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/*
* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4909536
* @summary Ensure that the Introspector does not retain refs to classes
* @requires vm.opt.final.ClassUnloading
* @author Eamonn McManus
*
* @run clean ClassLeakTest
* @run build ClassLeakTest
* @run main ClassLeakTest
*/
import java.lang.ref.WeakReference;
import java.io.File;
import java.nio.file.Paths;
import java.net.*;
import java.util.*;
import javax.management.*;
import javax.management.loading.*;
public class ClassLeakTest {
public static void main(String[] args) throws Exception {
System.out.println("Testing that registering and unregistering a " +
"Standard MBean does not retain a reference to " +
"the MBean's class");
String[] cpaths = System.getProperty("test.classes", ".")
.split(File.pathSeparator);
URL[] urls = new URL[cpaths.length];
for (int i=0; i < cpaths.length; i++) {
urls[i] = Paths.get(cpaths[i]).toUri().toURL();
}
PrivateMLet mlet = new PrivateMLet(urls, null, false);
Class<?> shadowClass = mlet.loadClass(TestMBean.class.getName());
if (shadowClass == TestMBean.class) {
System.out.println("TEST INVALID: MLet got original " +
"TestMBean not shadow");
System.exit(1);
}
shadowClass = null;
MBeanServer mbs = MBeanServerFactory.createMBeanServer();
ObjectName mletName = new ObjectName("x:type=mlet");
mbs.registerMBean(mlet, mletName);
ObjectName testName = new ObjectName("x:type=test");
mbs.createMBean(Test.class.getName(), testName, mletName);
ClassLoader testLoader = mbs.getClassLoaderFor(testName);
if (testLoader != mlet) {
System.out.println("TEST INVALID: MBean's class loader is not " +
"MLet: " + testLoader);
System.exit(1);
}
testLoader = null;
MBeanInfo info = mbs.getMBeanInfo(testName);
MBeanAttributeInfo[] attrs = info.getAttributes();
if (attrs.length != 1 || !attrs[0].getName().equals("A")
|| !attrs[0].isReadable() || !attrs[0].isWritable()
|| attrs[0].isIs() || !attrs[0].getType().equals("int")) {
System.out.println("TEST FAILED: unexpected MBeanInfo attrs");
System.exit(1);
}
MBeanOperationInfo[] ops = info.getOperations();
if (ops.length != 1 || !ops[0].getName().equals("bogus")
|| ops[0].getSignature().length > 0
|| ops[0].getImpact() != MBeanOperationInfo.UNKNOWN
|| !ops[0].getReturnType().equals("void")) {
System.out.println("TEST FAILED: unexpected MBeanInfo ops");
System.exit(1);
}
if (info.getConstructors().length != 2) {
System.out.println("TEST FAILED: wrong number of constructors " +
"in introspected bean: " +
Arrays.asList(info.getConstructors()));
System.exit(1);
}
if (!info.getClassName().endsWith("Test")) {
System.out.println("TEST FAILED: wrong info class name: " +
info.getClassName());
System.exit(1);
}
mbs.unregisterMBean(testName);
mbs.unregisterMBean(mletName);
WeakReference mletRef = new WeakReference(mlet);
mlet = null;
System.out.println("MBean registered and unregistered, waiting for " +
"garbage collector to collect class loader");
for (int i = 0; i < 10000 && mletRef.get() != null; i++) {
System.gc();
Thread.sleep(1);
}
if (mletRef.get() == null)
System.out.println("Test passed: class loader was GC'd");
else {
System.out.println("TEST FAILED: class loader was not GC'd");
System.exit(1);
}
}
public static interface TestMBean {
public void bogus();
public int getA();
public void setA(int a);
}
public static class Test implements TestMBean {
public Test() {}
public Test(int x) {}
public void bogus() {}
public int getA() {return 0;}
public void setA(int a) {}
}
}
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