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
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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