding it to (project-local) gradle.properties.