Gradle does not honor --add-modules jvm argument in JDK9

Question

I am trying JDK9 (9-ea+143), and need to set --add-modules java.xml.bind. I have tried:

• Setting GRADLE_OPTS="--add-modules java.xml.bind '-Dorg.gradle.jvmargs=--add-modules java.xml.bind'"
• Setting org.gradle.jvmargs=--add-modules java.xml.bind in gradle.properties.
• Adding test { jvmArgs '--add-modules java.xml.bind' } to build.gradle
• Adding tasks.withType(Test) { jvmArgs '--add-modules java.xml.bind' } to build.gradle
• Adding tasks.withType(JavaExec) { jvmArgs '--add-modules java.xml.bind' } to build.gradle

Tests still fail. What am I missing?

I have an example project in https://github.com/henrik242/gradle-jdk9-test-problem

✨  ./gradlew build
:compileJava
/foo/gradle-jdk9-test-problem/src/main/java/SomeClass.java:1: error: package javax.xml.bind does not exist
import javax.xml.bind.ValidationException;
                     ^
/foo/gradle-jdk9-test-problem/src/main/java/SomeClass.java:5: error: cannot find symbol
  public void doStuff() throws ValidationException {
                               ^
  symbol:   class ValidationException
  location: class SomeClass
/foo/gradle-jdk9-test-problem/src/main/java/SomeClass.java:6: error: cannot find symbol
    throw new ValidationException("msg");
              ^
  symbol:   class ValidationException
  location: class SomeClass
3 errors
:compileJava FAILED

Answer 1

It works when adding the following to build.gradle:

compileJava {
  options.compilerArgs += ["--add-modules", "java.xml.bind"]
}

compileTestJava {
  options.compilerArgs += ["--add-modules", "java.xml.bind"]
}

test {
  jvmArgs += ["--add-modules", "java.xml.bind"]
}

Is there an easier way?

EDIT: This also works:

tasks.withType(AbstractCompile) {
  options.compilerArgs += ["--add-modules", "java.xml.bind"]
}

tasks.withType(Test) {
  jvmArgs += ["--add-modules", "java.xml.bind"]
}