[BCEL-info]help MethodGen and constantPool

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

Hello,
I want to create a class from 2 different classes.

I begin just to create a classe from an existing classe using ClassGen and MethodGen
and copying its fields and its methods in the ClassGen.
When I add method to the ClassGen, the constant pool don't correspond.
References used in the added method are not the good one in the constant pool.
How can I make the constant pool right?
You can see above the instructions list for the method and the constant pool
for the class C1:
package p3;
class A {
 
 int a1;
 
 A() {
  a1 = 1;
 }
 
 public void paint(){
 }
}
-------------------------------------------
Methods ... 
void <init>()
list inst  : <init>
   0: aload_0[42](1)
   1: invokespecial[183](3) 11
   4: aload_0[42](1)
   5: iconst_1[4](1)
   6: putfield[181](3) 13
   9: return[177](1)
public void paint()
list inst  : paint
   0: return[177](1)
constant pool ... 
1)CONSTANT_Utf8[1]("AB")
2)CONSTANT_Class[7](name_index = 1)
3)CONSTANT_Utf8[1]("java/lang/Object")
4)CONSTANT_Class[7](name_index = 3)
5)CONSTANT_Utf8[1]("a1")
6)CONSTANT_Utf8[1]("I")
7)CONSTANT_NameAndType[12](name_index = 5, signature_index = 6)
8)CONSTANT_Fieldref[9](class_index = 2, name_and_type_index = 7)
9)CONSTANT_Utf8[1]("<init>")
10)CONSTANT_Utf8[1]("()V")
11)CONSTANT_NameAndType[12](name_index = 9, signature_index = 10)
12)CONSTANT_Methodref[10](class_index = 2, name_and_type_index = 11)
13)CONSTANT_Utf8[1]("this")
14)CONSTANT_Utf8[1]("Lp3/A;")
15)CONSTANT_Utf8[1]("LocalVariableTable")
16)CONSTANT_Utf8[1]("LineNumberTable")
17)CONSTANT_Utf8[1]("Code")
18)CONSTANT_Utf8[1]("paint")
19)CONSTANT_NameAndType[12](name_index = 18, signature_index = 10)
20)CONSTANT_Methodref[10](class_index = 2, name_and_type_index = 19)
---------------------------------------
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 is a java.lang.Class
 public void integre() {
  String nomGen = "tests/bin/gen/"
      + C1.getName()
   + "_.class";
  
 JavaClass clazz1 = Repository.lookupClass(c1.getCl().getName());
     ClassGen        cg1 = new ClassGen(clazz1);
     ConstantPoolGen cp1 = cg1.getConstantPool();
     
 String nom = C1.getName() + "_.class";
 ClassGen _cg = new ClassGen(nom,
    "java.lang.Object",
    null, 
    Constants.ACC_PUBLIC, 
    null); 
  
 ConstantPoolGen _cp = _cg.getConstantPool();
  
 System.out.println("Fields ... ");
  
 Field[] tfields = cg1.getFields();
 for (int i = 0; i < tfields.length; i++) {
  FieldGen fg = new FieldGen(tfields[i], _cp);
  _cg.addField(fg.getField());
  _cp.addFieldref(_cg.getClassName(),fg.getName(),fg.getSignature());
  _cp.addNameAndType(fg.getName(), fg.getSignature());
 }
  
 System.out.println("Methods ... ");
      Method[] methods = cg1.getMethods();
      for (int j=0; j< methods.length; j++) {
          MethodGen m =  new MethodGen(methods[j],
             _cg.getClassName(),
                                       _cp);
         _cp.addMethodref(m);
         _cp.addNameAndType(m.getName(), m.getSignature());
         _cg.addMethod(m.getMethod());
      }      
   
      JavaClass c3 = _cg.getJavaClass();
      c3.setConstantPool(_cp.getFinalConstantPool());
 try {
    c3.dump(nomGen);
  } catch(java.io.IOException e) { System.err.println(e); }
 }
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