Driver trace file isn't closed/released on physical connection close when 
specified with the traceFile attribute/setter
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                 Key: DERBY-4717
                 URL: https://issues.apache.org/jira/browse/DERBY-4717
             Project: Derby
          Issue Type: Bug
          Components: Network Client
    Affects Versions: 10.7.0.0
            Reporter: Kristian Waagan
            Assignee: Kristian Waagan
            Priority: Minor


When specifying a trace file with the traceFile connection URL attribute or 
with the data source setter method, the handle to the trace file isn't released 
when the physical connection is closed.
The problem may be specific to the implementations of ConnectionPoolDataSource 
and XADataSource, as using a plain data source doesn't involve reuse (i.e 
another mechanism may close the trace file handle).

Two potential problems caused by this bug:
 o resource leak  (i.e., too many file handles open)
 o trace files cannot be deleted on Windows (seen for DERBY-4709)

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