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http://issues.apache.org/jira/browse/TUSCANY-1006?page=comments#action_12460015
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Frank Budinsky commented on TUSCANY-1006:
-----------------------------------------
I don't know a lot about thread safety/sychronizing but I wonder if changing
the put() call to something like this might be a less brute force solution to
the problem:
synchronized(cachedSDOObjectChanges) {
cachedSDOObjectChanges.put(dataObject, sdoSettings); }
Does that fix your scenario?
> ChangeSummaryImpl.cachedSDOObjectChanges appears to not be thread safe
> ----------------------------------------------------------------------
>
> Key: TUSCANY-1006
> URL: http://issues.apache.org/jira/browse/TUSCANY-1006
> Project: Tuscany
> Issue Type: Bug
> Components: Java SDO Implementation
> Affects Versions: Java-M2
> Environment: Sun JDK 1.4.2_11, 2-CPU server
> Reporter: Ron Gavlin
> Priority: Critical
>
> 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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