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Date: Fri, 3 Sep 2010 16:12:41 -0400 (EDT)
From: "Timothy Bish (JIRA)" <jira@apache.org>
To: dev@activemq.apache.org
Subject: [jira] Commented: (AMQCPP-306) CMS 3.2.1 - Trouble reading empty
 strings from MapMessage fields
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    [ https://issues.apache.org/activemq/browse/AMQCPP-306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=61672#action_61672 ] 

Timothy Bish commented on AMQCPP-306:
-------------------------------------


1. Not really sure what you mean in that first sentence.  If you are still seeing issues then have a look at the MapMessageTest case in test-integration and tell me what case I'm not testing for that I should add in order to see the error you are seeing.  

2. No, I only use Windows when I have to, so no DLL hell here.

3. See ConnectionMetaData class in CMS. 


> CMS 3.2.1 - Trouble reading empty strings from MapMessage fields
> ----------------------------------------------------------------
>
>                 Key: AMQCPP-306
>                 URL: https://issues.apache.org/activemq/browse/AMQCPP-306
>             Project: ActiveMQ C++ Client
>          Issue Type: Bug
>          Components: Example Code
>    Affects Versions: 3.2.1
>         Environment: - CMS 3.2.1 on Windows XP
> - ActiveMQ 5.3.0 and Java 1.6.0 on Red Hat Enterprise Linux Server release 5.3 (Tikanga)
> - Sending messages to a queue, using persistent messaging (via KahaDB) 
>            Reporter: Evan Kuhn
>            Assignee: Timothy Bish
>             Fix For: 3.2.2
>
>         Attachments: send_empty_string.cpp
>
>
> Hi,
> I just upgraded from ActiveMQ CMS 3.1.3 to 3.2.1, and I'm having some trouble reading
> empty strings out of MapMessage fields after sending them through the broker. When I
> try to do so, MapMessage::getString() throws the exception "Unsupported Type Conversion".
> To explain, here's what I do:
> - Open a connection with my ActiveMQ broker
> - Create a MapMessage. Set two string fields, one empty, one non-empty:
>   - request->setString("STR_FIELD_1", "");
>   - request->setString("STR_FIELD_2", "asdf");
> - Send the message to a queue
> - Read the message from the queue
> - Read the two string fields from the response:
>   - response->getString("STR_FIELD_1", "");
>   - response->getString("STR_FIELD_2", "asdf");
>  
> Reading the non-empty string field works fine. Reading the empty one, however,
> results in the exception "Unsupported Type Conversion".
> Any idea why this is happening? I did not experience this with CMS 3.1.3.
> For reference, I'm using:
> - CMS 3.2.1 on Windows XP
> - ActiveMQ 5.3.0 and Java 1.6.0 on Red Hat Enterprise Linux Server release 5.3 (Tikanga)
> - Sending messages to a queue, using persistent messaging (via KahaDB)
> I'll post a small C++ program I'm using to reproduce the problem.
> Thank you very much for your help
> -- Evan Kuhn 

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