Hi,

I'm also encountering this problem randomly since XWiki 2.0 but so far
haven't been able to find the initial cause. See also
http://www.mail-archive.com/users@xwiki.org/msg09549.html. As Marius
suggests it might have something to do with the plugin initialization
because re-initializing the plugin under those circumstances helps in my
case:

...
xwiki.getXWiki().getPluginManager().getPlugin("lucene").init(xwiki.getXWikiC
ontext()) ... 

but this of course doesn't solve the problem behind.

-Pete


-----Alkuperäinen viesti-----
Lähettäjä: users-boun...@xwiki.org [mailto:users-boun...@xwiki.org] Puolesta
Gerritjan Koekkoek
Lähetetty: 17. tammikuuta 2010 21:26
Vastaanottaja: XWiki Users
Aihe: Re: [xwiki-users] Lucene defaultpage fails

See below for extended error-report
I also paste the code
Op 17 jan 2010, om 18:12 heeft Flavius Olaru het volgende geschreven:

On Sun, Jan 17, 2010 at 1:35 PM, Gerritjan Koekkoek
<gerritjankoekk...@gmail.com> wrote:
> Navigating to the Main.LuceneSearch page brings up the following error?
> 
> Failed to execute macro: velocity
> org.xwiki.rendering.macro.MacroExecutionException: Failed to evaluate
Velocity Macro for content [$xwiki.jsfx.use("uicomponents/search/search.js",
true)##
> $xwiki.ssfx.use("uicomponents/search/search.css", true)##
> The page has worked, but what can be wrong now.
> The page itself is not changed from the distribution?
> 
> Gerritjan
> _______________________________________________
> users mailing list
> users@xwiki.org
> http://lists.xwiki.org/mailman/listinfo/users
> 
Hi Gerritjan,

Can you paste in more information about the error?

