InstructionList.getStart() returns null

Hello!
I am using BCEL to instrument class code in a thread migration system. It
needs to insert GOTO instructions but I cannot get the target
InstructionHandler. I have tried more ways. For example:

InstructionList il = mg.getInstructionList(); // mg is a MethodGen
initialized with a method of the class
InstructionHandle ih = il.getStart(); // returns null; WHY?

Also:

InstructionHandle ih = il.findHandle(index); // index surely exists within
InstructionList, still returns null; WHY?

Maybe I have a wrong approach? What is a proper way to get the handle for an
instruction that already exists in InstructionList?

Thank you very much!
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