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class cast exception

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Join Date: Dec 2004

Posts: 489

Reputation: Acidburn is an unknown quantity at this point

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Acidburn

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class cast exception

Dec 27th, 2007

hey guys
I'm trying to get hold of a StreamConnection

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     try {
             StreamConnection conn =  ( StreamConnection )  Connector.open ( url ) ; 
 
        } catch (Exception ex) {
            ex.printStackTrace();
        }
     try {
             StreamConnection conn =  ( StreamConnection )  Connector.open ( url ) ; 

        } catch (Exception ex) {
            ex.printStackTrace();
        }

however when i do this i get the following error

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java.lang.ClassCastException

According to my know of and google it should compile fine. I've used this in a J2EE project and it works correctly but not in a J2ME???

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Join Date: Feb 2006

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masijade

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Re: class cast exception

Dec 27th, 2007

J2ME (Micro/Mobile Edition) is a limited version of the J2SE (Standard Edition) and definately will not have anything that first available in the J2EE (Enterprise Edition).

See http://java.sun.com/javame/reference/apis.jsp#api and select the link for the appropriate version to see the API docs, and find out what is available.

Java Programmer and Sun Systems Administrator

----------------------------------------------

Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan

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Join Date: Dec 2004

Posts: 489

Reputation: Acidburn is an unknown quantity at this point

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Acidburn

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Re: class cast exception

Dec 27th, 2007

I googled and quote the following websit whilst its implemented on J2EE its also available for J2ME

http://developers.sun.com/mobility/m...icles/network/

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Join Date: Nov 2006

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bugmenot

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Re: class cast exception

Dec 27th, 2007

the exception tells you exactly what's wrong; you can't cast it, because it's not that type

what makes you think that it is a StreamConnection? and why do you need it to be?

--
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Join Date: Dec 2004

Posts: 489

Reputation: Acidburn is an unknown quantity at this point

Solved Threads: 5

Acidburn

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Posting Pro in Training

Re: class cast exception

Dec 27th, 2007

The stream connection is dervived from that class and therefore can be an instance of it. The connector class can be casted to any of its child / parents... hence the HTTPConnection instance etc... take a look at my pervious url link