Работаем с нативками

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class JNIInvoker */
 
#ifndef _Included_JNIInvoker
#define _Included_JNIInvoker
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     JNIInvoker
 * Method:    nativeGetMy
 * Signature: ([Ljava/lang/String;)Ljava/util/Vector;
 */
JNIEXPORT jobject JNICALL Java_JNIInvoker_nativeGetMy
  (JNIEnv *, jclass, jobjectArray);
 
#ifdef __cplusplus
}
#endif
#endif

#include <jni.h>
#include "JNIInvoker.h"
/*
 * Class:     JNIInvoker
 * Method:    nativeGetMy
 * Signature: ([Ljava/lang/String;)Ljava/util/Vector;
 */
JNIEXPORT jobject JNICALL Java_JNIInvoker_nativeGetMy
(JNIEnv *env, jclass jc, jobjectArray ja) {
// C стиль вызовов
    jsize stringCount = (*env).GetArrayLength(ja);
    jclass retclazz = (*env).FindClass("java/util/Vector");
    jobject ret = (*env).NewObject(retclazz, (*env).GetMethodID(retclazz, "<init>", "()V"));
// C++ стиль вызовов
    jclass myclazz = env->FindClass("MyClass");
    for (int i = 0; i < stringCount; i++) {
        jstring str = (jstring) env->GetObjectArrayElement(ja, i);
        jobject myobj = env->NewObject(myclazz, env->GetMethodID(myclazz, "<init>", "()V"));
        jmethodID setS = env->GetMethodID(myclazz, "setS", "(Ljava/lang/String;)V");
        env->CallVoidMethod(myobj, setS, str);
        jmethodID add = env->GetMethodID(retclazz, "add", "(Ljava/lang/Object;)Z");
        env->CallVoidMethod(ret, add, myobj);
    }
    return ret;
}