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From "Timothy Bish (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQCPP-306) CMS 3.2.1 - Trouble reading empty strings from MapMessage fields
Date Mon, 26 Jul 2010 22:41:53 GMT

    [ https://issues.apache.org/activemq/browse/AMQCPP-306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=60927#action_60927
] 

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

You might want to give the v3.2.2 release candidate code a try and see if that fixes your
problem, I can't seem to reproduce this on the 3.2.x or trunk code.

See the upcoming 3.2.2 release page here:
http://activemq.apache.org/cms/activemq-cpp-322-release.html

> 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
>         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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