Re[2]: Invalid constant pool reference: 28088. Constant pool size is: 1024

[Konstantin Scheglov <sc...@nlmk.ru>]

Hello Simon,

Wednesday, June 11, 2003, 6:52:25 PM, you wrote:

SB> I'm no BCEL guru, but I used it for a while a few weeks back, so maybe I
SB> can help you.
  Would be great. :-)

SB> I think the problem must come from the few operations you says you do, 
SB> but that don't show up on the listing you sent ... Maybe you could send 
SB> the whole thing.
  No, problem appears even when I don't modify method. I.e. when I use
code in initial mail.

SB> Maybe one thing, I think you need to call classGen.update() once you 
SB> changed the method ... But I don't think this will be the cause of your 
SB> problem.
  Yes, just tryed - still same exception.

  Here is archive with class. Name of class is broken, but I don't
think, that this is reason of exception.

section 1 of uuencode 5.25 of file clazz.zip    by R.E.M.

sum -r/size 64782/3098 section (from "begin" to "end")
sum -r/size 25249/2228 entire input file


SB> Simon.

SB> Konstantin Scheglov wrote:

>>  I use following code to instrument one class.
>>  But when I instrument some classes and try to print debug
>>information, I receive following exception.
>>
>>org.apache.bcel.classfile.ClassFormatException: Invalid constant pool reference: 28088. Constant pool size is: 1024
>>        at org.apache.bcel.classfile.ConstantPool.getConstant(ConstantPool.java:242)
>>        at org.apache.bcel.classfile.Utility.codeToString(Utility.java:369)
>>        at org.apache.bcel.classfile.Utility.codeToString(Utility.java:166)
>>        at org.apache.bcel.classfile.Code.toString(Code.java:326)
>>        at org.apache.bcel.classfile.Code.toString(Code.java:352)
>>        at java.lang.String.valueOf(String.java:2131)
>>        at java.io.PrintStream.print(PrintStream.java:462)
>>        at java.io.PrintStream.println(PrintStream.java:599)
>>        at ru.nlmk.eclipse.plugins.profiler.trace.Trace.instrumentClass(Trace.java:1190)
>>        at ru.nlmk.eclipse.plugins.profiler.trace.test.TestBCEL.main(TestBCEL.java:23)
>>
>>
>> As you can see, I just copy code from one method to another (in real application
>>I change code a little). And when I try to load this class in real application
>>I receive exception like this from JVM:  "VerifyError: Illegal constant pool index".
>>
>>
>>        public static JavaClass instrumentClass(JavaClass clazz) throws Exception {
>>                ClassGen classGen = new ClassGen(clazz);
>>                ConstantPoolGen cp = new ConstantPoolGen(clazz.getConstantPool());
>>                classGen.setConstantPool(cp);
>>                //
>>                for (int i = 0; i < clazz.getMethods().length; i++) {
>>                        Method method = clazz.getMethods()[i];
>>                        if (method.isAbstract() || method.isNative())
>>                                continue;
>>                        if (method.getName().equals("finalize"))
>>                                continue;
>>                        MethodGen mg = new MethodGen(method, clazz.getClassName(), cp);
>>                        mg.setConstantPool(cp);
>>                        Method newMethod = mg.getMethod();
>>                        if (m_Debug) {
>>                                System.out.println(method.getCode());
>>                                System.out.println(newMethod.getCode());
>>                        }
>>                        classGen.replaceMethod(method, newMethod);
>>                }
>>                //
>>                JavaClass newClazz = classGen.getJavaClass();
>>                newClazz.setConstantPool(cp.getFinalConstantPool());
>>                return newClazz;
>>        }
>>
>>  What I do wrong?
>>  I see such exception only on few classes (methods).
>>  I have example of such class.
>>        
>>
>>  
>>


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-- 
Best regards,
 Konstantin                            mailto:scheglov_ke@nlmk.ru