a-foundation-benchmark/src/main/java/com/ajjpj/afoundation/concurrent/jdk/j9new/ForkJoinPool.java
public <T> ForkJoinTask<T> submit(ForkJoinTask<T> task) {
        if (task == null)
            throw new NullPointerException();
        externalPush(task);
        return task;
    }
public <T> ForkJoinTask<T> submit(ForkJoinTask<T> task) {
        if (task == null)
            throw new NullPointerException();
        externalPush(task);
        return task;
    }
Submits a ForkJoinTask for execution.

@param task the task to submit
@param <T> the type of the task's result
@return the task
@throws NullPointerException if the task is null
@throws RejectedExecutionException if the task cannot be
scheduled for execution