Get java.lang.IllegalAccessError when accessing the private field of a outside class via ASM Java Bytecode

Hi, I want to replace reflection code with ASM to access the private field of
an outside class for performance improvement. In reflection , the private field
can be access via getDeclaredField() and setAccessible(true). How to access the
private field of a outside class via Objectweb ASM bytecode API? I set to get
the private field from something like, via

Field current = sourceObject.getDeclaredField(privateFieldName);
Field.setAccessible(true);
Type sourceType = Type.getType(sourceObject.getClass());
mv.visitFieldInsn(Opcodes.GETFIELD,
		  sourceType.getInternalName(),
		  privateFieldname,
		  Type.getDescriptor(current.getType()));
When the byte code is executed and to get the private field, I always got an
error "java.lang.IllegalAccessError "

Is there any standard way to access/get the value fro ma private field of an
outside class? Thanks a bundle,

E

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