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https://issues.apache.org/jira/browse/JSPWIKI-742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528853#comment-13528853
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Rakesh K. Cherukuri commented on JSPWIKI-742:
---------------------------------------------
JSPWiki : 2.8.3
As part of RCA, found out that PriorityList is using ArrayList internally to
maintain the filters. As there is no synchronization in place, there will be
concurrent scenario (while adding filters) where there can be a null at one of
the index in the ArrayList. This is resulting in NullPointerExceptions for any
wiki page view requests.
Attached is a stand alone class that confirms the behavior in PriorityList.
> ERROR [com.ecyrd.jspwiki.tags.WikiTagBase] Tag failed:
> java.lang.NullPointerException
> -------------------------------------------------------------------------------------
>
> Key: JSPWIKI-742
> URL: https://issues.apache.org/jira/browse/JSPWIKI-742
> Project: JSPWiki
> Issue Type: Bug
> Affects Versions: 2.8.3
> Environment: RHEL_6.1
> Reporter: RAJESHWARAN
> Attachments: TestArrayListNPE.java
>
>
> Hello,
> I had used jspwiki2.8.3, i got the following error and the pages were
> displayed with an empty content.
> After restarting the apache in the site ,the jspwiki pages got displayed with
> contents and no errors were thrown.I'm sure this error was thrown from
> jspwiki code. could anyone know about this error?
> ERROR [com.ecyrd.jspwiki.tags.WikiTagBase] Tag failed:
> java.lang.NullPointerException
> at com.ecyrd.jspwiki.util.PriorityList.get(PriorityList.java:96) [:]
> at java.util.AbstractList$Itr.next(AbstractList.java:345) [:1.6.0_26]
> at
> com.ecyrd.jspwiki.filters.FilterManager.doPreTranslateFiltering(FilterManager.java:324)
> [:]
> at com.ecyrd.jspwiki.WikiEngine.textToHTML(WikiEngine.java:1511) [:]
> at com.ecyrd.jspwiki.WikiEngine.getHTML(WikiEngine.java:1455) [:]
> at
> com.ecyrd.jspwiki.tags.InsertPageTag.doWikiStartTag(InsertPageTag.java:128)
> [:]
> at com.ecyrd.jspwiki.tags.WikiTagBase.doStartTag(WikiTagBase.java:89)
> [:]
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