How do I properly add --add-opens to jvmArgs in JavaExec task

Question

Currently I have a task that executes to run the program, something like

task runApp(type: JavaExec) {
    classpath = sourceSets.main.runtimeClasspath

    main = 'com.eonmux.somepackage'

    jvmArgs '-Xmx4096m'
}

I'm trying to add --add-opens to the list of JVM args so that I can allow reflection access from my gradle packages

Something like

task runApp(type: JavaExec) {
    classpath = sourceSets.main.runtimeClasspath

    main = 'com.eonmux.somepackage'

    jvmArgs '-Xmx4096m','--add-opens java.base/jdk.internal.loader=ALL-UNNAMED'
}

However this gives the following error saying that the command line option is unrecognized

2020-12-09T16:30:56.285-0500 [INFO] [org.gradle.process.internal.DefaultExecHandle] Successfully started process 'command 'C:\Program Files\AdoptOpenJDK\jdk-11.0.6.10-openj9\bin\java.exe''
2020-12-09T16:30:56.286-0500 [DEBUG] [org.gradle.process.internal.ExecHandleRunner] waiting until streams are handled...
2020-12-09T16:30:56.360-0500 [ERROR] [system.err] JVMJ9VM007E Command-line option unrecognised: --add-opens java.base/jdk.internal.loader=ALL-UNNAMED
2020-12-09T16:30:56.361-0500 [ERROR] [system.err] Error: Could not create the Java Virtual Machine.
Could not create the Java Virtual Machine.

2020-12-09T16:30:56.362-0500 [ERROR] [system.err] Error: A fatal exception has occurred. Program will exit.
A fatal exception has occurred. Program will exit.

Which is strange because when I open up a command line to the Java path indicated, and run

C:\Program Files\AdoptOpenJDK\jdk-11.0.6.10-openj9\bin>java --add-opens

I get the following message confirming its existence

Error: --add-opens requires modules to be specified

I'm no Gradle configuration expert, so I'd appreciate some help.

This is on Windows 10x64 with the IntelliJ IDE and Gradle 6.0.1

Davis

You probably need to pass both as separate strings, not one ('--add-opens', 'java.base/jdk.internal.loader=ALL-UNNAMED'). I think it should also work if you replace the space in the argument string with an = – District

@JornVernee Your suggestions both worked, sorry I misread your comment earlier. Cheers. – Davis

Answer 1

This question was answered in a comment by Jorn Vernee (no relation to me despite the similar name), so I will duplicate it here:

You probably need to pass both as separate strings, not one ('--add-opens', 'java.base/jdk.internal.loader=ALL-UNNAMED'). I think it should also work if you replace the space in the argument string with an =.

Colier