Java JDK11，安全策略不’；无法传播到ForkJoinPool工作线程

在两个不同的JDK版本（8和11）上运行，VM参数为：-Djava.security.policy=C:\test\u system.policy

测试系统策略内容：

public class S3ButcketTest
{

public static void main(String args[])
{
    System.setSecurityManager(new RMISecurityManager());
    ForkJoinPool pool = new ForkJoinPool(1);
    System.out.println("main: "+Policy.getPolicy());

    pool.execute(new Runnable()
    {
        @Override
        public void run()
        {
            try
            {
                Thread.sleep(1000);
            }
            catch (InterruptedException e)
            {
                e.printStackTrace();
            }
            System.out.println("pool: "+Policy.getPolicy());
        }
    });

    pool.shutdown();
    try
    {
        pool.awaitTermination(1000, TimeUnit.SECONDS);
    }
    catch (InterruptedException e)
    {
        e.printStackTrace();
    }
}
}

使用JDK11运行时的输出：

grant {
permission java.security.AllPermission;
};

使用JDK8运行时的输出：

main: sun.security.provider.PolicyFile@4cb2c100
Exception in thread "ForkJoinPool-1-worker-3" java.security.AccessControlException: access denied ("java.security.SecurityPermission" "getPolicy")
at java.base/java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
at java.base/java.security.AccessController.checkPermission(AccessController.java:895)
at java.base/java.lang.SecurityManager.checkPermission(SecurityManager.java:322)
at java.base/java.security.Policy.getPolicy(Policy.java:159)
at S3ButcketTest$1.run(S3ButcketTest.java:30)
at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1426)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

---

我们将JDK从8升级到11，突然间我们面临这个问题。为什么会发生这种情况，有什么解释吗？有解决方案吗？

不是解决方案，但我正在调试一个类似的问题。在JDK 8中运行良好的测试在JDK 11中失败。存在拒绝访问错误，这表明线程根本没有任何权限。JDK8中有一个解释行为变化的例子。

main: sun.security.provider.PolicyFile@1b84c92
pool: sun.security.provider.PolicyFile@1b84c92