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https://issues.apache.org/jira/browse/DIGESTER-163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230070#comment-13230070
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Simone Tripodi edited comment on DIGESTER-163 at 3/15/12 11:07 AM:
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I imported a simplified version of your testcase in the Digester codebase, see
[r1300873|https://svn.apache.org/viewvc?view=revision&revision=1300873];
unfortunately I am not able to reproduce the issue :(
IIUC - apologize if I am wrong - the problem could be in your wrappers that
allows concurrency in the loader creation - using the {{ConcurrentHashMap}} you
keep the data structure thread-safe but it doesn't shield from races and
concurrent accesses to the Loader creation...
Can you please check it? TIA!!!
was (Author: simone.tripodi):
I imported a simplified version of your testcase in the Digester codebase,
see [r1300873|https://svn.apache.org/viewvc?view=revision&revision=1300873];
unfortunately I am not able to reproduce the issue :(
IIUC - apologize if I am wrong - the problem could be in your wrappers that
allows concurrency in the loader creation - using the {{{ConcurrentHashMap}}
you keep the data structure thread-safe but it doesn't shield from races and
concurrent accesses to the Loader creation...
Can you please check it? TIA!!!
> ConcurrentModificationException creating a new Digester via
> loaderInstance.newDigester()
> ----------------------------------------------------------------------------------------
>
> Key: DIGESTER-163
> URL: https://issues.apache.org/jira/browse/DIGESTER-163
> Project: Commons Digester
> Issue Type: Bug
> Affects Versions: 3.2
> Environment: Linux, JDK 6
> Reporter: Torsten Krah
>
> I am gettig a ConcurrentModificationException when trying to create new
> Digester instance from a configured loader:
> Trace is:
> {code}
> java.util.ConcurrentModificationException: null
> at
> java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:761)
> ~[na:1.6.0_27]
> at java.util.LinkedList$ListItr.next(LinkedList.java:696) ~[na:1.6.0_27]
> at
> org.apache.commons.digester3.binder.FromBinderRuleSet.addRuleInstances(FromBinderRuleSet.java:130)
> ~[commons-digester3-3.2.jar:3.2]
> at
> org.apache.commons.digester3.binder.DigesterLoader.addRules(DigesterLoader.java:581)
> ~[commons-digester3-3.2.jar:3.2]
> at
> org.apache.commons.digester3.binder.DigesterLoader.newDigester(DigesterLoader.java:568)
> ~[commons-digester3-3.2.jar:3.2]
> at
> org.apache.commons.digester3.binder.DigesterLoader.newDigester(DigesterLoader.java:516)
> ~[commons-digester3-3.2.jar:3.2]
> at
> org.apache.commons.digester3.binder.DigesterLoader.newDigester(DigesterLoader.java:475)
> ~[commons-digester3-3.2.jar:3.2]
> at
> org.apache.commons.digester3.binder.DigesterLoader.newDigester(DigesterLoader.java:462)
> ~[commons-digester3-3.2.jar:3.2]
> {code}
> The binder documentation (employee servlet) and the mailing list did confirm
> to me, that the loader should be safe to be shared, so this should not happen.
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