Problem when creating a local variable in a method

Hi All,
	
	I am new to BCEL. Just started using it. I had a problem with
local variable insertion to a method dynamically. 
	I tried to find in internet resoruces , but could not, could you
please help me in this regard.

	I am trying to open the modified class with decompiler, a dialog
appears, when decompiling saying 
			The instruction at "0x..." reference memory at
"...". The memory could not be read.

	however a jad is created, in which all the methods starting from
the modified method no more appear in the class file, i.e methods are
gettign 	corrupted.

	Please have a look at the following code[1] and please correct
me..

	should I do some updations to local variable table after
insertion of a local variable or is it automatically updated ????

	please help me in this regard.

Thank you 
Reddy


	class A{

		public Method instr( JavaClass javaClass, 
                                    Method method, 
						ConstantPoolGen poolGen,

						InstructionFactory
factory ) {

		MethodGen mgen = new MethodGen(method,
javaClass.getClassName(), poolGen);

		InstructionList ilist = mgen.getInstructionList();
		InstructionList ilist_start = new InstructionList();
		insertStaticCallAtEntry(mgen, poolGen, factory,
ilist_start, methodName);

		InstructionHandle ihss = ilist.insert( ihandle_start,
ilist_start);
	      ilist.redirectBranches( ihandle_start, ihss); 
		mgen.setMaxStack();
		return mgen.getMethod();
		}

		private void insertStaticCallAtEntry( MethodGen mgen
                                         , ConstantPoolGen poolGen 
                                         , InstructionFactory factory
                                         , InstructionList ilist_start 
                                         , String method_call) {
        
	
ilist_start.append(factory.createInvoke(NAME_OF_CLASS_CONTAINER,
method_call, Type.VOID,
                                            new Type[]{},
Constants.INVOKESTATIC));

      	  LocalVariableGen localVar= mgen.addLocalVariable("obj",new
ObjectType("java.lang.Object"), null, null);
        
	        int obj = localVar.getIndex();
        
      	  Tracer.trace("index is "+ obj);

	        localVar.setStart(ilist_start.append(new ASTORE(obj)));

	    } 

	}