src/test/java/org/apache/commons/beanutils2/BeanificationTest.java - commons-beanutils - Git at Google

 /*
  * 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
  *
  *      https://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.beanutils2;

 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNull;

 import java.lang.ref.ReferenceQueue;
 import java.lang.ref.WeakReference;
 import java.util.Map;
 import java.util.WeakHashMap;

 import org.apache.commons.logging.LogFactory;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;

 /**
  * <p>
  * Test Case for changes made during Beanutils Beanification
  * </p>
  */
 class BeanificationTest {

     final class Signal {
         private Exception e;
         private int signal;
         private BeanUtilsBean bean;
         private PropertyUtilsBean propertyUtils;
         private ConvertUtilsBean convertUtils;
         private Object marker;

         public BeanUtilsBean getBean() {
             return bean;
         }

         public ConvertUtilsBean getConvertUtils() {
             return convertUtils;
         }

         public Exception getException() {
             return e;
         }

         public Object getMarkerObject() {
             return marker;
         }

         public PropertyUtilsBean getPropertyUtils() {
             return propertyUtils;
         }

         public int getSignal() {
             return signal;
         }

         public void setBean(final BeanUtilsBean bean) {
             this.bean = bean;
         }

         public void setConvertUtils(final ConvertUtilsBean convertUtils) {
             this.convertUtils = convertUtils;
         }

         public void setException(final Exception e) {
             this.e = e;
         }

         public void setMarkerObject(final Object marker) {
             this.marker = marker;
         }

         public void setPropertyUtils(final PropertyUtilsBean propertyUtils) {
             this.propertyUtils = propertyUtils;
         }

         public void setSignal(final int signal) {
             this.signal = signal;
         }
     }

     final class TestClassLoader extends ClassLoader {
         @Override
         public String toString() {
             return "TestClassLoader";
         }
     }

     /** Maximum number of iterations before our test fails */
     public static final int MAX_GC_ITERATIONS = 50;

     /**
      * Sets up instance variables required by this test case.
      */
     @BeforeEach
     public void setUp() {
         ConvertUtils.deregister();
     }

     /**
      * Tear down instance variables required by this test case.
      */
     @AfterEach
     public void tearDown() {
         // No action required
     }

     /** Tests whether different threads can set BeanUtils instances correctly */
     @Test
     void testBeanUtilsBeanSetInstance() throws Exception {

         final class SetInstanceTesterThread extends Thread {

             private final Signal signal;
             private final BeanUtilsBean bean;

             SetInstanceTesterThread(final Signal signal, final BeanUtilsBean bean) {
                 this.signal = signal;
                 this.bean = bean;
             }

             @Override
             public void run() {
                 BeanUtilsBean.setInstance(bean);
                 signal.setSignal(21);
                 signal.setBean(BeanUtilsBean.getInstance());
             }

             @Override
             public String toString() {
                 return "SetInstanceTesterThread";
             }
         }

         final Signal signal = new Signal();
         signal.setSignal(1);

         final BeanUtilsBean beanOne = new BeanUtilsBean();
         final BeanUtilsBean beanTwo = new BeanUtilsBean();

         final SetInstanceTesterThread thread = new SetInstanceTesterThread(signal, beanTwo);
         thread.setContextClassLoader(new TestClassLoader());

         BeanUtilsBean.setInstance(beanOne);
         assertEquals(beanOne, BeanUtilsBean.getInstance(), "Start thread gets right instance");

         thread.start();
         thread.join();

         assertEquals(21, signal.getSignal(), "Signal not set by test thread");
         assertEquals(beanOne, BeanUtilsBean.getInstance(), "Second thread preserves value");
         assertEquals(beanTwo, signal.getBean(), "Second thread gets value it set");
     }

     /** Tests whether calls are independent for different class loaders */
     @Test
     void testContextClassloaderIndependence() throws Exception {

         final class TestIndependenceThread extends Thread {
             private final Signal signal;
             private final PrimitiveBean bean;

             TestIndependenceThread(final Signal signal, final PrimitiveBean bean) {
                 this.signal = signal;
                 this.bean = bean;
             }

