[AMQCPP-306] CMS 3.2.1 - Trouble reading empty strings from MapMessage fields

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 3.2.1
• Fix Version/s: 3.2.2
• Component/s: Example Code

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)

• Assignee: Timothy A. Bish
• Reporter: Evan Kuhn
• Created: 26/Jul/10 17:44
• Updated: 03/Sep/10 20:12
• Resolved: 05/Aug/10 12:41

Description

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