/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package classloading;
import java.util.Random;
/**
* This is a demo application which can cause a classloader leakage via {@link ThreadLocal}.
*
* It is adapted from original Hazelcast code which created a {@link ThreadLocal} leakage.
*/
public final class LeakingApplication {
public static void init(Boolean doCleanup) {
ThreadLocalRandom.localRandom.get();
if (doCleanup) {
cleanup();
}
}
public static void cleanup() {
ThreadLocalRandom.localRandom.remove();
}
private static class ThreadLocalRandom extends Random {
/**
* This causes a classloader leakage which may produce errors in web containers
* or even cause a PermGen Space OOME in Java 6 (since references are not cleaned up).
*
* Never override {@link ThreadLocal#initialValue()} in production code!
*/
private static final ThreadLocal<ThreadLocalRandom> localRandom =
new ThreadLocal<ThreadLocalRandom>() {
protected ThreadLocalRandom initialValue() {
return new ThreadLocalRandom();
}
};
}
}