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From "Chris Dolan (Created) (JIRA)" <>
Subject [jira] [Created] (AMQ-3776) synchronization error in MessageListenerServlet.getAjaxWebClient
Date Mon, 19 Mar 2012 20:51:38 GMT
synchronization error in MessageListenerServlet.getAjaxWebClient

                 Key: AMQ-3776
             Project: ActiveMQ
          Issue Type: Bug
    Affects Versions: 5.5.0
            Reporter: Chris Dolan
            Priority: Minor

Note: I found this problem by reading code, not by an actual behavior problem!

In the latest revision of MessageListenerServlet.getAjaxWebClient() you can see that the ajaxWebClients
map is read outside of a synchronized block and then edited inside the block. This looks like
a simple mistake, and the get() should be moved down one line.

Theoretically, the downside of this bug will be that new clients will be unnecessarily created
if a single web session connects to the servlet from two or more concurrent connections. In
practice, this almost never happens because most ajax users of ActiveMQ should have only one
connection in flight at a time.

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