-- 
Flavius Olaru
## Disable the document extra data: comments, attachments, history...
#set($docextras = [])
## ===================
## Lucene search
## ===================
## Inputs : $request.text
## Outputs : $list, $isScored
## ===================
## Uncomment this line to overload the maximum list of wiki where to search
(also the one listed in the wikis combobox)
## #set($allwikinamelist = ["xwiki", "wiki1", "wiki2"])
##
## Uncomment this line to overload the wikis where to search
## #set($wikinames = "xwiki,wiki,wiki")
##
## Uncomment this line to overload the languages to search
## #set($languages = "default,en,de")
#set ($rssmode = ("$!request.xpage" == 'plain'))
## ---------------
## Space filtering
## ---------------
#set($extraClause = '')
#set($selectedSpace = "$!request.space")
#if($selectedSpace != '' && !$blacklistedSpaces.contains($selectedSpace))
  #set($extraClause = " AND web:${selectedSpace}")
#end
## ----------------------------------------------------------------------
## Exclude Blacklisted spaces ($blacklistedSpaces is set in xwikivars.vm)
## Also exclude WebPreferences.
## ----------------------------------------------------------------------
#foreach ($blacklistedSpace in $blacklistedSpaces)
  #set ($extraClause = " AND NOT web:${blacklistedSpace}${extraClause}")
#end
#if(!$hasAdmin && !$isAdvancedUser)
  #set ($extraClause = " AND NOT name:WebPreferences${extraClause}")
#end
## ---------------
## Space macros
## ---------------
#macro(spaceoption $space $selectedSpace)
  <option value="${space}" #if($selectedSpace ==
$space)selected="selected"#end>$space</option>
#end
#macro(spaceselect $selectedSpace $spaces)
  <select name="space" title="$msg.get('xe.search.bar.spaces.title')">
    <option value="" #if($selectedSpace ==
'')selected="selected"#end>$msg.get('xe.search.bar.spaces.all')</option>
    #foreach($space in $xwiki.spaces)
      #if (!$blacklistedSpaces.contains($space))
        #spaceoption($space $selectedSpace)
      #end
    #end
  </select>
#end
## ---------------
## Wikis filtering
## ---------------
#set($wikinamelist = [])
#if(!$wikinames)
  #set($wikinametable = $request.getParameterValues("wikinames"))
  #if(!$wikinametable || $request.wikinames == "")
    #set($wikinametable = $allwikinamelist)
  #end
  #set($wikinames = "")
  #foreach($wikiname in $wikinametable)
    #set($ok = $wikinamelist.add($wikiname))
    #if($wikinames != "")
      #set($wikinames = $wikinames + ",")
    #end
    #set($wikinames = $wikinames + $wikiname)
  #end
#else
  #set($wikinametable = $wikinames.split(", "))
  #foreach($wikiname in $wikinametable)
    #set($ok = $wikinamelist.add($wikiname))
  #end
#end
##
#if($xwiki.isVirtualMode())
  #if(!$allwikinamelist)
    #set($currentwikiname = $context.database)
    #set($ok = $context.setDatabase($context.mainWikiName))
    #set($allwikilist = $xwiki.searchDocuments(", BaseObject as obj,
StringProperty as prop where doc.fullName=obj.name and
obj.className='XWiki.XWikiServerClass' and prop.id.id=obj.id and
prop.id.name='server'"))
    #set($ok = $context.setDatabase($currentwikiname))
    ##
    #set($allwikinamelist = [])
    #foreach($wiki in $allwikilist)
      #set($ok = $allwikinamelist.add($wiki.substring(17).toLowerCase()))
    #end
    #if(!$allwikinamelist.contains($context.mainWikiName))
      #set($ok = $allwikinamelist.add($context.mainWikiName))
    #end
  #end
  ## ---------------
  ## Wikis macros
  ## ---------------
  #macro(wikinamesoption $wikiname $wikinamelist)
    <option value="$wikiname"
#if($wikinamelist.contains($wikiname))selected="selected"#end>$wikiname</opt
ion>
  #end
  #macro(wikinamesselect $allwikinamelist $wikinamelist)
    <select name="wikinames">
      <option value="" selected="selected">All</option>
      #foreach($wikiname in $allwikinamelist)
        #wikinamesoption($wikiname $wikinamelist)
      #end
    </select>
  #end
#else
  #if($wikinames == "")
    #set($wikinames = $context.mainWikiName)
  #end
#end
## ---------------
## Query preparation
## ---------------
#set($text = "$!request.getParameter('text')")
#set($query = $text)
#set($utext = $util.encodeURI($query))
#set($defaultItemsPerPage = 30)
#set($itemsPerPage = $util.parseInt("$!{request.perPage}"))
#if($itemsPerPage <= 0)
  #set($itemsPerPage = $defaultItemsPerPage)
#end
## ---------------
## Query form
## ---------------
#if(!$rssmode)
{{html}}
<form action="" method="get" id="searchBar">
  <div class="centered">
    <input type="text" name="text" class="searchQuery #if($text == '')
defaultText#end" #if($text == '')
value="$msg.get('xe.search.bar.query.tip')" #else
value="$xwiki.getXMLEncoded(${text})" #end
title="$msg.get('xe.search.bar.query.title')"/>
    #spaceselect($selectedSpace $spaces)
    <input type="submit" class="searchButton"
value="$msg.get('xe.search.bar.submit')"
title="$msg.get('xe.search.bar.submit.title')"/>
    <div class="searchHelp">$msg.get('xe.search.bar.queryTip')</div>
  </div>
</form>
{{/html}}
#end
## ---------------
## Results processing
## ---------------
#if($query != '')
  #set($lucene = $xwiki.getPlugin("lucene"))
  #if($lucene)    
    ## ---------------
    ## Lucene search
    ## ---------------
    #set($searchresults = $lucene.getSearchResults("${query}${extraClause}",
$wikinames, $!languages, $xwiki))
    #if($searchresults.getHitcount() > 0)
      ## -----------------
      ## Pagination (top)
      ## -----------------
      #if(!$rssmode)
        #set($paginationParameters = {'url' : $doc.getURL('view',
"text=${query}&amp;space=${selectedSpace}"), 'totalItems' :
$searchresults.getHitcount(), 'defaultItemsPerPage' : $defaultItemsPerPage,
'position': 'top'})
        {{html}}
          #pagination($paginationParameters)
        {{/html}}
      #end
      ## -----------------
      ## Display results
      ## -----------------
      #set($firstIndex = "$!{paginationParameters.firstItem}")
      #if($firstIndex == '')
        #set($firstIndex = "$!request.getParameter('firstIndex')")
        #if($firstIndex == '')
          #set($firstIndex = '0')
        #end
      #end
      #set($firstIndex = $util.parseInt($firstIndex))
      #set($firstIndex = $firstIndex + 1)
      #set($results = $searchresults.getResults("$firstIndex",
"$itemsPerPage"))
      #if ($rssmode)
        #set ($list = $util.arrayList)
        #foreach ($item in $results)
          #if ($item.type != "attachment")
            #set ($ok = $list.add(0, "${item.web}.${item.name}"))
          #end
        #end
        #set ($feed = $xwiki.feed.getDocumentFeed($list,
$util.getHashMap()))
        #set ($feedURI = $doc.getExternalURL("view"))
        #set ($discard = $feed.setLink($feedURI))
        #set ($discard = $feed.setUri($feedURI))
        #set ($discard = $feed.setAuthor('XWiki'))
        #set ($discard = $feed.setTitle($msg.get('xe.search.rss', [$text])))
        #set ($discard = $feed.setDescription($msg.get('xe.search.rss',
[$text])))
        #set ($discard = $feed.setLanguage($context.language))
        #set ($discard =
$feed.setCopyright($xwiki.getXWikiPreference('copyright')))
        $xwiki.feed.getFeedOutput($feed, 'rss_2.0')
      #else
        #set ($list = $results)
        #set ($isScored = true)
        {{include document="XWiki.Results"/}}
      #end
      ## -----------------
      ## Pagination (bottom)
      ## -----------------
      #if(!$rssmode)
        #set($paginationParameters.position = 'bottom')
        {{html}}
          #pagination($paginationParameters)
        {{/html}}
        ## ---------------
        ## RSS link
        ## ---------------
        #if($selectedSpace == '')
          #set($rssURL = $xwiki.getURL($doc.fullName, 'view',
"xpage=rdf&amp;text=${utext}" ))
        #else
          #set($rssURL = $xwiki.getURL($doc.fullName, 'view',
"xpage=rdf&space=${selectedSpace}&text=${utext}"))
        #end
        {{html}}
          <a href="${rssURL}"><img
src="$xwiki.getSkinFile("icons/silk/feed.gif")" alt="RSS
icon"/>$msg.get("xe.search.rss", ["[$query]"])</a>
        {{/html}}
      #end
    #end
  #else

