@Override
    public String toString() {
        return getClass().getSimpleName() + "[#" + msgId + ", result=" + result
                                          + (error != null ? ", error=" + error : "")
                                          + (exception != null ? ", exception=" + exception : "")
                                          + "]";
    }
Used internally to send an RPC call's response back to
 the caller.

 @author    Paul Speed
jme3-networking/src/main/java/com/jme3/network/service/rpc/msg/RpcResponseMessage.java