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https://issues.apache.org/jira/browse/JXPATH-152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13257293#comment-13257293
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Naozumi Taromaru commented on JXPATH-152:
-----------------------------------------

> correction method 3: (JDK1.3 compatible. but contrary to usage.)
Sorry, it has problem.
ArrayIndexOutOfBoundsException may occur.

The problem did not occur in the case of Sun(Oracle) JDK5.
result of get method:
 * return null
 * return value object

But, the problem occured in the case of Sun(Oracle) JDK6.
result of get method:
 * return null
 * return value object
 * throw ArrayIndexOutOfBoundsException

                
> Concurrent access on hashmap of JXPathIntrospector
> --------------------------------------------------
>
>                 Key: JXPATH-152
>                 URL: https://issues.apache.org/jira/browse/JXPATH-152
>             Project: Commons JXPath
>          Issue Type: Bug
>    Affects Versions: 1.3
>         Environment: Java5, Windows/AIX
>            Reporter: pleutre
>            Assignee: Matt Benson
>            Priority: Minor
>             Fix For: 1.4
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> JXPathIntrospector.registerDynamicClass method can be called in static part 
> of classes. 
> If two classes A & B try to registerDynamicClass in the same time a 
> concurrent access exception can append on hashmap of JXPathIntrospector.
> Replace hashmap by concurrent hashmap or synchronized access to these 
> hashmaps.

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