A DESCRIPTION OF THE PROBLEM :
The JavaDoc for Executor.execute indicates "NullPointerException – if command is null". But in the testcase it doesn't throw NPE immediately, but throws NPE later in internal thread:

Exception in thread "pool-1-thread-1" java.lang.NullPointerException: Cannot invoke "java.lang.Runnable.run()" because "this.val$task" is null
at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:108)

REGRESSION : Last worked in version 24.0.2


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import java.nio.channels.AsynchronousChannelGroup;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;

public class ExecutorTest {

    public static void main(String[] args) throws Exception {
        // create channel groups
        ThreadFactory factory = Executors.defaultThreadFactory();
        AsynchronousChannelGroup executor = AsynchronousChannelGroup
            .withThreadPool(Executors.newFixedThreadPool(10, factory));

        try {
            ((Executor)executor).execute(null);
            throw new RuntimeException("NullPointerException not thrown for null task in group: " + executor);
        } catch (NullPointerException expected) {
            // Expected behavior
        }
        executor.shutdown();
        if (!executor.awaitTermination(5, TimeUnit.SECONDS)) {
            System.err.println("WARNING: " + executor + " not terminated after final shutdown attempt");
        }

    }



}

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