How do I set JVM options for GradleWorkerMain?

When I set GRADLE_OPTS or JAVA_OPTS, these are set for GradleWrapperMain when I run ./gradlew build for my project. But I need them to be set for GradleWorkerMain as well.

How do I do that?

Here’s the ps listing when that Gradle job is running in Bamboo. My JAVA_OPTS (such as -Dcool.opt=1) is missing from GradleWorkerMain.

53854 ? Sl 2:13 /home/apps/jdk7/bin/java -Dorg.gradle.daemon=false -Dcool.opt=1 -Xms1g -Xmx8g -XX:PermSize=256m -XX:MaxPermSize=768m -Djava.security.egd=file:/dev/./urandom -Dorg.gradle.appname=gradlew -classpath /path/to/gradle/wrapper/gradle-wrapper.jar org.gradle.wrapper.GradleWrapperMain build
54272 ? Sl 0:19 /home/apps/jdk1.7.0_45/bin/java -Dfile.encoding=ISO-8859-1 -cp /path/to/lots/of/jars.jar org.gradle.process.internal.launcher.GradleWorkerMain

Answer

There is no direct way to set JVM options for a GradleWorkerMain process. Most (but not all) task types that fork new workers implement JavaForkOptions, so you could try:

tasks.withType(JavaForkOptions) {
    systemProperty "cool.opt", "1"
    jvmArgs "someArg"
}

Task types that don’t implement JavaForkOptions typically allow to set fork options in some other way. For example:

tasks.withType(JavaCompile) {
    options.fork = true // otherwise won't fork
    options.forkOptions.jvmArgs = ["-Dcool.opt=1"]
}