             @Override
             public void run() {
                 try {
                     signal.setSignal(3);
                     final Converter c = (type, value) -> ConvertUtils.primitiveToWrapper(Integer.TYPE).cast(new Integer(9));
                     ConvertUtils.register(c, Integer.TYPE);
                     BeanUtils.setProperty(bean, "int", new Integer(1));
                 } catch (final Exception e) {
                     e.printStackTrace();
                     signal.setException(e);
                 }
             }

             @Override
             public String toString() {
                 return "TestIndependenceThread";
             }
         }

         final PrimitiveBean bean = new PrimitiveBean();
         BeanUtils.setProperty(bean, "int", new Integer(1));
         assertEquals(1, bean.getInt(), "Wrong property value (1)");

         final Converter c = (type, value) -> ConvertUtils.primitiveToWrapper(type).cast(new Integer(5));
         ConvertUtils.register(c, Integer.TYPE);
         BeanUtils.setProperty(bean, "int", new Integer(1));
         assertEquals(5, bean.getInt(), "Wrong property value(2)");

         final Signal signal = new Signal();
         signal.setSignal(1);
         final TestIndependenceThread thread = new TestIndependenceThread(signal, bean);
         thread.setContextClassLoader(new TestClassLoader());

         thread.start();
         thread.join();

         assertNull(signal.getException(), "Exception thrown by test thread:" + signal.getException());
         assertEquals(3, signal.getSignal(), "Signal not set by test thread");
         assertEquals(9, bean.getInt(), "Wrong property value(3)");

     }

     /**
      * Tests whether difference instances are loaded by different context class loaders.
      */
     @Test
     void testContextClassLoaderLocal() throws Exception {

         final class CCLLTesterThread extends Thread {

             private final Signal signal;
             private final ContextClassLoaderLocal<Integer> ccll;

             CCLLTesterThread(final Signal signal, final ContextClassLoaderLocal<Integer> ccll) {
                 this.signal = signal;
                 this.ccll = ccll;
             }

             @Override
             public void run() {
                 ccll.set(new Integer(1789));
                 signal.setSignal(2);
                 signal.setMarkerObject(ccll.get());
             }

             @Override
             public String toString() {
                 return "CCLLTesterThread";
             }
         }

         final ContextClassLoaderLocal<Integer> ccll = new ContextClassLoaderLocal<>();
         ccll.set(new Integer(1776));
         assertEquals(new Integer(1776), ccll.get(), "Start thread sets value");

         final Signal signal = new Signal();
         signal.setSignal(1);

         final CCLLTesterThread thread = new CCLLTesterThread(signal, ccll);
         thread.setContextClassLoader(new TestClassLoader());

         thread.start();
         thread.join();

         assertEquals(2, signal.getSignal(), "Signal not set by test thread");
         assertEquals(new Integer(1776), ccll.get(), "Second thread preserves value");
         assertEquals(new Integer(1789), signal.getMarkerObject(), "Second thread gets value it set");
     }

     /** Tests whether the unset method works */
     @Test
     void testContextClassLoaderUnset() throws Exception {
         final BeanUtilsBean beanOne = new BeanUtilsBean();
         final ContextClassLoaderLocal<BeanUtilsBean> ccll = new ContextClassLoaderLocal<>();
         ccll.set(beanOne);
         assertEquals(beanOne, ccll.get(), "Start thread gets right instance");
         ccll.unset();
         assertNotEquals(beanOne, ccll.get(), "Unset works");
     }

     /**
      * Tests whether difference instances are loaded by different context class loaders.
      */
     @Test
     void testGetByContextClassLoader() throws Exception {

         final class GetBeanUtilsBeanThread extends Thread {

             private final Signal signal;

             GetBeanUtilsBeanThread(final Signal signal) {
                 this.signal = signal;
             }

             @Override
             public void run() {
                 signal.setSignal(2);
                 signal.setBean(BeanUtilsBean.getInstance());
                 signal.setConvertUtils(ConvertUtilsBean.getInstance());
                 signal.setPropertyUtils(PropertyUtilsBean.getInstance());
             }

