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Commons Beanutils example source code file (MemoryLeakTestCase.java)
The Commons Beanutils MemoryLeakTestCase.java source code/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.apache.commons.beanutils.memoryleaktests; import java.lang.ref.SoftReference; import java.lang.ref.WeakReference; import java.net.MalformedURLException; import java.net.URL; import java.net.URLClassLoader; import java.util.Locale; import java.util.StringTokenizer; import junit.framework.TestCase; import org.apache.commons.beanutils.BeanUtilsBean; import org.apache.commons.beanutils.ConvertUtils; import org.apache.commons.beanutils.MappedPropertyDescriptor; import org.apache.commons.beanutils.MethodUtils; import org.apache.commons.beanutils.PropertyUtils; import org.apache.commons.beanutils.WrapDynaBean; import org.apache.commons.beanutils.WrapDynaClass; import org.apache.commons.beanutils.converters.IntegerConverter; import org.apache.commons.beanutils.locale.LocaleBeanUtilsBean; import org.apache.commons.beanutils.locale.LocaleConvertUtils; import org.apache.commons.beanutils.locale.converters.IntegerLocaleConverter; /** * Test BeanUtils memory leaks. * * See https://issues.apache.org/jira/browse/BEANUTILS-291 * * @author Clebert Suconic */ public class MemoryLeakTestCase extends TestCase { /** * Tests that PropertyUtilsBean's descriptorsCache doesn't cause a memory leak. */ public void testPropertyUtilsBean_descriptorsCache_memoryLeak() throws Exception { if (isPre15JVM()) { return; } // Clear All BeanUtils caches before the test clearAllBeanUtilsCaches(); String className = "org.apache.commons.beanutils.memoryleaktests.pojotests.SomePojo"; // The classLoader will go away only when these following variables are released ClassLoader loader = newClassLoader(); Class beanClass = loader.loadClass(className); Object bean = beanClass.newInstance(); // ----------------------------------------------------------------------------- WeakReference someRef = new WeakReference(loader); // Sanity checks only assertNotNull("ClassLoader is null", loader); assertNotNull("BeanClass is null", beanClass); assertNotSame("ClassLoaders should be different..", getClass().getClassLoader(), beanClass.getClassLoader()); assertSame("BeanClass ClassLoader incorrect", beanClass.getClassLoader(), loader); // if you comment the following line, the testcase will work, and the ClassLoader will be released. // That proves that nothing is wrong with the test, and PropertyUtils is holding a reference assertEquals("initialValue", PropertyUtils.getProperty(bean, "name")); // this should make the reference go away. loader = null; beanClass = null; bean = null; forceGarbageCollection(); /* Try to force the garbage collector to run by filling up memory */ if (someRef.get() != null) { profilerLeakReport("PropertyUtilsBean descriptorsCache", className); } // if everything is fine, this will be null assertNull("PropertyUtilsBean is holding a reference to the classLoader", someRef.get()); // Clear All BeanUtils caches after the test clearAllBeanUtilsCaches(); } /** * Tests that PropertyUtilsBean's mappedDescriptorsCache doesn't cause a memory leak. */ public void testPropertyUtilsBean_mappedDescriptorsCache_memoryLeak() throws Exception { if (isPre15JVM()) { return; } // Clear All BeanUtils caches before the test clearAllBeanUtilsCaches(); String className = "org.apache.commons.beanutils.memoryleaktests.pojotests.SomeMappedPojo"; // The classLoader will go away only when these following variables are released ClassLoader loader = newClassLoader(); Class beanClass = loader.loadClass(className); Object bean = beanClass.newInstance(); // ----------------------------------------------------------------------------- WeakReference someRef = new WeakReference(loader); // Sanity checks only assertNotNull("ClassLoader is null", loader); assertNotNull("BeanClass is null", beanClass); assertNotSame("ClassLoaders should be different..", getClass().getClassLoader(), beanClass.getClassLoader()); assertSame("BeanClass ClassLoader incorrect", beanClass.getClassLoader(), loader); // if you comment the following three lines, the testcase will work, and the ClassLoader will be released. // That proves that nothing is wrong with the test, and PropertyUtils is holding a reference assertEquals("Second Value", PropertyUtils.getProperty(bean, "mappedProperty(Second