call java from native program

1. create Java VM

JavaVM *jvm = NULL;

JNIEnv *env = NULL;

JavaVMInitArgs vm_args;

JavaVMOption options[2];

args.nOptions = 2;

args.version = JNI_VERSION_1_6;

options[0].optionString = "-Xmx512m";

options[1].optionString ="-Djava.class.path=test.jar:test2.jar";

args.options = options;

#ifdef FOR_MAC_OS

setenv("JAVA_JVM_VERSION", "1.6",1);

#endif

JNI_CreateJavaVM(&jvm, (void **)&env, &args);

(2) get class & method of class

jclass aClass = (*env)->FindClass(env, "Test");

jmethodID aid = (*env)->GetStaticMethodID(env, aClass,"main","([Ljava/lang/String;)V");

(3) call method of class

jobjectArray applicationArgs;

jstring applicationArg0;

applicationArgs = (*env)->NewObjectArray(env, 1, (*env)->FindClass(env, "java/lang/String"), NULL);

applicationArg0 = (*env)->NewStringUTF(env, "Test");

(*env)->SetObjectArrayElement(env, applicationArgs, 0, applicationArg0);

(*env)->CallStaticVoidMethod(env, aClass, aid, applicationArgs);