[BCEL-info]help MethodGen

[<fa...@vo...>]

Hello,
I try to create a class from 2 different classes.
So I copy fields and methos of both in a ClassGen.
But I 've a problem with methods which use a field in the body
for example:
class A{
int a1;
A(){}
void m1(){
a1 = 2;
}
When I decompile the class that I create, instead of the method m1 there is this comment:
 // JavaClassFileOutputException: get_constant: invalid tag
Some help will be great appreciate!
Here is my code:
c1 and c2 are 2 java.lang.Class
  String nomGen = "tests/bin/gen/"
      + c1.getShortName()
   + c2.getShortName()
   + ".class";

 JavaClass clazz1 = Repository.lookupClass(c1.getName());
 JavaClass clazz2 = Repository.lookupClass(c2.getName());
 
 String nom = c1.getShortName() + C2.getShortName();
 ClassGen classGen = new ClassGen(clazz1);
 classGen.setClassName(nom);
 
 ConstantPoolGen cp = classGen.getConstantPool();
  
 Field[] tfields = clazz2.getFields();
 for (int i = 0; i < tfields.length; i++) {
  FieldGen fg = new FieldGen(tfields[i], cp);
  classGen.addField(fg.getField());
 }
 
 Method[] tmeth = clazz2.getMethods();
 for (int j = 0; j < tmeth.length; j++) {
  MethodGen mg = new MethodGen(tmeth[j], classGen.getClassName(), cp);
  classGen.getConstantPool().addNameAndType(mg.getName(), mg.getSignature());
  classGen.addMethod(mg.getMethod());
 }
 
 
 try {
     classGen.getJavaClass().dump(nomGen);
  } catch(java.io.IOException e) { System.err.println(e); }
  
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