             @Override
             public String toString() {
                 return "GetBeanUtilsBeanThread";
             }
         }

         final Signal signal = new Signal();
         signal.setSignal(1);

         final GetBeanUtilsBeanThread thread = new GetBeanUtilsBeanThread(signal);
         thread.setContextClassLoader(new TestClassLoader());

         thread.start();
         thread.join();

         assertEquals(2, signal.getSignal(), "Signal not set by test thread");
         assertNotEquals(BeanUtilsBean.getInstance(), signal.getBean(), "Different BeanUtilsBean instances per context classloader");
         assertNotEquals(ConvertUtilsBean.getInstance(), signal.getConvertUtils(), "Different ConvertUtilsBean instances per context classloader");
         assertNotEquals(PropertyUtilsBean.getInstance(), signal.getPropertyUtils(), "Different PropertyUtilsBean instances per context classloader");
     }

     /** Tests whether class loaders and beans are released from memory */
     @Test
     void testMemoryLeak() throws Exception {
         // many thanks to Juozas Baliuka for suggesting this methodology
         TestClassLoader loader = new TestClassLoader();
         final WeakReference<ClassLoader> loaderReference = new WeakReference<>(loader);
         BeanUtilsBean.getInstance();

         final class GetBeanUtilsBeanThread extends Thread {

             BeanUtilsBean beanUtils;
             ConvertUtilsBean convertUtils;
             PropertyUtilsBean propertyUtils;

             GetBeanUtilsBeanThread() {
             }

             @Override
             public void run() {
                 beanUtils = BeanUtilsBean.getInstance();
                 convertUtils = ConvertUtilsBean.getInstance();
                 propertyUtils = PropertyUtilsBean.getInstance();
                 // XXX Log keeps a reference around!
                 LogFactory.releaseAll();
             }

             @Override
             public String toString() {
                 return "GetBeanUtilsBeanThread";
             }
         }

         GetBeanUtilsBeanThread thread = new GetBeanUtilsBeanThread();
         @SuppressWarnings("unused")
         final WeakReference<Thread> threadWeakReference = new WeakReference<>(thread);
         thread.setContextClassLoader(loader);

         thread.start();
         thread.join();

         final WeakReference<BeanUtilsBean> beanUtilsReference = new WeakReference<>(thread.beanUtils);
         final WeakReference<PropertyUtilsBean> propertyUtilsReference = new WeakReference<>(thread.propertyUtils);
         final WeakReference<ConvertUtilsBean> convertUtilsReference = new WeakReference<>(thread.convertUtils);

         assertNotNull(loaderReference.get(), "Weak reference released early (1)");
         assertNotNull(beanUtilsReference.get(), "Weak reference released early (2)");
         assertNotNull(propertyUtilsReference.get(), "Weak reference released early (3)");
         assertNotNull(convertUtilsReference.get(), "Weak reference released early (4)");

         // dereference strong references
         loader = null;
         thread.setContextClassLoader(null);
         thread = null;

         int iterations = 0;
         int bytz = 2;
         while (true) {
             BeanUtilsBean.getInstance();
             System.gc();
             assertFalse(iterations++ > MAX_GC_ITERATIONS, "Max iterations reached before resource released.");

             if (loaderReference.get() == null && beanUtilsReference.get() == null && propertyUtilsReference.get() == null
                     && convertUtilsReference.get() == null) {
                 break;

             }
             // create garbage:
             @SuppressWarnings("unused")
             final byte[] b = new byte[bytz];
             bytz *= 2;
         }
     }

     /** Tests whether class loaders and beans are released from memory by the map used by BeanUtils. */
     @Test
     void testMemoryLeak2() throws Exception {
         // many thanks to Juozas Baliuka for suggesting this methodology
         TestClassLoader loader = new TestClassLoader();
         final ReferenceQueue<Object> queue = new ReferenceQueue<>();
         final WeakReference<ClassLoader> loaderReference = new WeakReference<>(loader, queue);
         Integer test = new Integer(1);

         final WeakReference<Integer> testReference = new WeakReference<>(test, queue);
         // Map map = new ReferenceMap(ReferenceMap.WEAK, ReferenceMap.HARD, true);
         final Map<Object, Object> map = new WeakHashMap<>();
         map.put(loader, test);

         assertEquals(test, map.get(loader), "In map");
         assertNotNull(loaderReference.get(), "Weak reference released early (1)");
         assertNotNull(testReference.get(), "Weak reference released early (2)");

