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From "Simon Laws (Updated) (JIRA)" <...@tuscany.apache.org>
Subject [jira] [Updated] (TUSCANY-3770) Tomcat 7 reports a memory leak when stopping a Tuscany webapp
Date Thu, 01 Mar 2012 16:19:57 GMT

     [ https://issues.apache.org/jira/browse/TUSCANY-3770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Simon Laws updated TUSCANY-3770:
--------------------------------

    Attachment: ThreadMessageContext.java.patch

A patch for the 2.x code base. Want to do this fix separately so I can be sure I'm not messing
anything up. 
                
> Tomcat 7 reports a memory leak when stopping a Tuscany webapp
> -------------------------------------------------------------
>
>                 Key: TUSCANY-3770
>                 URL: https://issues.apache.org/jira/browse/TUSCANY-3770
>             Project: Tuscany
>          Issue Type: Bug
>          Components: Java SCA Web App Integration
>    Affects Versions: Java-SCA-1.6
>            Reporter: Simon Nash
>            Assignee: Simon Nash
>             Fix For: Java-SCA-1.6.1
>
>         Attachments: ThreadMessageContext.java.patch
>
>
> On Tomcat 7, when a Tuscany webapp is stopped, the following message is displayed:
>   SEVERE: The web application [/sample-calculator-webapp] created a ThreadLocal with
key of type [null] (value
>   [org.apache.tuscany.sca.core.invocation.ThreadMessageContext$1@1b071c0]) and a value
of type
>   [org.apache.tuscany.sca.core.invocation.MessageImpl] (value [org.apache.tuscany.sca.core.invocation.MessageImpl@fbf51d])
>   but failed to remove it when the web application was stopped. This is very likely to
create a memory leak.
> This happens because Tuscany adds a thread-local ThreadMessageContext object to every
invocation thread when starting a request invocation and doesn't remove this object when the
request is complete.
> There is code in WebAppServletHost.destroy() that attempts to remove this context information
when the webapp is stopped.  This usually doesn't succeed in removing the context information
because the ThreadLocal.remove() method only removes context information from the current
thread and not from other threads.  There's no Java API for removing this information from
other threads.
> The only way to remove this information is to track the completion of each request invocation
and remove the context information from the current thread when the request has been completed.
 The context information will be recreated for the next request on the thread.  This is very
easy to implement by adding a few lines of code to the ThreadMessageContext class.

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