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https://issues.apache.org/jira/browse/TUSCANY-1130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hasan Muhammad updated TUSCANY-1130:
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Attachment: 1130.patch
HelperContextMultiThreadedTestCase.java
Frank,
I agree that synching the HashMap would create performance problems. The
problem seems to be only because multiple threads are accessing
createHelperContext as you saw, since while defining the EMF types in the
registry for the ExtendedMetaData, it gets delegated to parent registry which
is global registry. But once these EMF types are defined (put for HashMap), the
rest is all (get) and hence there is no problem after that.
One fix would be to simply synch the SDOUtil.createHelperContext(). I made that
fix in this patch. It works with the multiThreded Test case i have submitted.
The test case depends on GroboUtils jar, which can be obtained from
http://groboutils.sourceforge.net/, if you are interested in including into
tuscany build. This is just a set of extension classes to JUnit which includes
an extension class to build multi threaded testcases easily.
Hasan
> Concurrent access to SDOUtil.createHelperContext() results in exception
> -----------------------------------------------------------------------
>
> Key: TUSCANY-1130
> URL: https://issues.apache.org/jira/browse/TUSCANY-1130
> Project: Tuscany
> Issue Type: Bug
> Components: Java SDO Implementation
> Affects Versions: Java-M2
> Environment: All
> Reporter: Hasan Muhammad
> Fix For: Java-M2
>
> Attachments: 1130.patch, 1130.patch, 1130_final.patch,
> 1130_new.patch, HelperContextMultiThreadedTestCase.java
>
>
> In tuscany runtime, when multiple apps are started simultaneously, we get an
> exception as below: This is a problem with acessing
> SDOUtil.createHelperContext(0 concurrently.
> Exception = java.util.ConcurrentModificationException
> Source = com.ibm.ws.soa.sca.admin.config.loader.SDOLoader.<INIT>
> probeid = 80
> Stack Dump = java.util.ConcurrentModificationException: concurrent access to
> HashMap attempted by Thread[server.startup : 2,5,main]
> at java.util.HashMap.onExit(HashMap.java:217)
> at java.util.HashMap.transfer(HashMap.java:514)
> at java.util.HashMap.resize(HashMap.java:500)
> at java.util.HashMap.addEntry(HashMap.java:800)
> at java.util.HashMap.put(HashMap.java:441)
> at
> com.ibm.sdo.internal.ecore.util.BasicExtendedMetaData$EPackageExtendedMetaDataImpl.getType(BasicExtendedMetaData.java:2064)
> at
> com.ibm.sdo.internal.ecore.util.BasicExtendedMetaData.getType(BasicExtendedMetaData.java:115)
> at
> com.ibm.sdo.internal.xsd.ecore.XSDEcoreBuilder.populateTypeToTypeObjectMap(XSDEcoreBuilder.java:108)
> at
> org.apache.tuscany.sdo.helper.SDOXSDEcoreBuilder.<init>(SDOXSDEcoreBuilder.java:61)
> at
> org.apache.tuscany.sdo.helper.XSDHelperImpl.<init>(XSDHelperImpl.java:79)
> at
> org.apache.tuscany.sdo.helper.XSDHelperImpl.<init>(XSDHelperImpl.java:94)
> at
> org.apache.tuscany.sdo.helper.HelperContextImpl.<init>(HelperContextImpl.java:48)
> at
> org.apache.tuscany.sdo.helper.HelperContextImpl.<init>(HelperContextImpl.java:52)
> at
> org.apache.tuscany.sdo.util.SDOUtil.createHelperContext(SDOUtil.java:299)
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