Can't create Java VM [Code :- 3 ] with JNI_CreateJavaVM()

Question

hello all,
I am trying to create an inctance of JVM from C/CPP ( iam using VC++ editor) on windows. My code to create JVM is :
res = JNI_CreateJavaVM(&jvm, (void **)&env, &vm_args);
as a reasult of this call, -3 is returned to res.
please help me to create a JVM and/or call a java class from C/CPP
Thanks in advance,
Soujanya.R

Answer 1

I tried to run it this way :-
#include <jni.h>
#include <windows.h>
#define JNI_EVERSION (-3) /* JNI version error */
#define PATH_SEPARATOR ';'
#define USER_CLASSPATH "." /* where Prog.class is */
void main() {
          JNIEnv *env;
          JavaVM jvm = (JavaVM )0;
          jint res;
          jclass cls;
          jmethodID mid;
          jstring jstr;
          jobjectArray args;
          HINSTANCE hVM = NULL;
          JavaVMInitArgs vm_args;
          JavaVMOption options[4];
          printf("\noptions");
          options[1].optionString = "-Djava.class.path=C:/j2sdk1.4.1_07/jre/lib/rt.jar;E:/test/c/Debug/"; /* user classes */
          options[2].optionString = "-Djava.library.path=lib"; /* set native library path */
          options[0].optionString = "-Djava.compiler=NONE";
          //options[1].optionString = "-Djava.class.path=c:\\My Folder"; /* user classes */
          //options[2].optionString = "-Djava.library.path=C:\\j2sdk1.4.2_04\\include";
          options[3].optionString = "-verbose:jni";
          printf("\nversion info");
          vm_args.version = JNI_VERSION_1_2;
          vm_args.options = options;
          vm_args.nOptions = 4;
          vm_args.ignoreUnrecognized = TRUE;
          printf("\ncreate");
          hVM = LoadLibrary("C:/j2sdk1.4.1_07/jre/bin/client/jvm.dll");
          if (hVM == NULL)
               printf("hVM is null ");
          res = JNI_CreateJavaVM(&jvm, (void **)&env, &vm_args);
          if (res < 0) {
               fprintf(stderr, "Can't create Java VM \n",res);
               exit(1);
          cls = env->FindClass("HelloWorld");
          //cls = env.FindClass(env,"helloWorldClass");
          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();
I could run the program.
You need to have the C:\j2sdk1.4.1_07\lib\jvm.lib entries in Project->Settings->Link Tab
When you open the Settings dialog box you will see Win32Debug in the
drop down . You need to provide the entries for that page .
Then change the drop down to Win32 Release and make an entry similarly there too.
You should be able to run your code.
Vishal