         // dereference strong references
         loader = null;
         test = null;

         int iterations = 0;
         int bytz = 2;
         while (true) {
             System.gc();
             assertFalse(iterations++ > MAX_GC_ITERATIONS, "Max iterations reached before resource released.");

             map.isEmpty();

             if (loaderReference.get() == null && testReference.get() == null) {
                 break;

             }
             // create garbage:
             @SuppressWarnings("unused")
             final byte[] b = new byte[bytz];
             bytz *= 2;
         }
     }

     /** Test of the methodology we'll use for some of the later tests */
     @Test
     void testMemoryTestMethodology() throws Exception {
         // test methodology
         // many thanks to Juozas Baliuka for suggesting this method
         ClassLoader loader = new ClassLoader(this.getClass().getClassLoader()) {
         };
         final WeakReference<ClassLoader> reference = new WeakReference<>(loader);
         @SuppressWarnings("unused")
         Class<?> myClass = loader.loadClass("org.apache.commons.beanutils2.BetaBean");

         assertNotNull(reference.get(), "Weak reference released early");

         // dereference class loader and class:
         loader = null;
         myClass = null;

         int iterations = 0;
         int bytz = 2;
         while (true) {
             System.gc();
             assertFalse(iterations++ > MAX_GC_ITERATIONS, "Max iterations reached before resource released.");
             if (reference.get() == null) {
                 break;

             }
             // create garbage:
             @SuppressWarnings("unused")
             final byte[] b = new byte[bytz];
             bytz *= 2;
         }
     }
 }
	/*
	* 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
	*
	* https://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.beanutils2;

	import static org.junit.jupiter.api.Assertions.assertEquals;
	import static org.junit.jupiter.api.Assertions.assertFalse;
	import static org.junit.jupiter.api.Assertions.assertNotEquals;
	import static org.junit.jupiter.api.Assertions.assertNotNull;
	import static org.junit.jupiter.api.Assertions.assertNull;

	import java.lang.ref.ReferenceQueue;
	import java.lang.ref.WeakReference;
	import java.util.Map;
	import java.util.WeakHashMap;

	import org.apache.commons.logging.LogFactory;
	import org.junit.jupiter.api.AfterEach;
	import org.junit.jupiter.api.BeforeEach;
	import org.junit.jupiter.api.Test;

	/**
	* <p>
	* Test Case for changes made during Beanutils Beanification
	* </p>
	*/
	class BeanificationTest {

	final class Signal {
	private Exception e;
	private int signal;
	private BeanUtilsBean bean;
	private PropertyUtilsBean propertyUtils;
	private ConvertUtilsBean convertUtils;
	private Object marker;

	public BeanUtilsBean getBean() {
	return bean;
	}

	public ConvertUtilsBean getConvertUtils() {
	return convertUtils;
	}

	public Exception getException() {
	return e;
	}

	public Object getMarkerObject() {
	return marker;
	}

	public PropertyUtilsBean getPropertyUtils() {
	return propertyUtils;
	}

	public int getSignal() {
	return signal;
	}

	public void setBean(final BeanUtilsBean bean) {
	this.bean = bean;
	}

	public void setConvertUtils(final ConvertUtilsBean convertUtils) {
	this.convertUtils = convertUtils;
	}

	public void setException(final Exception e) {
	this.e = e;
	}

	public void setMarkerObject(final Object marker) {
	this.marker = marker;
	}

	public void setPropertyUtils(final PropertyUtilsBean propertyUtils) {
	this.propertyUtils = propertyUtils;
	}

	public void setSignal(final int signal) {
	this.signal = signal;
	}
	}

	final class TestClassLoader extends ClassLoader {
	@Override
	public String toString() {
	return "TestClassLoader";
	}
	}

