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https://issues.apache.org/jira/browse/TUSCANY-1130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12475066
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Frank Budinsky commented on TUSCANY-1130:
-----------------------------------------
Hasan, why don't you start by figuring out exactly what shared model(s) the
threads are competing for. One way to fix it is to make sure that one thread
initializes the extendedmetadata before the others start. Maybe a finer-grain
approach is possible (e.g., override SDOExtendedMetaData.getType to syncronize
calls to it), but first we really need to understand where the problem is. What
are the other threads doing, if not also creating the helper context?
Thanks,
Frank.
> 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
>
>
> 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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