How to convert QByteArray to jbyteArray and pass it to a function?

Question

Java

Greetings.
Java has a function, for example:

public int send(byte[] data) 
{
....
}

I need to call it from C++ and pass a QByteArray
stuck on something I can't convert:

QByteArray data;
    .... 
    jbyteArray buffer = data ; //???
    myActivity.callMethod<int>("send", "([BI)I", buffer);

Tell me, please, how is it right?

Answer 1

How about QByteArray::data()?
The signature "([BI)I" shows that an int is also passed to the method, although I don't see it above.