	/** Maximum number of iterations before our test fails */
	public static final int MAX_GC_ITERATIONS = 50;

	/**
	* Sets up instance variables required by this test case.
	*/
	@BeforeEach
	public void setUp() {
	ConvertUtils.deregister();
	}

	/**
	* Tear down instance variables required by this test case.
	*/
	@AfterEach
	public void tearDown() {
	// No action required
	}

	/** Tests whether different threads can set BeanUtils instances correctly */
	@Test
	void testBeanUtilsBeanSetInstance() throws Exception {

	final class SetInstanceTesterThread extends Thread {

	private final Signal signal;
	private final BeanUtilsBean bean;

	SetInstanceTesterThread(final Signal signal, final BeanUtilsBean bean) {
	this.signal = signal;
	this.bean = bean;
	}

	@Override
	public void run() {
	BeanUtilsBean.setInstance(bean);
	signal.setSignal(21);
	signal.setBean(BeanUtilsBean.getInstance());
	}

	@Override
	public String toString() {
	return "SetInstanceTesterThread";
	}
	}

	final Signal signal = new Signal();
	signal.setSignal(1);

	final BeanUtilsBean beanOne = new BeanUtilsBean();
	final BeanUtilsBean beanTwo = new BeanUtilsBean();

	final SetInstanceTesterThread thread = new SetInstanceTesterThread(signal, beanTwo);
	thread.setContextClassLoader(new TestClassLoader());

	BeanUtilsBean.setInstance(beanOne);
	assertEquals(beanOne, BeanUtilsBean.getInstance(), "Start thread gets right instance");

	thread.start();
	thread.join();

	assertEquals(21, signal.getSignal(), "Signal not set by test thread");
	assertEquals(beanOne, BeanUtilsBean.getInstance(), "Second thread preserves value");
	assertEquals(beanTwo, signal.getBean(), "Second thread gets value it set");
	}

	/** Tests whether calls are independent for different class loaders */
	@Test
	void testContextClassloaderIndependence() throws Exception {

	final class TestIndependenceThread extends Thread {
	private final Signal signal;
	private final PrimitiveBean bean;

	TestIndependenceThread(final Signal signal, final PrimitiveBean bean) {
	this.signal = signal;
	this.bean = bean;
	}

	@Override
	public void run() {
	try {
	signal.setSignal(3);
	final Converter c = (type, value) -> ConvertUtils.primitiveToWrapper(Integer.TYPE).cast(new Integer(9));
	ConvertUtils.register(c, Integer.TYPE);
	BeanUtils.setProperty(bean, "int", new Integer(1));
	} catch (final Exception e) {
	e.printStackTrace();
	signal.setException(e);
	}
	}

	@Override
	public String toString() {
	return "TestIndependenceThread";
	}
	}

	final PrimitiveBean bean = new PrimitiveBean();
	BeanUtils.setProperty(bean, "int", new Integer(1));
	assertEquals(1, bean.getInt(), "Wrong property value (1)");

	final Converter c = (type, value) -> ConvertUtils.primitiveToWrapper(type).cast(new Integer(5));
	ConvertUtils.register(c, Integer.TYPE);
	BeanUtils.setProperty(bean, "int", new Integer(1));
	assertEquals(5, bean.getInt(), "Wrong property value(2)");

	final Signal signal = new Signal();
	signal.setSignal(1);
	final TestIndependenceThread thread = new TestIndependenceThread(signal, bean);
	thread.setContextClassLoader(new TestClassLoader());

	thread.start();
	thread.join();

	assertNull(signal.getException(), "Exception thrown by test thread:" + signal.getException());
	assertEquals(3, signal.getSignal(), "Signal not set by test thread");
	assertEquals(9, bean.getInt(), "Wrong property value(3)");

	}

	/**
	* Tests whether difference instances are loaded by different context class loaders.
	*/
	@Test
	void testContextClassLoaderLocal() throws Exception {

	final class CCLLTesterThread extends Thread {

	private final Signal signal;
	private final ContextClassLoaderLocal<Integer> ccll;

