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Commons Beanutils example source code file (Jira347TestCase.java)
The Commons Beanutils Jira347TestCase.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.bugs; import java.beans.IntrospectionException; import java.lang.ref.SoftReference; import java.lang.reflect.Method; import java.net.MalformedURLException; import java.net.URL; import java.net.URLClassLoader; import junit.framework.TestCase; import org.apache.commons.beanutils.MappedPropertyDescriptor; import org.apache.commons.beanutils.memoryleaktests.MemoryLeakTestCase; /** * Test case for Jira issue# BEANUTILS-347. * <br/> * See https://issues.apache.org/jira/browse/BEANUTILS-347 * * @version $Revision: 806915 $ $Date: 2009-08-23 01:50:23 +0100 (Sun, 23 Aug 2009) $ */ public class Jira347TestCase extends TestCase { /** * Tests that MappedPropertyDescriptor does not throw an exception while re-creating a Method reference after it * has been garbage collected under the following circumstances. * - a class has a property 'mappedProperty' * - there is no getter for this property * - there is method setMappedProperty(MappedPropertyTestBean,MappedPropertyTestBean) * * In this case getMappedWriteMethod should not throw an exception after the method reference has been garbage collected. * It is essential that in both cases the same method is returned or in both cases null. * If the constructor of the MappedPropertyDescriptor would recognize the situation (of the first param not being of type String) * this would be fine as well. */ public void testMappedPropertyDescriptor_AnyArgsProperty() throws Exception { String className = "org.apache.commons.beanutils.MappedPropertyTestBean"; 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); // now start the test MappedPropertyDescriptor descriptor = null; try { descriptor = new MappedPropertyDescriptor("anyMapped", beanClass); } catch (IntrospectionException e) { // this would be fine as well } if (descriptor != null) { String m1 = getMappedWriteMethod(descriptor); forceGarbageCollection(); try { String m2 = getMappedWriteMethod(descriptor); assertEquals("Method returned post garbage collection differs from Method returned prior to gc", m1, m2); } catch (RuntimeException e) { fail("getMappedWriteMethod threw an exception after garbage collection " + e); } } } /** * Retrieves the string representation of the mapped write method * for the given descriptor. * This conversion is needed as there must not be strong reference to the * Method object outside of this method as otherwise the garbage collector will not * clean up the soft reference within the MappedPropertyDescriptor. * * @return the string representation or null if mapped write method does not exist */ private String getMappedWriteMethod(MappedPropertyDescriptor descriptor) { Method m = descriptor.getMappedWriteMethod(); return m == null ? null : m.toString(); } /** * 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; } } Other Commons Beanutils examples (source code examples)Here is a short list of links related to this Commons Beanutils Jira347TestCase.java source code file: |
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