I keep getting an illegal instruction exception when a
breadpoint is
reached. Basically I have just constructed a simple class that uses JNI to set
the event hook
and to set a breakpoint. However, when I make a call to the method with
containing the break
point, I get the illegal instruction error. Any thoughts on what might be
happenning? Am I doing
something stupid here?

I am running the program using:

    java com.javix.debugger.Break

Thanks for your help,

Bryan

******************************************

Here is the Java code:

package com.javix.debugger;

public class Break
{

    public native boolean setBreakPoint();

    static {
         try {
               System.loadLibrary ("break");
         } catch (Exception e) {
               System.err.println ("could not load library");
         }
    }

    public static void main (String[] args)
    {
           Break b = new Break();
           b.setBreakPoint();
           b.foo();
    }

    public void foo()
    {
           return;
    }

}


And here is the c code for the native method setBreakPoint:

#include <jni.h>
#include <jvmdi.h>
#include "com_javix_debugger_Break.h"

void EventHook (JNIEnv *env, JVMDI_Event *event)
{
    printf ("got event");
}

void showError (jvmdiError error)
{
    switch (error) {
    case JVMDI_ERROR_NONE:
        printf ("no error\n");
        break;
    case JVMDI_ERROR_NULL_POINTER:
        printf ("null pointer\n");
        break;
    case JVMDI_ERROR_INVALID_METHODID:
        printf ("invalid method\n");
        break;
    case JVMDI_ERROR_INVALID_CLASS:
       printf ("invalid class\n");
       break;
    case JVMDI_ERROR_INVALID_LOCATION:
       printf ("invalid location\n");
       break;
    case JVMDI_ERROR_DUPLICATE_BREAKPOINT:
      printf ("duplicate breakpoint\n");
      break;
    case JVMDI_ERROR_VM_DEAD:
      printf ("vm dead\n");
      break;
    case JVMDI_ERROR_OUT_OF_MEMORY:
      printf ("out of memory\n");
      break;
    }
}


JNIEXPORT jboolean JNICALL Java_com_javix_debugger_Break_setBreakPoint (JNIEnv
*env, jobject obj)
{
    jmethodID method;
    jclass clazz = (*env)->FindClass (env, "com/javix/debugger/Break");
    if (!clazz)
         printf ("could not find class\n");
    method = (*env)->GetMethodID (env, clazz, "foo", "()V");
    if (!method)
         printf ("could not find method\n");
    showError(JVMDI_SetEventHook (env, EventHook));
    showError(JVMDI_SetBreakpoint (env, clazz, method, 0));
    return 0;
}