Key)")); PropertyUtils.setProperty(bean, "mappedProperty(Second Key)", "New Second Value"); assertEquals("New Second Value", PropertyUtils.getProperty(bean, "mappedProperty(Second Key)")); // this should make the reference go away. loader = null; beanClass = null; bean = null; // PropertyUtilsBean uses the MethodUtils's method cache for mapped properties. // Uncomment the following line to check this is not just a repeat of that memory leak. // MethodUtils.clearCache(); forceGarbageCollection(); /* Try to force the garbage collector to run by filling up memory */ if (someRef.get() != null) { profilerLeakReport("PropertyUtilsBean mappedDescriptorsCache", className); } // if everything is fine, this will be null assertNull("PropertyUtilsBean is holding a reference to the classLoader", someRef.get()); // Clear All BeanUtils caches after the test clearAllBeanUtilsCaches(); } /** * Tests that MappedPropertyDescriptor can re-create the Method reference after it * has been garbage collected. */ public void testMappedPropertyDescriptor_MappedMethodReference1() throws Exception { // Clear All BeanUtils caches before the test clearAllBeanUtilsCaches(); String className = "org.apache.commons.beanutils.memoryleaktests.pojotests.SomeMappedPojo"; ClassLoader loader = newClassLoader(); Class beanClass = loader.loadClass(className); Object bean = beanClass.newInstance(); // ----------------------------------------------------------------------------- // Sanity checks only assertNotNull("ClassLoader is null", loader); assertNotNull("BeanClass is null", beanClass); assertNotSame("ClassLoaders should be different..", getClass().getClassLoader(), beanClass.getClassLoader()); assertSame("BeanClass ClassLoader incorrect", beanClass.getClassLoader(), loader); MappedPropertyDescriptor descriptor = new MappedPropertyDescriptor("mappedProperty", beanClass); assertNotNull("1-Read Method null", descriptor.getMappedReadMethod()); assertNotNull("1-Write Method null", descriptor.getMappedWriteMethod()); assertEquals("1-Read Method name", "getMappedProperty", descriptor.getMappedReadMethod().getName()); assertEquals("1-Read Write name", "setMappedProperty", descriptor.getMappedWriteMethod().getName()); forceGarbageCollection(); /* Try to force the garbage collector to run by filling up memory */ // The aim of this test is to check the functinality in MappedPropertyDescriptor which // re-creates the Method references after they have been garbage collected. However theres no // way of knowing the method references were garbage collected and that code was run, except by // un-commeting the System.out statement in MappedPropertyDescriptor's MappedMethodReference's // get() method. assertNotNull("1-Read Method null", descriptor.getMappedReadMethod()); assertNotNull("1-Write Method null", descriptor.getMappedWriteMethod()); assertEquals("1-Read Method name", "getMappedProperty", descriptor.getMappedReadMethod().getName()); assertEquals("1-Read Write name", "setMappedProperty", descriptor.getMappedWriteMethod().getName()); // Clear All BeanUtils caches after the test clearAllBeanUtilsCaches(); } /** * Tests that MappedPropertyDescriptor can re-create the Method reference after it * has been garbage collected. */ public void testMappedPropertyDescriptor_MappedMethodReference2() throws Exception { // Clear All BeanUtils caches before the test clearAllBeanUtilsCaches(); String className = "org.apache.commons.beanutils.memoryleaktests.pojotests.SomeMappedPojo"; ClassLoader loader = newClassLoader(); Class beanClass = loader.loadClass(className); Object bean = beanClass.newInstance(); // ----------------------------------------------------------------------------- // Sanity checks only assertNotNull("ClassLoader is null", loader); assertNotNull("BeanClass is null", beanClass); assertNotSame("ClassLoaders should be different..", getClass().getClassLoader(), beanClass.getClassLoader()); assertSame("BeanClass ClassLoader incorrect", beanClass.getClassLoader(), loader); MappedPropertyDescriptor descriptor = new MappedPropertyDescriptor("mappedProperty", beanClass); assertNotNull("1-Read Method null", descriptor.getMappedReadMethod()); assertNotNull("1-Write Method null", descriptor.getMappedWriteMethod()); assertEquals("1-Read Method name", "getMappedProperty", descriptor.getMappedReadMethod().getName()); assertEquals("1-Read Write