[jira] [Created] (IGNITE-8547) Deserialization of Enum values as anonymous classes may cause deadlock

["Ilya Kasnacheev (JIRA)" <ji...@apache.org>]

Ilya Kasnacheev created IGNITE-8547:
---------------------------------------

             Summary: Deserialization of Enum values as anonymous classes may cause deadlock
                 Key: IGNITE-8547
                 URL: https://issues.apache.org/jira/browse/IGNITE-8547
             Project: Ignite
          Issue Type: Bug
    Affects Versions: 1.9
            Reporter: Ilya Kasnacheev


Due to the following problem:
{code}
package jvmtest;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;

public class LegTypeTest {
	public static void main(String[] args) throws InterruptedException, BrokenBarrierException {
	    List<Thread> threadList = new ArrayList<>();

        CyclicBarrier b1 = new CyclicBarrier(16);
        CyclicBarrier b2 = new CyclicBarrier(17);

	    for (int i = 0; i < 16; i++) {
	        final int ii = i;
	        Thread thread = new Thread(() -> {
                try {
                    b1.await();

                    if (ii % 2 == 0)
                        Class.forName("jvmtest.LegTypeTest$E$1");

                    if (ii % 2 == 1)
                        Class.forName("jvmtest.LegTypeTest$E");

                    b2.await();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });
	        thread.start();
	        threadList.add(thread);
        }

        b2.await();

        for (Thread thread : threadList) {
	        thread.join();
        }
    }

    private enum E {
        A("A"),
        B("B") {
            @Override
            public String virtual() {
                return null;
            }
        };

        private String displayString;

        E(String displayString) {
            this.displayString = displayString;
        }

        public String virtual() {
            return displayString;
        }
    }
}
{code}
When doing Class.forName on different enum values deadlock can be caused. And that's exactly what OptimizedMarshaller does.

See also the attached test.



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