Problem with generating method

i succeded in creating main method, and constructor
but now i need to create new static method
suppose i want do method:
static public f(int x, int y)
{
return x*y;
}

based on my experience with other methods i wrote:

mv = cw.visitMethod( Opcodes.ACC_PUBLIC+Opcodes.ACC_STATIC, 
f,"(II)I",null,null); 
mv.visitCode();
mv.visitVarInsn(Opcodes.ILOAD, 0);
mv.visitVarInsn(Opcodes.ILOAD, 1);
mv.visitInsn(Opcodes.IMUL);
mv.visitInsn(Opcodes.RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();

disassebled code for this method is looks exactly as that one created from
source code
bur when i try run class (without using that method)
a get
(class: myClass, method: f signature (II)I)  Wrong return type in function
can somebody tells me whad did i miss
regards

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