JNI, cast between jobect and jthrowable

I need raise an exception from C++ code. Raised exception must contain text and code of error. So common form:

ThrowNew(jclass clazz, const char *msg)

is not applicable. That is why I want create my own instance of java class:

public class MyException extends Exception

that contains one more property for code. But JNI interface has only declaration for

Throw(jthrowable obj)

Is it correct to cast instance of MyException to jthrowable ?

For the JVM jthrowable is an instance of java.lang.Throwable so if you instantiate the exception in your JNI code and cast it, it should work.