// equivalent C JNI reflection
Class theClass = Class.forName( "java.lang.Long" );

jclass theClass = (*env)->FindClass( env, "java/lang/Long" );

jclass classClass = (*env)->GetObjectClass( env, theClass );

jmethodID mid = (*env)->GetMethodID( env, classClass, "getConstructors",
                                     "()[Ljava/lang/reflect/Constructor;" );

jarray constructorList = (jarray)(*env)->CallObjectMethod( env, theClass, mid );