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MQSeries.net Forum Index » IBM MQ Java / JMS » ClassCast exception for QueueConnection.

ClassCast exception for QueueConnection.

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ganesh3

Posted: Mon Apr 17, 2006 9:04 pm Post subject: ClassCast exception for QueueConnection.

Apprentice

Joined: 30 Mar 2006
Posts: 35

Hi,
I have a method whose return type is javax.jms.Connection. But when I retrieve it by type casting it in an javax.jms.QueueConnection object in another method, it gives me an ClassCastException. Is it not possible to typecast them. Kindly let me know the same and also is it possible to use the javax.jms.Connection object to create a session?
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fjb_saper

Posted: Tue Apr 18, 2006 6:26 pm Post subject:

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY

Well if you look at the API javax.jms.QueueConnection extends javax.jms.Connection

So what ever you retrieved is not a QueueConnection. Have you thought to check it against javax.jms.TopicConnection ?

Enjoy

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mvic

Posted: Wed Apr 19, 2006 1:55 am Post subject: Re: ClassCast exception for QueueConnection.

Jedi

Joined: 09 Mar 2004
Posts: 2080

ganesh3 wrote:

But when I retrieve it by type casting it in an javax.jms.QueueConnection object in another method, it gives me an ClassCastException.

Is "javax.jms.Connection" derived from "javax.jms.QueueConnection"? I think it would have to be so, in order for the cast to work. (This is how it would work in C++ anyway, I think...)

I expect you are allowed to cast in the other direction ie. from the derived class to its parent.

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