name", "setMappedProperty", descriptor.getMappedWriteMethod().getName()); // this should make the reference go away. loader = null; beanClass = null; bean = null; forceGarbageCollection(); /* Try to force the garbage collector to run by filling up memory */ // The aim of this test is to check the functinality in MappedPropertyDescriptor which // re-creates the Method references after they have been garbage collected. However theres no // way of knowing the method references were garbage collected and that code was run, except by // un-commeting the System.out statement in MappedPropertyDescriptor's MappedMethodReference's // get() method. assertNotNull("1-Read Method null", descriptor.getMappedReadMethod()); assertNotNull("1-Write Method null", descriptor.getMappedWriteMethod()); assertEquals("1-Read Method name", "getMappedProperty", descriptor.getMappedReadMethod().getName()); assertEquals("1-Read Write name", "setMappedProperty", descriptor.getMappedWriteMethod().getName()); // Clear All BeanUtils caches after the test clearAllBeanUtilsCaches(); } /** * Tests that MethodUtils's cache doesn't cause a memory leak. */ public void testMethodUtils_cache_memoryLeak() throws Exception { // Clear All BeanUtils caches before the test clearAllBeanUtilsCaches(); String className = "org.apache.commons.beanutils.memoryleaktests.pojotests.SomePojo"; // The classLoader will go away only when these following variables are released ClassLoader loader = newClassLoader(); Class beanClass = loader.loadClass(className); Object bean = beanClass.newInstance(); // ----------------------------------------------------------------------------- WeakReference someRef = new WeakReference(loader); // Sanity checks only assertNotNull("ClassLoader is null", loader); assertNotNull("BeanClass is null", beanClass); assertNotSame("ClassLoaders should be different..", getClass().getClassLoader(), beanClass.getClassLoader()); assertSame("BeanClass ClassLoader incorrect", beanClass.getClassLoader(), loader); // if you comment the following line, the testcase will work, and the ClassLoader will be released. // That proves that nothing is wrong with the test, and MethodUtils is holding a reference assertEquals("initialValue", MethodUtils.invokeExactMethod(bean, "getName", new Object[0])); // this should make the reference go away. loader = null; beanClass = null; bean = null; forceGarbageCollection(); /* Try to force the garbage collector to run by filling up memory */ if (someRef.get() != null) { profilerLeakReport("MethodUtils cache", className); } // if everything is fine, this will be null assertNull("MethodUtils is holding a reference to the classLoader", someRef.get()); // Clear All BeanUtils caches after the test clearAllBeanUtilsCaches(); } /** * Tests that WrapDynaClass's dynaClasses doesn't cause a memory leak. */ public void testWrapDynaClass_dynaClasses_memoryLeak() throws Exception { if (isPre15JVM()) { return; } // Clear All BeanUtils caches before the test clearAllBeanUtilsCaches(); String className = "org.apache.commons.beanutils.memoryleaktests.pojotests.SomePojo"; // The classLoader will go away only when these following variables are released ClassLoader loader = newClassLoader(); Class beanClass = loader.loadClass(className); Object bean = beanClass.newInstance(); WrapDynaBean wrapDynaBean = new WrapDynaBean(bean); // ----------------------------------------------------------------------------- WeakReference someRef = new WeakReference(loader); // Sanity checks only assertNotNull("ClassLoader is null", loader); assertNotNull("BeanClass is null", beanClass); assertNotSame("ClassLoaders should be different..", getClass().getClassLoader(), beanClass.getClassLoader()); assertSame("BeanClass ClassLoader incorrect", beanClass.getClassLoader(), loader); // if you comment the following line, the testcase will work, and the ClassLoader will be released. // That proves that nothing is wrong with the test, and WrapDynaClass is holding a reference assertEquals("initialValue", wrapDynaBean.get("name")); // this should make the reference go away. loader = null; beanClass = null; bean = null; wrapDynaBean = null; // Wrap Dyna Class uses the PropertyUtilsBean's decriptor caches. // Uncomment the following line to check this is not just a repeat of that memory leak. // BeanUtilsBean.getInstance().getPropertyUtils().clearDescriptors(); forceGarbageCollection(); /* Try