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/*
* Copyright Amazon.com Inc. 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.
*/
import java.awt.EventQueue;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.net.URL;
import java.net.URLClassLoader;
import javax.print.DocFlavor;
import javax.print.PrintServiceLookup;
/**
* @test
* @bug 8273831
* @summary Tests custom class loader cleanup
* @library /javax/swing/regtesthelpers
* @build Util
* @run main/timeout=60/othervm -Xmx32m FlushCustomClassLoader
*/
public final class FlushCustomClassLoader {
public static void main(String[] args) throws Exception {
Reference<ClassLoader> loader = getLoader("testMethod");
int attempt = 0;
while (loader.get() != null) {
Util.generateOOME();
System.out.println("Not freed, attempt: " + attempt++);
}
}
public static void testMethod() {
DocFlavor flavor = DocFlavor.SERVICE_FORMATTED.PRINTABLE;
PrintServiceLookup.lookupPrintServices(flavor, null);
}
private static Reference<ClassLoader> getLoader(String m) throws Exception {
/*
* The print services are stored per the AppContext, and each AppContext
* caches the "current" class loader during creation.
* see javax.print.PrintServiceLookup.
*
* To prevent AppContext from cache our test loader we force AppContext
* creation early by the invokeAndWait.
* The "EventQueue.invokeAndWait(() -> {});" can be removed when the
* AppContext usage will be deleted in the PrintServiceLookup
*/
EventQueue.invokeAndWait(() -> {});
URL url = FlushCustomClassLoader.class.getProtectionDomain()
.getCodeSource().getLocation();
URLClassLoader loader = new URLClassLoader(new URL[]{url}, null);
Thread ct = Thread.currentThread();
ct.setContextClassLoader(loader);
Class<?> cls = Class.forName("FlushCustomClassLoader", true, loader);
cls.getDeclaredMethod(m).invoke(null);
ct.setContextClassLoader(null);
loader.close();
return new WeakReference<>(loader);
}
}
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