[jira] [Updated] (JSPWIKI-742) ERROR [com.ecyrd.jspwiki.tags.WikiTagBase] Tag failed: java.lang.NullPointerException

["Rakesh K. Cherukuri (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JSPWIKI-742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rakesh K. Cherukuri updated JSPWIKI-742:
----------------------------------------

    Attachment: TestArrayListNPE.java

Class that confirms the concurrency issue in PriorityList class
                
> 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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Re: [jira] [Updated] (JSPWIKI-742) ERROR [com.ecyrd.jspwiki.tags.WikiTagBase] Tag failed: java.lang.NullPointerException

[Ichiro Furusato <ic...@gmail.com>]

Hi, perhaps change the backing ArrayList to a
java.util.concurrent.CopyOnWriteArrayList?
As its class documentation states, the overhead is only during
mutations, not during
traversals, so this might be a suitable solution.