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8259267: Refactor LoaderLeak shell test as java test.
Reviewed-by: rriggs, iignatyev, dfuchs
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/* | ||
* Copyright (c) 2004, 2021, 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. | ||
*/ | ||
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/* | ||
* @test | ||
* @bug 5040740 | ||
* @summary annotations cause memory leak | ||
* @library /test/lib | ||
* @build jdk.test.lib.process.* | ||
* @run testng LoaderLeakTest | ||
*/ | ||
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import jdk.test.lib.Utils; | ||
import jdk.test.lib.process.ProcessTools; | ||
import org.testng.annotations.BeforeClass; | ||
import org.testng.annotations.Test; | ||
import java.io.FileInputStream; | ||
import java.lang.annotation.Retention; | ||
import java.lang.ref.Reference; | ||
import java.lang.ref.WeakReference; | ||
import java.nio.file.*; | ||
import java.util.*; | ||
import static java.lang.annotation.RetentionPolicy.RUNTIME; | ||
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public class LoaderLeakTest { | ||
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@Test | ||
public void testWithoutReadingAnnotations() throws Throwable { | ||
runJavaProcessExpectSuccessExitCode("Main"); | ||
} | ||
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@Test | ||
public void testWithReadingAnnotations() throws Throwable { | ||
runJavaProcessExpectSuccessExitCode("Main", "foo"); | ||
} | ||
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private void runJavaProcessExpectSuccessExitCode(String ... command) throws Throwable { | ||
var processBuilder = ProcessTools.createJavaProcessBuilder(command) | ||
.directory(Paths.get(Utils.TEST_CLASSES).toFile()); | ||
ProcessTools.executeCommand(processBuilder).shouldHaveExitValue(0); | ||
} | ||
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} | ||
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class Main { | ||
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public static void main(String[] args) throws Exception { | ||
for (int i = 0; i < 100; i++) { | ||
doTest(args.length != 0); | ||
} | ||
} | ||
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static void doTest(boolean readAnn) throws Exception { | ||
ClassLoader loader = new SimpleClassLoader(); | ||
var c = new WeakReference<Class<?>>(loader.loadClass("C")); | ||
if (c.refersTo(null)) throw new AssertionError("class missing after loadClass"); | ||
// c.get() should never return null here since we hold a strong | ||
// reference to the class loader that loaded the class referred by c. | ||
if (c.get().getClassLoader() != loader) throw new AssertionError("wrong classloader"); | ||
if (readAnn) System.out.println(c.get().getAnnotations()[0]); | ||
if (c.refersTo(null)) throw new AssertionError("class missing before GC"); | ||
System.gc(); | ||
System.gc(); | ||
if (c.refersTo(null)) throw new AssertionError("class missing after GC but before loader is unreachable"); | ||
System.gc(); | ||
System.gc(); | ||
Reference.reachabilityFence(loader); | ||
loader = null; | ||
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// 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.refersTo(null)) { | ||
break; | ||
} | ||
} | ||
} | ||
} | ||
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@Retention(RUNTIME) | ||
@interface A { | ||
B b(); | ||
} | ||
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@interface B { } | ||
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@A(b=@B()) class C { } | ||
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class SimpleClassLoader extends ClassLoader { | ||
public SimpleClassLoader() { } | ||
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private byte[] getClassImplFromDataBase(String className) { | ||
try { | ||
return Files.readAllBytes(Paths.get(className + ".class")); | ||
} catch (Exception e) { | ||
throw new Error("could not load class " + className, e); | ||
} | ||
} | ||
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@Override | ||
public Class<?> loadClass(String className, boolean resolveIt) | ||
throws ClassNotFoundException { | ||
switch (className) { | ||
case "A", "B", "C" -> { | ||
var classData = getClassImplFromDataBase(className); | ||
return defineClass(className, classData, 0, classData.length); | ||
} | ||
} | ||
return super.loadClass(className, resolveIt); | ||
} | ||
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} |
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