FATAL ERROR in native method: Wrong Method ID

Question

I have a piece of C code from which I am trying to launch a piece of Java, but I am having severe problems just trying to get a simple integer value returned from any Java function. I keep getting the error message "FATAL ERROR in native method: Wrong method ID used to invode a Java method"
My C code looks like :
JNIEnv *env;
long result;
jmethodID mid;
jclass cls;
jobjectArray args;
jstring jstr;
jint res;
jobject myObj;
options[0].optionString = "-Djava.class.path=.";
options[1].optionString = "-Djava.compiler=NONE";
options[2].optionString = "-verbose:jni";
vm_args.version = JNI_VERSION_1_2;
vm_args.options = options;
vm_args.nOptions = 2;
vm_args.ignoreUnrecognized = JNI_FALSE;
// Create the Java VM
result = JNI_CreateJavaVM(&jvm,(void **)&env, &vm_args);
if (result == JNI_ERR )
printf("Can't create Java VM\n");
exit(1);
else
printf("Java VM created successfully\n");
cls = (*env)->FindClass(env, "Example1");
if (cls == 0){
printf("Can't find Class\n");
exit(1);
else
printf("Class Found\n");
mid = (*env)->GetMethodID(env, cls, "GetIntValue", "()I" );
if (mid == 0) {
printf("Can't find function\n");
exit(1);
else
printf("Function Found\n");
res = (*env)->CallIntMethod(env, cls, mid);
if (res != 0)
char pszTempString[256] = {'\0'};
sprintf (pszJavaString, "Returned from Java the value of %d", res);
printf("Returned from Java with ");
printf(pszJavaString);
My GetMethodID call works correctly and I have checked the signature (using javap -s) and that works fine. I've seen many references on these forums about using NewObject prior to calling CallIntMethod, but if I try to use that I then get the error message "FATAL ERROR in native method: a non-constructor passed to NewObject".
Any body got any ideas please.
Thanks

Answer 1

What I couldn't figure out from your code is where you create the java object that is supposed to return the integer to your C code.
Alternatives:
o This is just code snippets, and you really are creating the object.
o Error - the object should have been created.
o Error - it is a static method, and you should be finding a static method and calling it on a class object.
(Other than that, I didn't see anything obviously wrong.