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From "Meir Shahar (JIRA)" <j...@apache.org>
Subject [jira] Created: (POOL-123) borrowObject from the GenericObjectPool hangs on a wait() method when the WHEN_EXHAUSTED_BLOCK is set
Date Sun, 03 Feb 2008 15:32:08 GMT
borrowObject from the GenericObjectPool hangs on a wait() method when the WHEN_EXHAUSTED_BLOCK
is set
-----------------------------------------------------------------------------------------------------

                 Key: POOL-123
                 URL: https://issues.apache.org/jira/browse/POOL-123
             Project: Commons Pool
          Issue Type: Bug
    Affects Versions: 1.4
         Environment: Windows XP, eclipse. JDK 1.6
            Reporter: Meir Shahar
            Priority: Minor


This bug is related to bugs #1, #38 & #102. Thought the bugs are closed, I think there
is a (edge condition) scenario that is not handled properly:

Config:
10 active connections limit
RemoveAbandoned set to 'on'
RemoveAbandonedTimeout set to x (say 60 secs)

Suppose 10 connections were borrowed and the 11 th request was issued, all within a time frame
shorted then the timeout.

The first 10 requests are in methods that do not properly release the connection.

This means that the 11 th thread is waiting indefinitely until a notify is sent.
The 'non releasing' threads the first 10 connections hence no notification is sent
The 'garbage collection' is performed by the calling AbandonedObjectPool before calling the
GenericObjectPool.borrowObject(...). This garbage collection will not be called again and
the wait() will stay locked though some connections might be come available through timeout
expiration.

The quick n dirty workaround is to setMaxWait(...) but still I think a better solution will
be along the lines of:
1. Waiting for removeAbandonedTimeout secs
2. Retry regular allocation



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