用于呼叫跟踪检测的Java ASM库

Question

我正在按照本教程here进行操作，特别是第3部分：呼叫跟踪检测遇到了麻烦。我仍在尝试绕过访客模式，也许我在尝试运行此方法时出现一些错误。我的代码如下。

import java.io.FileInputStream;
import java.io.FileOutputStream;

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;

public class Copy {
    public static void main(final String args[]) throws Exception {
        FileInputStream is = new FileInputStream(args[0]);

        ClassReader cr = new ClassReader(is);
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
        cr.accept(cw, 0);

        FileOutputStream fos = new FileOutputStream(args[1]);
        fos.write(cw.toByteArray());
        fos.close();
    }

    class ClassAdapter extends ClassVisitor implements Opcodes {

    public ClassAdapter(final ClassVisitor cv) {
        super(ASM5, cv);
    }

    @Override
    public MethodVisitor visitMethod(final int access, final String name,
            final String desc, final String signature, final String[]     exceptions) {
        MethodVisitor mv = cv.visitMethod(access, name, desc, signature,     exceptions);
        return mv == null ? null : new MethodAdapter(mv);
    }
}

class MethodAdapter extends MethodVisitor implements Opcodes {

    public MethodAdapter(final MethodVisitor mv) {
        super(ASM5, mv);
    }

    @Override
    public void visitMethodInsn(int opcode, String owner, String name,     String desc, boolean itf) {
        /* System.err.println("CALL" + name); */
        mv.visitFieldInsn(GETSTATIC, "java/lang/System", "err",     "Ljava/io/PrintStream;");
        mv.visitLdcInsn("CALL " + name);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println",     "(Ljava/lang/String;)V", false);

        /* do call */
        mv.visitMethodInsn(opcode, owner, name, desc, itf);

        /* System.err.println("RETURN" + name);  */
        mv.visitFieldInsn(Opcodes.GETSTATIC, "java/lang/System", "err",     "Ljava/io/PrintStream;");
        mv.visitLdcInsn("RETURN " + name);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/io/PrintStream",     "println", "(Ljava/lang/String;)V", false);
    }
}
}

我正在像本教程的上一个示例中那样运行 javac -cp asm-all-5.0.3.jar Copy.java

我似乎无法弄清我做错了什么，也无法将错误的结果here放到更干净的外观中。