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https://issues.apache.org/jira/browse/DERBY-1275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465898
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Mamta A. Satoor commented on DERBY-1275:
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Dan(on Derby developer list) pointed me to following link  about passing system 
properties to a junit test
http://wiki.apache.org/db-derby/KillDerbyTestHarness#head-7c93c8d40525f1a79304ac980a098edf08bf4105
First FAQ in the list.


> 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, 
> DERBY1275EnableClientTracingStatV1.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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