	CCLLTesterThread(final Signal signal, final ContextClassLoaderLocal<Integer> ccll) {
	this.signal = signal;
	this.ccll = ccll;
	}

	@Override
	public void run() {
	ccll.set(new Integer(1789));
	signal.setSignal(2);
	signal.setMarkerObject(ccll.get());
	}

	@Override
	public String toString() {
	return "CCLLTesterThread";
	}
	}

	final ContextClassLoaderLocal<Integer> ccll = new ContextClassLoaderLocal<>();
	ccll.set(new Integer(1776));
	assertEquals(new Integer(1776), ccll.get(), "Start thread sets value");

	final Signal signal = new Signal();
	signal.setSignal(1);

	final CCLLTesterThread thread = new CCLLTesterThread(signal, ccll);
	thread.setContextClassLoader(new TestClassLoader());

	thread.start();
	thread.join();

	assertEquals(2, signal.getSignal(), "Signal not set by test thread");
	assertEquals(new Integer(1776), ccll.get(), "Second thread preserves value");
	assertEquals(new Integer(1789), signal.getMarkerObject(), "Second thread gets value it set");
	}

	/** Tests whether the unset method works */
	@Test
	void testContextClassLoaderUnset() throws Exception {
	final BeanUtilsBean beanOne = new BeanUtilsBean();
	final ContextClassLoaderLocal<BeanUtilsBean> ccll = new ContextClassLoaderLocal<>();
	ccll.set(beanOne);
	assertEquals(beanOne, ccll.get(), "Start thread gets right instance");
	ccll.unset();
	assertNotEquals(beanOne, ccll.get(), "Unset works");
	}

	/**
	* Tests whether difference instances are loaded by different context class loaders.
	*/
	@Test
	void testGetByContextClassLoader() throws Exception {

	final class GetBeanUtilsBeanThread extends Thread {

	private final Signal signal;

	GetBeanUtilsBeanThread(final Signal signal) {
	this.signal = signal;
	}

	@Override
	public void run() {
	signal.setSignal(2);
	signal.setBean(BeanUtilsBean.getInstance());
	signal.setConvertUtils(ConvertUtilsBean.getInstance());
	signal.setPropertyUtils(PropertyUtilsBean.getInstance());
	}

	@Override
	public String toString() {
	return "GetBeanUtilsBeanThread";
	}
	}

	final Signal signal = new Signal();
	signal.setSignal(1);

	final GetBeanUtilsBeanThread thread = new GetBeanUtilsBeanThread(signal);
	thread.setContextClassLoader(new TestClassLoader());

	thread.start();
	thread.join();

	assertEquals(2, signal.getSignal(), "Signal not set by test thread");
	assertNotEquals(BeanUtilsBean.getInstance(), signal.getBean(), "Different BeanUtilsBean instances per context classloader");
	assertNotEquals(ConvertUtilsBean.getInstance(), signal.getConvertUtils(), "Different ConvertUtilsBean instances per context classloader");
	assertNotEquals(PropertyUtilsBean.getInstance(), signal.getPropertyUtils(), "Different PropertyUtilsBean instances per context classloader");
	}

	/** Tests whether class loaders and beans are released from memory */
	@Test
	void testMemoryLeak() throws Exception {
	// many thanks to Juozas Baliuka for suggesting this methodology
	TestClassLoader loader = new TestClassLoader();
	final WeakReference<ClassLoader> loaderReference = new WeakReference<>(loader);
	BeanUtilsBean.getInstance();

	final class GetBeanUtilsBeanThread extends Thread {

	BeanUtilsBean beanUtils;
	ConvertUtilsBean convertUtils;
	PropertyUtilsBean propertyUtils;

	GetBeanUtilsBeanThread() {
	}

	@Override
	public void run() {
	beanUtils = BeanUtilsBean.getInstance();
	convertUtils = ConvertUtilsBean.getInstance();
	propertyUtils = PropertyUtilsBean.getInstance();
	// XXX Log keeps a reference around!
	LogFactory.releaseAll();
	}