    {{error}}$msg.get('xe.search.plugin.notfound')){{/error}}
  #end
#end
#if (!$rssmode)
  ## ---------------
  ## Rebuild processing
  ## ---------------
  #set($lucene = $xwiki.getPlugin("lucene"))
  #if($lucene)
    #set($doRebuild = "$!{request.getParameter('rebuild')}")
    #if($doRebuild == "yes")
      #set($documentCount = $lucene.rebuildIndex())
      #if(${documentCount} >= 0)
        
        {{info}}$msg.get("xe.search.rebuild.started"){{/info}}
      #elseif(${documentCount} == -1)

        {{error}}$msg.get("xe.search.rebuild.rights"){{/error}}

      #elseif(${documentCount} == -2)

        {{error}}$msg.get("xe.search.rebuild.inprogress"){{/error}}
      #else

        {{error}}$msg.get("xe.search.rebuild.failed"){{/error}}
      #end
    #else## !doRebuild
      ## ---------------
      ## Queue & rebuild option
      ## ---------------
      #set ($queuesize = $xwiki.lucene.getQueueSize())
      #if ($queuesize > 2)
        #set($info1 = $msg.get('xe.search.rebuild.currently',
[${queuesize}]))
      #else
        #set($info1 = $msg.get('xe.search.index.uptodate'))
      #end
      #if($hasAdmin)
        #set($info2 = "
[[$msg.get('xe.search.index.rebuild')>>${doc.space}.${doc.name}?rebuild=yes]
].")
      #else
        #set($info2 = "")
    #end

    {{info}}${info1}${info2}{{/info}}
  #end## doRebuild
  #set($defaultSearch =
"[[$msg.get('xe.search.default.engine')>>WebSearch?text=$utext]]")

  {{warning}}$msg.get('xe.search.lucene.experimental',
[$defaultSearch]){{/warning}}