to force the garbage collector to run by filling up memory */ if (someRef.get() != null) { profilerLeakReport("WrapDynaClass dynaClasses", className); } // if everything is fine, this will be null assertNull("WrapDynaClass is holding a reference to the classLoader", someRef.get()); // Clear All BeanUtils caches after the test clearAllBeanUtilsCaches(); } /** * Tests that ConvertUtilsBean's converters doesn't cause a memory leak. */ public void testConvertUtilsBean_converters_memoryLeak() throws Exception { // Clear All BeanUtils caches before the test clearAllBeanUtilsCaches(); String className = "org.apache.commons.beanutils.memoryleaktests.pojotests.CustomInteger"; // The classLoader will go away only when these following variables are released ClassLoader loader = newClassLoader(); Class beanClass = loader.loadClass(className); Object bean = beanClass.newInstance(); // ----------------------------------------------------------------------------- WeakReference someRef = new WeakReference(loader); // Sanity checks only assertNotNull("ClassLoader is null", loader); assertNotNull("BeanClass is null", beanClass); assertNotSame("ClassLoaders should be different..", getClass().getClassLoader(), beanClass.getClassLoader()); assertSame("BeanClass ClassLoader incorrect", beanClass.getClassLoader(), loader); // if you comment the following two lines, the testcase will work, and the ClassLoader will be released. // That proves that nothing is wrong with the test, and ConvertUtilsBean is holding a reference ConvertUtils.register(new IntegerConverter(), beanClass); assertEquals("12345", ConvertUtils.convert(bean, String.class)); // this should make the reference go away. loader = null; beanClass = null; bean = null; forceGarbageCollection(); /* Try to force the garbage collector to run by filling up memory */ if (someRef.get() != null) { profilerLeakReport("ConvertUtilsBean converters", className); } // if everything is fine, this will be null assertNull("ConvertUtilsBean is holding a reference to the classLoader", someRef.get()); // Clear All BeanUtils caches after the test clearAllBeanUtilsCaches(); } /** * Tests that LocaleConvertUtilsBean's converters doesn't cause a memory leak. */ public void testLocaleConvertUtilsBean_converters_memoryLeak() throws Exception { // Clear All BeanUtils caches before the test clearAllBeanUtilsCaches(); String className = "org.apache.commons.beanutils.memoryleaktests.pojotests.CustomInteger"; // The classLoader will go away only when these following variables are released ClassLoader loader = newClassLoader(); Class beanClass = loader.loadClass(className); Object bean = beanClass.newInstance(); // ----------------------------------------------------------------------------- WeakReference someRef = new WeakReference(loader); // Sanity checks only assertNotNull("ClassLoader is null", loader); assertNotNull("BeanClass is null", beanClass); assertNotSame("ClassLoaders should be different..", getClass().getClassLoader(), beanClass.getClassLoader()); assertSame("BeanClass ClassLoader incorrect", beanClass.getClassLoader(), loader); // if you comment the following two lines, the testcase will work, and the ClassLoader will be released. // That proves that nothing is wrong with the test, and LocaleConvertUtilsBean is holding a reference LocaleConvertUtils.register(new IntegerLocaleConverter(Locale.US, false), beanClass, Locale.US); assertEquals(new Integer(12345), LocaleConvertUtils.convert(bean.toString(), beanClass, Locale.US, "#,###")); // this should make the reference go away. loader = null; beanClass = null; bean = null; forceGarbageCollection(); /* Try to force the garbage collector to run by filling up memory */ if (someRef.get() != null) { profilerLeakReport("LocaleConvertUtilsBean converters", className); } // if everything is fine, this will be null assertNull("LocaleConvertUtilsBean is holding a reference to the classLoader", someRef.get()); // Clear All BeanUtils caches after the test clearAllBeanUtilsCaches(); } /** * Clear all the BeanUtils Caches manually. * * This is probably overkill, but since we're dealing with static caches * it seems sensible to ensure that all test cases start with a clean sheet. */ private void clearAllBeanUtilsCaches() { // Clear BeanUtilsBean's PropertyUtilsBean descriptor caches BeanUtilsBean.getInstance().getPropertyUtils().clearDescriptors(); // Clear