Re: inner class problem

Hi,

uups replied to the wrong mail.

obviously the following verifier call leads to a non instrumented inner
class sometimes. I fixed a little bug in my instrumentation code. The
example from my previous mail now works properly. But in a more complex
scenario I still have a problem. If I add a call to the internal asm
verifier the inner class is just not instrumented. If I leave it out,
the example works - i.e. the Java verifier obviously does not have any
problems with the bytecode. Any ideas where this bug might come from?

// add byte code verifier
StringWriter stringWriter = new StringWriter();
CheckClassAdapter.verify(new ClassReader(classWriter.toByteArray()),
false, new PrintWriter(stringWriter));
         if (stringWriter.getBuffer().length() > 0) {
            logger.severe(stringWriter.toString());   
         }


Nikolas

Am Do 09.12.2010 17:33 schrieb Nikolas Nehmer
<[email protected]>:

>Hi all,
>
>I have a problem regarding the following example:
>
>public class Demo2 {
>
>InnerClass i;
>int x;
>
>Demo2() {
>i = new InnerClass();
>}
>
>public static void main(String[] args) {
>Demo2 demo = new Demo2();
>}
>
>class InnerClass {
>
>InnerClass() {
>}
>}
>}
>
>
>My instrumentation adds some logging calls, i.e. in case of variable
>assignments like i = new InnerClass(); it calls a static logging
>facility. So far so good, but ins this special case, the inner class is
>just not instrumented. I'm using load-time instrumentation based on a
>Java agent. If I just add some debug System.out.printlns to the agent
>(instead of the instrumentation calls), either Demo2 and
>Demo2$InnerClass are passed to the agent. If I add the instrumentation,
>only the outer class is instrumented, the inner class is not even
>passed
>to the agent! Nevertheless the app is running - i.e. Demo2 is
>instantiated, the inner class is instantiated and for the outer class
>my
>logging calls are executed. The application terminates normally.
>To sumarize:
>- The instrumented app runs without exception!
>- For the outer class the instrumentation works! i.e. for i = new
>InnerClass(); a logging call is added
>- For the inner class there is NO call to the agent's transform(...)
>method!
>
>Any ideas why the transform method might not be called for the inner
>class?
>
>Btw. the following example works completely!!! The only difference is
>splitting up the example in two classes!
>
>public class Demo {
>public static void main(String[] args) {
>MyComponent comp = new MyComponent();
>}
>}
>
>public class MyComponent {
>InnerClass i;
>
>public MyComponent() {
>i = new InnerClass();
>}
>
>static class InnerClass {}
>}
>
>
>Best regards
>Nikolas
>
>--
>Dipl.-Inf. Nikolas Nehmer,
>Dept. of Computer Science. University of Kaiserslautern
>P.O. Box 3049, 67653 Kaiserslautern, Germany.
>room 36/308, phone: +49 (0) 631 - 205 2644, fax: +49 (0) 631 - 205 3299
>mail: [email protected]
>

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