JVM help

Question

hello,
I am trying to get the hang of this JNI and JVM stuff...killing me.
I am trying to get a C++ application to interrupt a java program that is in idle or just have it interrupt a certain thread then I can have the java application do something.
I've tried JNI but with that it is really tough (i think, not sure), if at all possible, to get the interruption I want...
So, I was thinking that JVM could do something of that nature. By putting JVM in the C++ I could call the java methods i want to when I want to. I found this bit of code online and when I go to compile it it throws these errors>>
testingJVM.obj : error LNK2001: unresolved external symbol [email protected] : error LNK2001: unresolved external symbol __imp__JNI_GetDefaultJavaVMInitArgs@4
Debug/testingJVM.exe : fatal error LNK1120: 2 unresolved externals
I amguessing that it can not find where the JNI_CreateJavaVM method is located or they are not linked.
If anyone could help me I would be grateful..thanks
//////////////Java Code/////////////////
package jvmtester;
public class testing {
public testing() {
public static void main(String[] args) {
System.out.println("Hello World from Java!!");
testing testing1 = new testing();
}//end java
////////////////C++ CODE/////////////////
void CTestingJVMApp::mainTest() {
JNIEnv *env;
JavaVM *jvm;
JDK1_1InitArgs vm_args;
jint res;
jclass cls;
jmethodID mid;
jstring jstr;
jobjectArray args;
char classpath[1024];
/* IMPORTANT: specify vm_args version # if you use JDK1.1.2 and beyond */
vm_args.version = 0x00010001;
JNI_GetDefaultJavaVMInitArgs(&vm_args);
/* Append USER_CLASSPATH to the end of default system class path */
sprintf(classpath, "%s%c%s",
vm_args.classpath, PATH_SEPARATOR, USER_CLASSPATH);
vm_args.classpath = classpath;
/* Create the Java VM */
res = JNI_CreateJavaVM(&jvm,(void**)&env,&vm_args);
if (res < 0) {
fprintf(stderr, "Can't create Java VM\n");
exit(1);
cls = env->FindClass("Prog");
if (cls == 0) {
fprintf(stderr, "Can't find Prog class\n");
exit(1);
mid = env->GetStaticMethodID(cls, "main", "([Ljava/lang/String;)V");
if (mid == 0) {
fprintf(stderr, "Can't find Prog.main\n");
exit(1);
jstr = env->NewStringUTF(" from C!");
if (jstr == 0) {
fprintf(stderr, "Out of memory\n");
exit(1);
args = env->NewObjectArray(1,
env->FindClass("java/lang/String"), jstr);
if (args == 0) {
fprintf(stderr, "Out of memory\n");
exit(1);
env->CallStaticVoidMethod(cls, mid, args);
jvm->DestroyJavaVM();

Answer 1

http://java.zu5.net explains it very well