LocaleBeanUtilsBean's PropertyUtilsBean descriptor caches LocaleBeanUtilsBean.getInstance().getPropertyUtils().clearDescriptors(); // Clear MethodUtils's method cache MethodUtils.clearCache(); // Clear WrapDynaClass cache WrapDynaClass.clear(); // replace the existing BeanUtilsBean instance for the current class loader with a new, clean instance BeanUtilsBean.setInstance(new BeanUtilsBean()); // replace the existing LocaleBeanUtilsBean instance for the current class loader with a new, clean instance LocaleBeanUtilsBean.setInstance(new LocaleBeanUtilsBean()); } /** * Try to force the garbage collector to run by filling up memory and calling System.gc(). */ private void forceGarbageCollection() throws Exception { // Fill up memory SoftReference ref = new SoftReference(new Object()); int count = 0; while(ref.get() != null && count++ < 5) { java.util.ArrayList list = new java.util.ArrayList(); try { long i = 0; while (true && ref.get() != null) { list.add("A Big String A Big String A Big String A Big String A Big String A Big String A Big String A Big String A Big String A Big String " + (i++)); } } catch (Throwable ignored) { } list.clear(); list = null; // System.out.println("Count " + count + " : " + getMemoryStats()); System.gc(); Thread.sleep(1000); } // System.out.println("After GC: " + getMemoryStats()); if (ref.get() != null) { throw new IllegalStateException("Your JVM is not releasing SoftReference, try running the testcase with less memory (-Xmx)"); } } /** * Create a new class loader instance. */ private static URLClassLoader newClassLoader() throws MalformedURLException { String dataFilePath = MemoryLeakTestCase.class.getResource("pojotests").getFile(); //System.out.println("dataFilePath: " + dataFilePath); String location = "file://" + dataFilePath.substring(0,dataFilePath.length()-"org.apache.commons.beanutils.memoryleaktests.pojotests".length()); //System.out.println("location: " + location); StringBuffer newString = new StringBuffer(); for (int i=0;i<location.length();i++) { if (location.charAt(i)=='\\') { newString.append("/"); } else { newString.append(location.charAt(i)); } } String classLocation = newString.toString(); //System.out.println("classlocation: " + classLocation); URLClassLoader theLoader = URLClassLoader.newInstance(new URL[]{new URL(classLocation)},null); return theLoader; } /** * Produce a profiler report about where the leaks are. * * This requires JBoss's profiler be installed, see: * http://labs.jboss.com/jbossprofiler/ * * @param className The name of the class to profile */ private void profilerLeakReport(String test, String className) { /* * If you want a report about where the leaks are... uncomment this, * add jboss-profiler.jvmti.jar and jboss-commons.jar (for org.jboss.loggin). * You will then have a report for where the references are. System.out.println(" ----------------" + test + " START ----------------"); org.jboss.profiler.jvmti.JVMTIInterface jvmti = new org.jboss.profiler.jvmti.JVMTIInterface(); System.out.println(jvmti.exploreClassReferences(className, 8, true, true, true, false, false)); System.out.println(" ----------------" + test + " END ------------------"); */ } /** * Test for JDK 1.5 */ private boolean isPre15JVM() { String version = System.getProperty("java.specification.version"); StringTokenizer tokenizer = new StringTokenizer(version,"."); if (tokenizer.nextToken().equals("1")) { String minorVersion = tokenizer.nextToken(); if (minorVersion.equals("0")) return true; if (minorVersion.equals("1")) return true; if (minorVersion.equals("2")) return true; if (minorVersion.equals("3")) return true; if (minorVersion.equals("4")) return true; } return false; } /** * Get the total, free, used memory stats. * @return the total, free, used memory stats */ private String getMemoryStats() { java.text.DecimalFormat fmt = new java.text.DecimalFormat("#,##0"); Runtime runtime = Runtime.getRuntime(); long free = runtime.freeMemory() / 1024; long total = runtime.totalMemory() / 1024; long used = total - free; return "MEMORY - Total: " + fmt.format(total) + "k " + "Used: " + fmt.format(used) + "k " + "Free: " + fmt.format(free) + "k"; } } Other Commons Beanutils examples (source code examples)Here is a short list of links related to this Commons Beanutils MemoryLeakTestCase.java source code file: |
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