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.
--
Best regards,
Konstantin mailto:[EMAIL PROTECTED]
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