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https://issues.apache.org/jira/browse/TUSCANY-1130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12475247
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Frank Budinsky commented on TUSCANY-1130:
-----------------------------------------
Hasan,
I have 2 concerns with this fix:
1) The performance - isn't synchronized hashmap slow?
2) We still don't know what the other colliding threads are doing, if not also
creating helper contexts? Looking at the code, the XSDExtendedMetaData
constructor is supposed to be initializing the map, so I wonder what's going on
that would result in another path into it.
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, 1130_final.patch, 1130_new.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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