Are you running latest version? Did you check jira? 

There was bunch of similar issues fixed in the diff module recently. 
http://jira.magnolia-cms.com/issues/?jql=project%20%3D%20MGNLDIFF%20AND%20text%20~%20npe

HTH,
Jan

On Apr 3, 2013, at 8:53 AM, sowji AG (via Magnolia Forums) 
<[email protected]> wrote:

> When try to compare two different versions of page using versionDiff am 
> getting the following exception.Can any one  help me in this.
> 
> type Exception report
> message
> description The server encountered an internal error () that prevented it 
> from fulfilling this request.
> exception
> 
> java.lang.RuntimeException: java.lang.NullPointerException
>        
> info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:165)
>     
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>       
> info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:76)
>      
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>      
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>    
> info.magnolia.cms.filters.RangeSupportFilter.doFilter(RangeSupportFilter.java:86)
>    
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>  
> info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:60)
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>       
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>     
> info.magnolia.cms.security.SecurityCallbackFilter.doFilter(SecurityCallbackFilter.java:86)
>    
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>        
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>      info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:93)
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>     
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>   
> info.magnolia.module.templatingkit.filters.SiteMergeFilter.doFilter(SiteMergeFilter.java:99)
>        
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>        
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>      
> info.magnolia.module.extendedtemplatingkit.filters.MultiSiteFilter.doFilter(MultiSiteFilter.java:100)
>  
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>  info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>        
> info.magnolia.cms.filters.MultiChannelFilter.doFilter(MultiChannelFilter.java:83)
>        
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>  info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:75)
>  
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>      
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>  
> info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:93)
>    
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>  
> info.magnolia.enterprise.registration.RegistrationFilter.doFilter(RegistrationFilter.java:52)
>      
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>      
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>  
> info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:87)
>    
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>        
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>      
> info.magnolia.module.devicedetection.filter.DeviceDetectionFilter.doFilter(DeviceDetectionFilter.java:73)
>      
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>  info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>        
> info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:102)
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>       info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:131)
>        
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>        
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>      
> info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:67)
>    
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>    
> info.magnolia.cms.filters.SafeDestroyMgnlFilterWrapper.doFilter(SafeDestroyMgnlFilterWrapper.java:108)
>       
> info.magnolia.cms.filters.MgnlFilterDispatcher.doDispatch(MgnlFilterDispatcher.java:67)
> info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:108)
>        
> info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:94)
> 
> root cause
> 
> java.lang.NullPointerException
>  
> info.magnolia.module.diff.VersionDiffHtmlServlet.getVersionSource(VersionDiffHtmlServlet.java:182)
> info.magnolia.module.diff.VersionDiffHtmlServlet.getVersionDiffHtml(VersionDiffHtmlServlet.java:170)
>      
> info.magnolia.module.diff.VersionDiffHtmlServlet.doGet(VersionDiffHtmlServlet.java:98)
> javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
>      javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
>   
> info.magnolia.cms.filters.ServletDispatchingFilter.doFilter(ServletDispatchingFilter.java:123)
>      
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>      
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>  info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>        
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>      
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>  info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>        
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>      
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>  info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:67)
>        
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>        
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>      
> info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:70)
>  
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>  info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>        
> info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:58)
>   
> info.magnolia.module.cache.executor.CompositeExecutor.processCacheRequest(CompositeExecutor.java:66)
>        
> info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:153)
>     
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>       
> info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:76)
>      
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>      
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>    
> info.magnolia.cms.filters.RangeSupportFilter.doFilter(RangeSupportFilter.java:86)
>    
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>  
> info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:60)
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>       
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>     
> info.magnolia.cms.security.SecurityCallbackFilter.doFilter(SecurityCallbackFilter.java:86)
>    
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>        
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>      info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:93)
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>     
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>   
> info.magnolia.module.templatingkit.filters.SiteMergeFilter.doFilter(SiteMergeFilter.java:99)
>        
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>        
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>      
> info.magnolia.module.extendedtemplatingkit.filters.MultiSiteFilter.doFilter(MultiSiteFilter.java:100)
>  
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>  info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>        
> info.magnolia.cms.filters.MultiChannelFilter.doFilter(MultiChannelFilter.java:83)
>        
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>  info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:75)
>  
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>      
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>  
> info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:93)
>    
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>  
> info.magnolia.enterprise.registration.RegistrationFilter.doFilter(RegistrationFilter.java:52)
>      
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>      
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>    info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
>  
> info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:87)
>    
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>        
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>      
> info.magnolia.module.devicedetection.filter.DeviceDetectionFilter.doFilter(DeviceDetectionFilter.java:73)
>      
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
>  info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>        
> info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:102)
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>       info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:131)
>        
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>        
> info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
>      
> info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:67)
>    
> info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
>    
> info.magnolia.cms.filters.SafeDestroyMgnlFilterWrapper.doFilter(SafeDestroyMgnlFilterWrapper.java:108)
>       
> info.magnolia.cms.filters.MgnlFilterDispatcher.doDispatch(MgnlFilterDispatcher.java:67)
> info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:108)
>        
> info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:94)
> 
> -- 
> Context is everything: 
> http://forum.magnolia-cms.com/forum/thread.html?threadId=f2be8ced-9a10-465a-baab-e431e07f28c7
> 
> 
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