122 lines
4.0 KiB
Java
122 lines
4.0 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.catalina.loader;
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import java.io.IOException;
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import java.util.Timer;
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import java.util.TimerTask;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.junit.Assert;
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import org.junit.Test;
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import org.apache.catalina.Context;
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import org.apache.catalina.core.StandardContext;
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import org.apache.catalina.startup.Tomcat;
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import org.apache.catalina.startup.TomcatBaseTest;
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public class TestWebappClassLoaderMemoryLeak extends TomcatBaseTest {
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@Test
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public void testTimerThreadLeak() throws Exception {
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Tomcat tomcat = getTomcatInstance();
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// No file system docBase required
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Context ctx = tomcat.addContext("", null);
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if (ctx instanceof StandardContext) {
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((StandardContext) ctx).setClearReferencesStopTimerThreads(true);
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}
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Tomcat.addServlet(ctx, "taskServlet", new TaskServlet());
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ctx.addServletMappingDecoded("/", "taskServlet");
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tomcat.start();
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// This will trigger the timer & thread creation
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getUrl("http://localhost:" + getPort() + "/");
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// Stop the context
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ctx.stop();
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Thread[] threads = getThreads();
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for (Thread thread : threads) {
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if (thread != null && thread.isAlive() &&
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TaskServlet.TIMER_THREAD_NAME.equals(thread.getName())) {
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thread.join(5000);
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if (thread.isAlive()) {
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Assert.fail("Timer thread still running");
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}
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}
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}
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}
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/*
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* Get the set of current threads as an array.
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* Copied from WebappClassLoaderBase
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*/
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private Thread[] getThreads() {
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// Get the current thread group
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ThreadGroup tg = Thread.currentThread( ).getThreadGroup( );
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// Find the root thread group
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while (tg.getParent() != null) {
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tg = tg.getParent();
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}
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int threadCountGuess = tg.activeCount() + 50;
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Thread[] threads = new Thread[threadCountGuess];
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int threadCountActual = tg.enumerate(threads);
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// Make sure we don't miss any threads
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while (threadCountActual == threadCountGuess) {
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threadCountGuess *=2;
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threads = new Thread[threadCountGuess];
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// Note tg.enumerate(Thread[]) silently ignores any threads that
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// can't fit into the array
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threadCountActual = tg.enumerate(threads);
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}
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return threads;
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}
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private static final class TaskServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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private static final String TIMER_THREAD_NAME = "leaked-thread";
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp)
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throws ServletException, IOException {
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Timer timer = new Timer(TIMER_THREAD_NAME);
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timer.schedule(new LocalTask(), 0, 10000);
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}
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}
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private static final class LocalTask extends TimerTask {
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@Override
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public void run() {
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// Doesn't actually need to do anything.
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}
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}
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}
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