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8273831: PrintServiceLookup spawns 2 threads in the current classload…
…er, getting orphaned Backport-of: 687567822a5380fb7d8c5b54ae548b2a5c848187
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84
test/jdk/javax/print/PrintServiceLookup/FlushCustomClassLoader.java
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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. | ||
*/ | ||
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import java.awt.EventQueue; | ||
import java.lang.ref.Reference; | ||
import java.lang.ref.WeakReference; | ||
import java.net.URL; | ||
import java.net.URLClassLoader; | ||
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import javax.print.DocFlavor; | ||
import javax.print.PrintServiceLookup; | ||
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/** | ||
* @test | ||
* @bug 8273831 | ||
* @summary Tests custom class loader cleanup | ||
*/ | ||
public final class FlushCustomClassLoader { | ||
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public static void main(String[] args) throws Exception { | ||
Reference<ClassLoader> loader = getLoader("testMethod"); | ||
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int attempt = 0; | ||
while (loader.get() != null) { | ||
if (++attempt > 10) { | ||
throw new RuntimeException("Too many attempts: " + attempt); | ||
} | ||
System.gc(); | ||
Thread.sleep(1000); | ||
System.out.println("Not freed, attempt: " + attempt); | ||
} | ||
} | ||
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public static void testMethod() { | ||
DocFlavor flavor = DocFlavor.SERVICE_FORMATTED.PRINTABLE; | ||
PrintServiceLookup.lookupPrintServices(flavor, null); | ||
} | ||
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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(() -> {}); | ||
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URL url = FlushCustomClassLoader.class.getProtectionDomain() | ||
.getCodeSource().getLocation(); | ||
URLClassLoader loader = new URLClassLoader(new URL[]{url}, null); | ||
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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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