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https://issues.apache.org/jira/browse/JSPWIKI-644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853052#action_12853052
 ] 

Fabian Haupt commented on JSPWIKI-644:
--------------------------------------

I've added a simple check to suppress the calling so it works for us, but I'm 
not familiar enough with the JSPWiki core to assess any implication that might 
have...
### Eclipse Workspace Patch 1.0

#P JSPWiki-2.8
Index: src/com/ecyrd/jspwiki/WikiEngine.java
===================================================================
--- src/com/ecyrd/jspwiki/WikiEngine.java       (revision 930452)
+++ src/com/ecyrd/jspwiki/WikiEngine.java       (working copy)
@@ -1637,7 +1637,7 @@
             StopWatch sw = new StopWatch();
             sw.start();
 
-            if( runFilters )
+            if( runFilters && (m_filterManager != null) )
                 pagedata = m_filterManager.doPreTranslateFiltering( context, 
pagedata );
 
             MarkupParser mp = m_renderingManager.getParser( context, pagedata 
);


> When a page was modified externally and is read by a plugin via 
> WikiEngine.getPage(..) during intialization a NPE is thrown
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: JSPWIKI-644
>                 URL: https://issues.apache.org/jira/browse/JSPWIKI-644
>             Project: JSPWiki
>          Issue Type: Bug
>          Components: Core & storage, Plugins
>    Affects Versions: 2.8.3
>         Environment: This happens on all kinds of plattforms (tested on MacOS 
> 10/Gentoo/Debian/Windows)
>            Reporter: Fabian Haupt
>            Priority: Minor
>
> Our plugin extends  BasicPageFilter and implements  WikiPlugin and 
> WikiEventListener. During the initialisation of the wikisystem we are getting 
> the source of a specific page. (some settings are stored there). 
> This works quite well most of the time. But when this page was externally 
> modified (by editor...) the call to getPage(..) results in a null result. 
> I've traced it down to the location of it happening: in the class WikiEngine, 
> the methoed
> private String textToHTML( WikiContext context, String pagedata, 
> StringTransmutator localLinkHook,
>                                StringTransmutator extLinkHook, 
> StringTransmutator attLinkHook, boolean parseAccessRules,
>                                boolean justParse )
> calls 
> pagedata = m_filterManager.doPreTranslateFiltering( context, pagedata ); 
> in line 1615
> at this point the m_filterManager isn't initialized yet, therefore resulting 
> in an NPE.

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