Hi,
I've used BCEL a while ago to create **new** classes on the fly, but am
getting stuck on something I've never had to do before: Inserting
instructions to existing classes.
Im trying to wrap each method in a class with a
try/catch(NullPointerException).
So this method:
public int getInt() {
return getIntFromSomewhere();
}
would become:
public int getInt() {
try {
return getIntFromSomewhere();
}
catch(NullPointerException e) {
// do something
return 0;
}
}
Im not having much luck at the moment - my current approach is this:
1) Use the methods InstructionList.getStart() to get the first instruction
2) Use InstructionList.getEnd() to get the last instruction
3) Add exception handling code (keeping an InstructionHandler to the first
instruction in the handling code)
4) Add an appropriate return (using InstructionFactory.createNull ) if
return type is not void
5) Add an exception handler to the method, using start and end obtained from
1/2 above, and the instruction handle obtained in 3 as the exception
handling code handle
Does this seem like a reasonable approach? Currently the methods produced
seem to be completely mangled - so Im guessing Im way out on something -
maybe one of my assumptions above.
Any advice would be greatly appreciated!
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