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/*
* Copyright (c) 2004, 2012, 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 5040740
* @summary annotations cause memory leak
* @author gafter
*
* @run shell LoaderLeak.sh
*/
import java.net.*;
import java.lang.ref.*;
import java.util.*;
import java.io.*;
public class Main {
public static void main(String[] args) throws Exception {
for (int i=0; i<100; i++)
doTest(args.length != 0);
}
static void doTest(boolean readAnn) throws Exception {
// URL classes = new URL("file://" + System.getProperty("user.dir") + "/classes");
// URL[] path = { classes };
// URLClassLoader loader = new URLClassLoader(path);
ClassLoader loader = new SimpleClassLoader();
WeakReference<Class<?>> c = new WeakReference(loader.loadClass("C"));
if (c.get() == null) throw new AssertionError();
if (c.get().getClassLoader() != loader) throw new AssertionError();
if (readAnn) System.out.println(c.get().getAnnotations()[0]);
if (c.get() == null) throw new AssertionError();
System.gc();
System.gc();
if (c.get() == null) throw new AssertionError();
System.gc();
System.gc();
loader = null;
// Might require multiple calls to System.gc() for weak-references
// processing to be complete. If the weak-reference is not cleared as
// expected we will hang here until timed out by the test harness.
while (true) {
System.gc();
Thread.sleep(20);
if (c.get() == null) {
break;
}
}
}
}
class SimpleClassLoader extends ClassLoader {
private Hashtable classes = new Hashtable();
public SimpleClassLoader() {
}
private byte getClassImplFromDataBase(String className)[] {
byte result[];
try {
FileInputStream fi = new FileInputStream("classes/"+className+".class");
result = new byte[fi.available()];
fi.read(result);
return result;
} catch (Exception e) {
/*
* If we caught an exception, either the class wasnt found or it
* was unreadable by our process.
*/
return null;
}
}
public Class loadClass(String className) throws ClassNotFoundException {
return (loadClass(className, true));
}
public synchronized Class loadClass(String className, boolean resolveIt)
throws ClassNotFoundException {
Class result;
byte classData[];
/* Check our local cache of classes */
result = (Class)classes.get(className);
if (result != null) {
return result;
}
/* Check with the primordial class loader */
try {
result = super.findSystemClass(className);
return result;
} catch (ClassNotFoundException e) {
}
/* Try to load it from our repository */
classData = getClassImplFromDataBase(className);
if (classData == null) {
throw new ClassNotFoundException();
}
/* Define it (parse the class file) */
result = defineClass(classData, 0, classData.length);
if (result == null) {
throw new ClassFormatError();
}
if (resolveIt) {
resolveClass(result);
}
classes.put(className, result);
return result;
}
}
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