C 애플리케이션에서 Java 메소드를 어떻게 호출할 수 있습니까?

#include <jni.h>
#include <stdio.h>

int main() {
    JavaVM *vm;
    JNIEnv *env;
    JavaVMInitArgs vm_args;
    vm_args.version = JNI_VERSION_1_2;
    vm_args.nOptions = 0;
    vm_args.ignoreUnrecognized = 1;

    // Construct a VM
    jint res = JNI_CreateJavaVM(&vm, (void **)&env, &vm_args);

    // Construct a String
    jstring jstr = env->NewStringUTF("Hello World");

    // Find the class and method
    jclass clazz = env->FindClass("java/lang/String");
    jmethodID to_lower = env->GetMethodID(clazz, "toLowerCase", "()Ljava/lang/String;");

    // Call the method
    jobject result = env->CallObjectMethod(jstr, to_lower);

    // Get the C-style string
    const char *str = env->GetStringUTFChars((jstring)result, NULL);

    printf("%s\n", str);

    // Clean up
    env->ReleaseStringUTFChars(jstr, str);
    vm->DestroyJavaVM();
    return 0;
}

g++ -I/usr/lib/jvm/java-6-sun/include -I/usr/lib/jvm/java-6-sun/include/linux -L/usr/lib/jvm/java-6-sun/jre/lib/i386/server/ -ljvm jnitest.cc