Can't instantiate anonymous class more than 16 times

[Rémi Forax]

Le 10/08/2009 21:56, Wei Yin Teo a écrit :
> Hi,
>
> After loading an anonymous class through the AnonymousClassLoader, I 
> could construct the object by calling the newInstance on the class. 
> But the 16th time failed. Here is the code and stack trace

hum, perhaps a bug,
could you try with :

AnonymousClassLoader acl = new AnonymousClassLoader(LoadingTest.class);

cheers,
Rémi

>
> class LoadingTest {
>
> public void testLoading() {
> AnonymousClassLoader acl = new AnonymousClassLoader();
>
> Class<?> testClass = acl.loadClass(getClassBytes());
>
> for (int i = 0; i < 100; i++) {
> try {
> testClass.newInstance();
> }
> catch(Throwable e) {
> System.out.println("failed at " + i);
> e.printStackTrace();
> throw e;
> }
> }
>    }
>
>    private byte[] getClassBytes() {
> ClassWriter cw = new ClassWriter(0);
> MethodVisitor mv;
>
> cw.visit(V1_7, ACC_PUBLIC + ACC_SUPER, "InstanceTest", null,
> "java/lang/Object", null);
> mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
> mv.visitCode();
> Label l0 = new Label();
> mv.visitLabel(l0);
> mv.visitVarInsn(ALOAD, 0);
> mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
> mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out",
> "Ljava/io/PrintStream;");
> mv.visitLdcInsn("constructed");
> mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println",
> "(Ljava/lang/String;)V");
> mv.visitInsn(RETURN);
> Label l1 = new Label();
> mv.visitLabel(l1);
> mv
> .visitLocalVariable("this",
> "Ltest/com/gs/s4j/misc/AnonymousClassLoading;", null,
> l0, l1, 0);
> mv.visitMaxs(2, 1);
> mv.visitEnd();
> cw.visitEnd();
> return cw.toByteArray():
>   }
> }
>
> It appears at the 16th time, the JVM generate a ConstructorAccessor 
> and it does not know how to handle anonymous class.
>
> Thanks,
> Wei
>
> Here is the output from the code.
> ====================================================================================================================
> constructed
> constructed
> constructed
> constructed
> constructed
> constructed
> constructed
> constructed
> constructed
> constructed
> constructed
> constructed
> constructed
> constructed
> constructed
> constructed
> failed at 16
> java.lang.NoClassDefFoundError: InstanceTest/7572081
> at sun.reflect.GeneratedConstructorAccessor3.newInstance(Unknown Source)
> at 
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:539)
> at java.lang.Class.newInstance0(Class.java:372)
> at java.lang.Class.newInstance(Class.java:325)
> at 
> test.com.gs.s4j.misc.AnonymousClassLoading.testLoading(AnonymousClassLoading.java:47)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:623)
> at junit.framework.TestCase.runTest(TestCase.java:164)
> at junit.framework.TestCase.runBare(TestCase.java:130)
> at junit.framework.TestResult$1.protect(TestResult.java:106)
> at junit.framework.TestResult.runProtected(TestResult.java:124)
> at junit.framework.TestResult.run(TestResult.java:109)
> at junit.framework.TestCase.run(TestCase.java:120)
> at 
> org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
> at 
> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> at 
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
> at 
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
> at 
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
> at 
> org.eclipse.pde.internal.junit.runtime.RemotePluginTestRunner.main(RemotePluginTestRunner.java:62)
> at 
> org.eclipse.pde.internal.junit.runtime.CoreTestApplication.run(CoreTestApplication.java:23)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:623)
> at 
> org.eclipse.equinox.internal.app.EclipseAppContainer.callMethodWithException(EclipseAppContainer.java:574)
> at 
> org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
> at 
> org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
> at 
> org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
> at 
> org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
> at 
> org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:623)
> at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
> at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
> at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
> at org.eclipse.equinox.launcher.Main.main(Main.java:1287)
> Caused by: java.lang.ClassNotFoundException: InstanceTest.7572081
> at 
> org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:494)
> at 
> org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
> at 
> org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:398)
> at 
> org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:105)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:331)
> ... 41 more
>
>
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>
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