Hi
My experience is that the error you are getting is it because some
method code has an invalid stack, in this case you are removing too many
items from the stack, the verifier is picking this up and reporting the
error. I'm not sure but perhaps some code doesn't call
MethodGen.setMaxStack() after transforming, although I doubt it, because
if the code were otherwise correct it should have complained of a stack
overflow.
The problem has to be with the method it is verifying at the time so if
you can print out which method the verifier is working on and it's
bytecodes you could go through it and find the problem. The bytecode
pre-transformation by BCEL should be correct so the problem lies with
the transformations your code performs.
I'm don't know why this should be a problem with 1.5 and not 1.4.
Hope it helps
Bye Arrin
Razvanica wrote:
Hello all,
Here's my problem. I am trying to make some network simulations using a tool
called JiST/SWANS. This simulator has been written for Java 1.4 and, for my
simulations, I would like to use some 1.5 features, like genericity.
So what I am trying to do is to compile the original code with the "source
-1.5" tag instead of the "source -1.4" tag. The problem is that the
simulator uses bcel to rewrite the bytecode so that JVM could be used for
simulations. The bcel library in the release doesn't work with the "source
-1.5" tag so I replace it with bcel-5.2. I made 2 minor modifications to the
original code :
- I have added an implementation of getClassPath in a class that implements
org.apache.bcel.util.Repository. This class just returns null, just like in
org.apache.bcel.util.ClassLoaderRepository
- In a class using org.apache.bcel.Repository.lookupClass() I am now
throwing java.lang.ClassNotFoundException
These 2 modifications shouldn't change anything as far as I understand the
application. And when I compile the new code with the "-source 1.4" tag, it
doesn,t change anything. Everything compiles and works just fine. However,
when I compile the new code with the "-source 1.5" tag the compilation goes
smoothly, but, at runtime, the rewriter throws an
ArrayIndexOutOfBoundsException.
This happens every time org.apache.bcel.generic.PUTFIELD.accept is called:
java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.remove(ArrayList.java:390)
at
org.apache.bcel.verifier.structurals.OperandStack.pop(OperandStack.java:135)
at
org.apache.bcel.verifier.structurals.ExecutionVisitor.visitPUTFIELD(ExecutionVisitor.java:1048)
at org.apache.bcel.generic.PUTFIELD.accept(PUTFIELD.java:78)
Does anybody have any idea what happens and if there's something I could do
to fix this?
Thank you.
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