[jira] Resolved: (TUSCANY-1006) ChangeSummaryImpl.cachedSDOObjectChanges appears to not be thread safe

["Frank Budinsky (JIRA)" <tu...@ws.apache.org>]

     [ https://issues.apache.org/jira/browse/TUSCANY-1006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Frank Budinsky resolved TUSCANY-1006.
-------------------------------------

    Resolution: Fixed

I'm assuming this is fixed in EMF 2.2.2. Please reopen if not.

> ChangeSummaryImpl.cachedSDOObjectChanges appears to not be thread safe
> ----------------------------------------------------------------------
>
>                 Key: TUSCANY-1006
>                 URL: https://issues.apache.org/jira/browse/TUSCANY-1006
>             Project: Tuscany
>          Issue Type: Bug
>          Components: Java SDO Implementation
>    Affects Versions: Java-SDO-M3
>         Environment: Sun JDK 1.4.2_11, 2-CPU server
>            Reporter: Ron Gavlin
>            Priority: Critical
>             Fix For: Java-SDO-Mx
>
>
> I have an application in which multiple threads access a shared ChangeSummaryImpl. Each thread invokes ChangeSummaryImpl.getOldValues() repeatedly. This causes one or more of the threads to enter an infinite "while (true) -" loop in HashMap.get(Object) with the following stack trace:
> HashMap.get(Object) line: 323
> ChangeSummaryImpl.getOldValues(DataObject) line: 481
> ...
> I suspect this occurs because the access to HashMap cachedSDOObjectChanges is not synchronized. 
> I have been unable as of yet to create a simple test case that demonstrates the problem. In the meantime, I will try to implement a short-term fix by changing line 93 of ChangeSummaryImpl 
> from
> protected HashMap cachedSDOObjectChanges = new HashMap();
> to
> protected Map cachedSDOObjectChanges = Collections.synchronizedMap(new HashMap());
> I will let you know if that fixes the problem. Any insight or assistance you can offer concerning this problem is appreciated. This is a show-stopper problem for us.
> Regards,
> - Ron

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