#else## !lucene exists
  #set($defaultSearch =
"[[$msg.get('xe.search.default.engine')>>WebSearch?text=$utext]]")

  {{warning}}$msg.get('xe.search.plugin.notenabled',
[$defaultSearch]){{/warning}}
  #end## lucene exists
#end## !$rssmode]


at
org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluate(VelocityM
acro.java:118)
        at
org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluate(VelocityM
acro.java:44)
        at
org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptM
acro.java:200)
        at
org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptM
acro.java:52)
        at
org.xwiki.rendering.internal.transformation.MacroTransformation.transformOnc
e(MacroTransformation.java:175)
        at
org.xwiki.rendering.internal.transformation.MacroTransformation.transform(Ma
croTransformation.java:120)
        at
org.xwiki.rendering.internal.transformation.DefaultTransformationManager.per
formTransformations(DefaultTransformationManager.java:72)
        at
com.xpn.xwiki.doc.XWikiDocument.performSyntaxConversion(XWikiDocument.java:5
696)
        at
com.xpn.xwiki.doc.XWikiDocument.performSyntaxConversion(XWikiDocument.java:5
671)
        at
com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:569)
        at
com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:583)
        at com.xpn.xwiki.api.Document.getRenderedContent(Document.java:475)
        at sun.reflect.GeneratedMethodAccessor257.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(
UberspectImpl.java:389)
        at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(Ub
erspectImpl.java:378)
        at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270
)
        at
org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.ja
va:252)
        at
org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java
:493)
        at
org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.ja
va:71)
        at
org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirecti
ve.java:142)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:33
6)
        at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement
.java:106)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:33
6)
        at
org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEn
gine.java:191)
        at
org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEn
gine.java:156)
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.ja
va:116)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1710)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1631)
        at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:657)
        at sun.reflect.GeneratedMethodAccessor109.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(
UberspectImpl.java:389)
        at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(Ub
erspectImpl.java:378)
        at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270
)
        at
org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.ja
va:252)
        at
org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.jav
a:332)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
        at
org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroPro
xy.java:212)
        at
org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:
247)
        at
org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.jav
a:175)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
        at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement
.java:87)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:33
6)
        at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement
.java:106)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:33
6)
        at
org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEn
gine.java:191)
        at
org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEn
gine.java:156)
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.ja
va:116)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1710)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1631)
        at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:123)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:224)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115)
        at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProces
sor.java:431)
        at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
        at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        at
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:290)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
        at
com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilt
er.java:152)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
        at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:117)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
        at
com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:68)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
        at
com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFi
lter.java:295)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
        at
com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFi
lter.java:112)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:233)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:191)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128
)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102
)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:109)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
        at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
        at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:769)
        at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:698)
        at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java
:891)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:690)
        at java.lang.Thread.run(Thread.java:619)
Caused by: org.xwiki.velocity.XWikiVelocityException: Failed to evaluate
content with id [velocity macro]
        at
org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEn
gine.java:200)
        at
org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEn
gine.java:156)
        at
org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluate(VelocityM
acro.java:110)
        ... 93 more
Caused by: org.apache.velocity.exception.MethodInvocationException:
Invocation of method 'getQueueSize' in  class
com.xpn.xwiki.plugin.lucene.LucenePluginApi threw exception
java.lang.NullPointerException at velocity macro[line 246, column 34]
        at
org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationException(
ASTMethod.java:337)
        at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:284
)
        at
org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.ja
va:252)
        at
org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java
:493)
        at
org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.ja
va:71)
        at
org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirecti
ve.java:142)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:33
6)
        at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement
.java:106)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
        at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement
.java:87)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
        at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement
.java:87)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:33
6)
        at
org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEn
gine.java:191)
        ... 95 more
Caused by: java.lang.NullPointerException
        at
com.xpn.xwiki.plugin.lucene.LucenePlugin.getQueueSize(LucenePlugin.java:661)
        at
com.xpn.xwiki.plugin.lucene.LucenePluginApi.getQueueSize(LucenePluginApi.jav
a:183)
        at sun.reflect.GeneratedMethodAccessor370.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(
UberspectImpl.java:389)
        at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(Ub
erspectImpl.java:378)
        at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270
)
        ... 108 more

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