DO NOT REPLY [Bug 48279] New: "Invalid method signature: TT;" when using MethodGen for a method having a generic parameter

https://issues.apache.org/bugzilla/show_bug.cgi?id=48279

           Summary: "Invalid method signature: TT;" when using MethodGen
                    for a method having a generic parameter
           Product: BCEL
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P2
         Component: Main
        AssignedTo: [email protected]
        ReportedBy: [email protected]


The following code throws a "ClassFormatException: Invalid method signature:
TT;" when executed:
===========================================================

import org.apache.bcel.Repository;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Method;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.MethodGen;

class MyClassLoader extends ClassLoader {
    @Override
    public Class<?> loadClass(String name) throws ClassNotFoundException {
        if (name.startsWith("java.lang"))
            return super.loadClass(name);

        JavaClass jcl;
        jcl = Repository.lookupClass(name);
        scanMethods(jcl);
        byte[] data = jcl.getBytes();
        return defineClass(name, data, 0, data.length);
    }

    private void scanMethods(JavaClass jcl) {
        ConstantPoolGen cpg = new ConstantPoolGen(jcl.getConstantPool());
        Method[] methods = jcl.getMethods();
        for (int i = 0; i < methods.length; i++) {
            MethodGen mg = new MethodGen(methods[i], jcl.getClassName(), cpg);
        }
    }
}

class Foo<T> {
    public void bar(T x) {
    }
}

public class MethSignTest {
    public MethSignTest() {
        Foo<Integer> foo = new Foo<Integer>();
    }

    @SuppressWarnings("unchecked")
    public static void main(String[] args) {
        try {
            MyClassLoader mcl = new MyClassLoader();
            Class<MethSignTest> c = (Class<MethSignTest>) mcl
                    .loadClass(MethSignTest.class.getName());
            c.newInstance();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}
===========================================================

Here's the full stack trace:

org.apache.bcel.classfile.ClassFormatException: Invalid method signature: TT;
    at org.apache.bcel.classfile.Utility.typeOfSignature(Utility.java:986)
    at org.apache.bcel.generic.Type.getType(Type.java:169)
    at org.apache.bcel.generic.MethodGen.<init>(MethodGen.java:255)
    at methodsignature.MyClassLoader.scanMethods(MethSignTest.java:26)
    at methodsignature.MyClassLoader.loadClass(MethSignTest.java:17)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
    at methodsignature.MethSignTest.<init>(MethSignTest.java:38)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:501)
    at java.lang.Class.newInstance0(Class.java:350)
    at java.lang.Class.newInstance(Class.java:303)
    at methodsignature.MethSignTest.main(MethSignTest.java:47)

This misbehaviour occurs at least since revision 617860.

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