Gradle JavaExec Challenge how to use allJvmArgs property

As per Java Exec allJvmArgs javadoc property, allJvmArgs

List<String> allJvmArgs

The full set of arguments to use to launch the JVM for the process. This includes arguments to define system properties, the minimum/maximum heap size, and the bootstrap classpath.

      

        
        
        
      

    

I am trying to use this property unsuccessfully. Below are my estimates.

Sample Java code. // src / core / java / com / examples

package com.examples;

public class AllJvmArgumentsInJavaExecBug {

    public static void main(String[] args) {
        System.out.println("Hello From Java");
    }

}


// File: build.gradle
apply plugin: 'java'

task(runJavaExecNormal, dependsOn: 'classes', type: JavaExec) {
    main = 'com.examples.AllJvmArgumentsInJavaExecBug'
    classpath = sourceSets.main.runtimeClasspath

}


task(runJavaExecArgumentSetExample1, dependsOn: 'classes', type: JavaExec) {
    main = 'com.examples.AllJvmArgumentsInJavaExecBug'
    classpath = sourceSets.main.runtimeClasspath
    allJvmArgs = [ '-Xms10240m', '-Xmx20280m']

}

task(runJavaExecArgumentSetExample2, dependsOn: 'classes', type: JavaExec) {
    main = 'com.examples.AllJvmArgumentsInJavaExecBug'
    classpath = sourceSets.main.runtimeClasspath

    List<String> argumentList = new ArrayList<String>();
    argumentList.add('-Xms10240m')
    argumentList.add('-Xmx20280m')
    allJvmArgs = argumentList
}

      

        
        
        
      

    

I am getting the following error.

P:\github\gradleJavaExecAllJvmArgs>gradle

FAILURE: Build failed with an exception.

* Where:
Build file 'P:\github\gradleJavaExecAllJvmArgs\build.gradle' line: 14

* What went wrong:
A problem occurred evaluating root project 'gradleJavaExecAllJvmArgs'.
> java.lang.UnsupportedOperationException (no error message)

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 3.733 secs

      

        
        
        
      

    

I cannot use this property. I can use maxHeapSize = "2g" as stated in this question . I would like to use it to set the heap size to the minimum amount.

Below is a github project that recreates this situation.