PooledObject.getActiveTimeMillis() does not synch. access to lastReturnTime and 
lastBorrowTime
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                 Key: POOL-196
                 URL: https://issues.apache.org/jira/browse/POOL-196
             Project: Commons Pool
          Issue Type: Bug
            Reporter: Sebb


The method PooledObject.getActiveTimeMillis() compares lastReturnTime and 
lastBorrowTime, but is not synchronised; nor are the variables volatile.

There are two possible thread issues here: safe publication of the variables, 
and possible window error when comparing the values.

The method needs to be synch. and the fields need to be volatile (or the 
getters need to be synch.)

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