ClassCastException while casting activemqObjectMessage

Question

why I can't cast ActiveMQObjectMessage in this code?

public void onMessage(Message message) {
    try {
        ActiveMQObjectMessage mqObjectMessage = (ActiveMQObjectMessage)  message; //i got exception here

        distributor.sendMessage(mqObjectMessage);

    } catch (ClassCastException e) {
        e.printStackTrace();
    }
}

Tim Bish · Accepted Answer · 2021-03-17T16:17:23.780

3

If the incoming type is of type TextMessage then of course you cannot cast it to an ObjectMessage as that is not the correct type as TextMessage does not implement the ObjectMessage interface. You need to use type checks to determine what type of message you are dealing with and perform the correct casts.

if (message instanceof ObjectMessage) {
} else if message instanceof TextMessage) {
} // etc

edited Mar 17 '21 at 16:17

answered Mar 17 '21 at 13:21

Tim Bish

17,475
4
32
42

my message was not the instance of the ActiveMQObjectMessage! – Issa Khodadadi Sep 21 '21 at 05:16

score 1 · Answer 2 · answered Sep 21 '21 at 05:34

1

There nothing wrong with your code, it is doing what it is meant for.

Assigning message with type casting to ActiveMQObjectMessage, if it has directly or indirectly implements ObjectMessage
If not caught the Exception and do proper logging so that you can inspect the source of message for correction.

answered Sep 21 '21 at 05:34

Amit Kumar Sharma

46
4

yes you are right, thanks, as I mentioned in the previous post comment, my ptroblem was that my `message` type was not the instance of `ActiveMQObjectMessage`. – Issa Khodadadi Sep 21 '21 at 05:56

ClassCastException while casting activemqObjectMessage

2 Answers2