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http://issues.apache.org/jira/browse/TUSCANY-707?page=comments#action_12434586
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Ron Gavlin commented on TUSCANY-707:
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In my test, I first initialize all metadata and then create a list of 2000
dataobjects. The dataobject of choice has several Attribute properties followed
by one Reference property. The Reference property is the one causing problems.
After I create the dataobject list, I spawn 4 threads each of which starts at a
different index in the dataobject list and repeatedly invokes
DataObject.get("path") where path = "referencePropertyName/childPropertyName"
on different dataobjects in the list.
The test succeeds on a single-processor machine but fails on a multi-processor
machine. I don't think it is coincidental that this problem only shows up on a
multiprocessor box (See article
http://www.javaworld.com/jw-02-2001/jw-0209-toolbox.html).
I suspect there are synchronization problems with the map named
ClassImpl.propertyNameToPropertyMap. Based on the info in the article above, is
it possible that the null-checking trick currently being used to protect the
Map isn't sufficient on an MP box? Just for grins, I thought I would try
synchronizing on a lock associated with the propertyNameToPropertyMap and see
if the problem disappears. Any thoughts?
> IllegalArgumentException at
> o.a.t.sdo.util.DataObjectUtil.getOpenFeature(DataObjectUtil.java:1782)
> w/dual-core CPU
> ------------------------------------------------------------------------------------------------------------------
>
> Key: TUSCANY-707
> URL: http://issues.apache.org/jira/browse/TUSCANY-707
> Project: Tuscany
> Issue Type: Bug
> Components: Java SDO Implementation
> Affects Versions: Java-M1
> Environment: WinXP Professional w/dual-core CPU
> Reporter: Ron Gavlin
> Priority: Critical
>
> I have a load test which concurrently interrogates properties from different
> "myDataObject" instances in different threads. When the test is run on a
> dual-core PC, several threads throw the following IllegalArgumentException
> while other threads execute without problem. When I run the test on a
> single-processor PC, no exception is thrown. Any suggestions?
> Thanks in advance for your assistance.
> - Ron
> java.lang.IllegalArgumentException: Class 'MyDataObject' does not have a
> feature named 'myChildDataObject'
> at
> org.apache.tuscany.sdo.util.DataObjectUtil.getOpenFeature(DataObjectUtil.java:1782)
> at
> org.apache.tuscany.sdo.util.DataObjectUtil.getProperty(DataObjectUtil.java:2345)
> at
> org.apache.tuscany.sdo.impl.DataObjectImpl.getProperty(DataObjectImpl.java:1284)
> at
> org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.setFeatureName(DataObjectUtil.java:2032)
> at
> org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.process(DataObjectUtil.java:2139)
> at
> org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.init(DataObjectUtil.java:1918)
> at
> org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.create(DataObjectUtil.java:1838)
> at org.apache.tuscany.sdo.util.DataObjectUtil.get(DataObjectUtil.java:739)
> at org.apache.tuscany.sdo.impl.DataObjectImpl.get(DataObjectImpl.java:213)
> ...
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