Question

The third argument of the method JNI_CreateJavaVM takes the third argument as JavaVMInitArgs structure.

typedef struct JavaVMInitArgs { 
                     jint version; 
                     jint nOptions; 
                     JavaVMOption *options; 
                     jboolean ignoreUnrecognized; 
                 } JavaVMInitArgs;

How do i initialize this ? I am unable to do so.

Prototype of JNI_CreateJavaVM: jint JNI_CreateJavaVM(JavaVM **pvm, void **penv,
void *vm_args);

How do i initialize vm_args ?

Answer 1

After some discussion we came to the conclution that you had problems with your compiler setup.

To be able to successfully compile and link JNI_CreateJavaVM you need to add the jvm library to your linker.

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Initial answer:

Looking at The Invocation API the following example might explain what you need to do:

JavaVMInitArgs vm_args;
JavaVMOption options[4];

options[0].optionString = "-Djava.compiler=NONE";           /* disable JIT */
options[1].optionString = "-Djava.class.path=c:\myclasses"; /* user classes */
options[2].optionString = "-Djava.library.path=c:\mylibs";  /* set native library path */
options[3].optionString = "-verbose:jni";                   /* print JNI-related messages */

vm_args.version = JNI_VERSION_1_2;
vm_args.options = options;
vm_args.nOptions = 4;
vm_args.ignoreUnrecognized = TRUE;

/* Note that in the JDK, there is no longer any need to call 
 * JNI_GetDefaultJavaVMInitArgs. 
 */
res = JNI_CreateJavaVM(&vm, (void **)&env, &vm_args);
if (res < 0) ...