Thread safety issues in AbandonedTrace class
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                 Key: DBCP-271
                 URL: https://issues.apache.org/jira/browse/DBCP-271
             Project: Commons Dbcp
          Issue Type: Bug
            Reporter: Sebb
             Fix For: 1.3


DBCP-270 implies that the AbandonedTrace class is called from multiple threads, 
however it is not thread-safe:

* SimpleDateFormat  is not threadsafe, but it is called without protection.
* various instance fields need to be made final to ensure that they are 
published correctly (memory visibility)
* getLastUsed/setLastUsed need to be synchronized

Also, the Javadoc for printStackTrace() is wrong.

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