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https://issues.apache.org/jira/browse/DERBY-1275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mamta A. Satoor updated DERBY-1275:
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    Attachment: DERBY1275EnableClientTracingStatV4.txt
                DERBY1275EnableClientTracingDiffV4.txt

Dan, I have 
1)taken care of "." from the trace directory for portability reasons, 
2)removed the use of static field from the junit test and 
3)created a new method to fetch the system property rather than duplicating the 
code in 2 places in ClientBaseDataSource. 

All these changes are in DERBY1275EnableClientTracingDiffV4.txt. svn stat -q 
output hasn't really changed since the last attachement but I have copied it 
again ( DERBY1275EnableClientTracingStatV4.txt) to have svn stat -q output for 
every patch revision.

As for your last comment about decorators, I am not 100% clear yet on what you 
are proposing. I will spend some more time in trying to figure it out.

I will fire the junit test suite to make sure the patch attached doesn't cause 
any regression.

> Provide a way to enable client tracing without changing the application
> -----------------------------------------------------------------------
>
>                 Key: DERBY-1275
>                 URL: https://issues.apache.org/jira/browse/DERBY-1275
>             Project: Derby
>          Issue Type: Improvement
>          Components: Network Client
>    Affects Versions: 10.1.3.1, 10.2.1.6
>            Reporter: Kathey Marsden
>         Assigned To: Mamta A. Satoor
>            Priority: Minor
>             Fix For: 10.2.3.0
>
>         Attachments: DERBY1275EnableClientTracingDiffV1.txt, 
> DERBY1275EnableClientTracingDiffV2.txt, 
> DERBY1275EnableClientTracingDiffV3.txt, 
> DERBY1275EnableClientTracingDiffV4.txt, 
> DERBY1275EnableClientTracingStatV1.txt, 
> DERBY1275EnableClientTracingStatV2.txt, 
> DERBY1275EnableClientTracingStatV3.txt, DERBY1275EnableClientTracingStatV4.txt
>
>
> Currently  the client tracing can be enabled by  setting attributes on the 
> client url, setXXX methods on the DataSource or calling 
> DriverManager.setLogWriter(), but it often cannot be enabled in a deployed 
> client application  because all of these API's require modification of the 
> application or its configuration files.
> It would be good to have a global way to turn on client tracing.  A system 
> property pointing to a property file is  one possibility but probably not 
> ideal because of the impact in class loader contexts.    I am not sure what 
> the other possiblities are,

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