	@Override
	public String toString() {
	return "GetBeanUtilsBeanThread";
	}
	}

	GetBeanUtilsBeanThread thread = new GetBeanUtilsBeanThread();
	@SuppressWarnings("unused")
	final WeakReference<Thread> threadWeakReference = new WeakReference<>(thread);
	thread.setContextClassLoader(loader);

	thread.start();
	thread.join();

	final WeakReference<BeanUtilsBean> beanUtilsReference = new WeakReference<>(thread.beanUtils);
	final WeakReference<PropertyUtilsBean> propertyUtilsReference = new WeakReference<>(thread.propertyUtils);
	final WeakReference<ConvertUtilsBean> convertUtilsReference = new WeakReference<>(thread.convertUtils);

	assertNotNull(loaderReference.get(), "Weak reference released early (1)");
	assertNotNull(beanUtilsReference.get(), "Weak reference released early (2)");
	assertNotNull(propertyUtilsReference.get(), "Weak reference released early (3)");
	assertNotNull(convertUtilsReference.get(), "Weak reference released early (4)");

	// dereference strong references
	loader = null;
	thread.setContextClassLoader(null);
	thread = null;

	int iterations = 0;
	int bytz = 2;
	while (true) {
	BeanUtilsBean.getInstance();
	System.gc();
	assertFalse(iterations++ > MAX_GC_ITERATIONS, "Max iterations reached before resource released.");

	if (loaderReference.get() == null && beanUtilsReference.get() == null && propertyUtilsReference.get() == null
	&& convertUtilsReference.get() == null) {
	break;

	}
	// create garbage:
	@SuppressWarnings("unused")
	final byte[] b = new byte[bytz];
	bytz *= 2;
	}
	}

	/** Tests whether class loaders and beans are released from memory by the map used by BeanUtils. */
	@Test
	void testMemoryLeak2() throws Exception {
	// many thanks to Juozas Baliuka for suggesting this methodology
	TestClassLoader loader = new TestClassLoader();
	final ReferenceQueue<Object> queue = new ReferenceQueue<>();
	final WeakReference<ClassLoader> loaderReference = new WeakReference<>(loader, queue);
	Integer test = new Integer(1);

	final WeakReference<Integer> testReference = new WeakReference<>(test, queue);
	// Map map = new ReferenceMap(ReferenceMap.WEAK, ReferenceMap.HARD, true);
	final Map<Object, Object> map = new WeakHashMap<>();
	map.put(loader, test);

	assertEquals(test, map.get(loader), "In map");
	assertNotNull(loaderReference.get(), "Weak reference released early (1)");
	assertNotNull(testReference.get(), "Weak reference released early (2)");

	// dereference strong references
	loader = null;
	test = null;

	int iterations = 0;
	int bytz = 2;
	while (true) {
	System.gc();
	assertFalse(iterations++ > MAX_GC_ITERATIONS, "Max iterations reached before resource released.");

	map.isEmpty();

	if (loaderReference.get() == null && testReference.get() == null) {
	break;

	}
	// create garbage:
	@SuppressWarnings("unused")
	final byte[] b = new byte[bytz];
	bytz *= 2;
	}
	}

	/** Test of the methodology we'll use for some of the later tests */
	@Test
	void testMemoryTestMethodology() throws Exception {
	// test methodology
	// many thanks to Juozas Baliuka for suggesting this method
	ClassLoader loader = new ClassLoader(this.getClass().getClassLoader()) {
	};
	final WeakReference<ClassLoader> reference = new WeakReference<>(loader);
	@SuppressWarnings("unused")
	Class<?> myClass = loader.loadClass("org.apache.commons.beanutils2.BetaBean");

	assertNotNull(reference.get(), "Weak reference released early");

	// dereference class loader and class:
	loader = null;
	myClass = null;

	int iterations = 0;
	int bytz = 2;
	while (true) {
	System.gc();
	assertFalse(iterations++ > MAX_GC_ITERATIONS, "Max iterations reached before resource released.");
	if (reference.get() == null) {
	break;

	}
	// create garbage:
	@SuppressWarnings("unused")
	final byte[] b = new byte[bytz];
	bytz *= 2;
	}
	}
	}