Error occured when sending message through Google Play Game Service with Cocos2d-x - c++

Question

I'm developing a multiplayer game with Google Play Services and Cocos2d-x. I already set up communication between Java and C++ using JNI, and can run processes like Sign-in, Create room, Invitation... Everything is fine until I need to send some struct to another players. When receive data from other, an error has occurred.
Here's the structs:
typedef enum
{
MESSAGE_TYPE_PING = -1,
MESSAGE_TYPE_PING_BACK = 0,
MESSAGE_TYPE_RTT = 3
} MESSAGE_TYPE;
typedef struct
{
MESSAGE_TYPE messType;
} MESSAGE;
typedef struct
{
MESSAGE mess;
timeval sendTime;
const char* text;
} PING_MESSAGE;
And in this code snippet I convert struct and send it to another players:
void MyClass::sendData()
{
// Send package
PING_MESSAGE ping;
ping.mess.messType = MESSAGE_TYPE_PING;
ping.sendTime = startTime;
ping.text = "Ohhhhhh";
char byte[sizeof(ping)];
memcpy(byte, &ping, sizeof(ping));
GCHelper::sendReliableRealTimeMessage(&byte[0]);
}
// In GCHelper's implementation
void GCHelper::sendReliableRealTimeMessage(const char* byteMess)
{
// Convert char* to jbyteArray
jbyteArray bArray = env->NewByteArray(16); //env is a static JNIEnv* in this class; 16 since my PING_MESSAGE struct is 16 bytes in size;
env->SetByteArrayRegion(bArray,0,16,(jbyte*)byteMess);
// Make Java call
env->CallStaticVoidMethod(classID, methodID, bArray);
methodInfo.env->DeleteLocalRef(bArray);
methodInfo.env->DeleteLocalRef(classID);
}
Now, Java code take responsibility to send the byte array to participants in room. At receiver side, I'm continue send received data to C++. And error occured here when I convert jbyteArray back to struct:
void Java_package_name_TestMulti_nativeOnRealTimeMessageReceived(JNIEnv *env, jobject thiz, jbyteArray receivedMess)
{
CCLOG("Called from java");
jboolean isCopy;
jbyte * pCData = env->GetByteArrayElements(receivedMess, &isCopy);
jsize size = env->GetArrayLength(receivedMess);
const char* sd = (const char*)pCData;
PING_MESSAGE result;
memcpy(&result, sd, sizeof(result));
CCLOG("TEST size: %d", size); // This log out: "TEST size: 16"
CCLOG("TEST type: %d", result.mess.messType); // This log out: "TEST type: -1"
CCLOG("TEST text: %s", result.text); // AND ERROR!!!!!!!
cocos2d::CCByteArray* data = cocos2d::CCByteArray::createWithData(sd);
cocos2d::CCNotificationCenter::sharedNotificationCenter()->postNotification("onRealTimeMessageReceived", data);
if(isCopy)
{
env->ReleaseByteArrayElements(receivedMess,pCData,JNI_ABORT);
}
}
I'm not understand here. If I don't send byte array to another players yet send that array back to C++ by calling nativeOnRealTimeMessageReceived() method from Java side, it runs fine and logs correctly. It's mean that with the same byte[] package converted from char* in C++, if I just pass it back to C++, it's correct, but if I send it through Google Play Game Services, it goes wrong. What does this mean?