#9045294
пятница, 18 ноября 2016 11:30 dalibor topic <[email protected]>
писал(а):
Hi Mihail,
could you file an issue at bugs.java.com and let us know which incident
id you receive, please?
cheers,
dalibor topic
On 14.11.2016 10:58, Михаил Богданов wrote:
> JDK 8 incorrectly processes nameless (name=null) parameters in
> MethodParameters attribute. Actually problem in inconsistency between Hotspot
> and reflection:
> Hotspot VM constructs nameless parameter with empty string name that cause
> Executable.verifyParameters to throw MalformedParametersException.
> //Code to reproduce:import jdk.internal.org.objectweb.asm.ClassWriter;
> import jdk.internal.org.objectweb.asm.MethodVisitor;
> import jdk.internal.org.objectweb.asm.Opcodes;
>
> import java.lang.reflect.Method;
> import java.net.URL;
> import java.net.URLClassLoader;
>
> public class Bug {
>
> public static void main(String[] args) throws ClassNotFoundException,
>NoSuchMethodException {
> ClassWriter writer = new ClassWriter(Opcodes.ASM5);
> writer.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC | Opcodes.ACC_INTERFACE
>| Opcodes.ACC_ABSTRACT, "Test", null, "java/lang/Object", null);
> MethodVisitor test = writer.visitMethod(Opcodes.ACC_PUBLIC |
>Opcodes.ACC_ABSTRACT, "test", "(I)V", null, null);
> test.visitParameter(null, 0);
> test.visitEnd();
>
> writer.visitEnd();
> final byte[] bytes = writer.toByteArray();
>
> URLClassLoader urlClassLoader = new URLClassLoader(new URL[0],
>ClassLoader.getSystemClassLoader()) {
> @Override
> protected Class<?> findClass(String name) throws
>ClassNotFoundException {
> if (name.equals("Test")) {
> return defineClass("Test", bytes, 0, bytes.length);
> }
> return super.findClass(name);
> }
> };
>
>
> Class<?> clazz = urlClassLoader.loadClass("Test");
> Method method = clazz.getDeclaredMethod("test", Integer.TYPE);
> // Exception in thread "main"
> java.lang.reflect.MalformedParametersException: Invalid parameter name ""
> // at
> java.lang.reflect.Executable.verifyParameters(Executable.java:386)
> // at
> java.lang.reflect.Executable.privateGetParameters(Executable.java:416)
> // at java.lang.reflect.Executable.getParameters(Executable.java:357)
> // at Bug.main(Bug.java:37)
> method.getParameters();
> }
> }
> Best regards, Max
>
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