Re: [xwiki-users] Error on Tomcat console possibly related to adding a second blog

8 Feb 2008

Sergiu,

Thanks a lot for your quick reply and help. 
May I ask one more question, related to errors displayed on the Tomcat
console?

Any idea why I am getting the following exception (http://www.airl
ine-tickets.dl.pl is not something I have entered anywhere ...)?

Thanks in advance.

Darina

20:12:08,241
[http://iiscs.wssu.edu/xwiki/bin/viewrev/Photos/URL=http://www.airl
ine-tickets.dl.pl] [http-80-Processor8] ERROR log.SimpleLog4JLogSystem
-
Method display threw exception for reference $doc in template  at
[12,7]
org.apache.velocity.exception.MethodInvocationException: Invocation of
method 'display' in  class com.xpn.xwiki.api.Document threw exception
java.lang.NullPoint
erException @ <unknown template>[12,13]
        at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.j
ava:286)
        at
org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTRefer
ence.java:203)
        at
org.apache.velocity.runtime.parser.node.ASTReference.render(ASTRefere
nce.java:294)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java
:74)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.
java:318)
        at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfSt
atement.java:107)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java
:74)
        at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfSt
atement.java:88)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.
java:318)
        at
org.apache.velocity.runtime.directive.VelocimacroProxy.render(Velocim
acroProxy.java:194)
        at
org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirect
ive.java:170)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java
:74)
        at
org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:448
)
        at
org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirect
ive.java:170)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java
:74)
        at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfSt
atement.java:88)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.
java:318)
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRend
erer.java:238)
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRend
erer.java:152)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1366)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1335)
        at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:607)
        at sun.reflect.GeneratedMethodAccessor162.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.in
voke(UberspectImpl.java:295)
        at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.j
ava:245)
        at
org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTRefer
ence.java:203)
        at
org.apache.velocity.runtime.parser.node.ASTReference.render(ASTRefere
nce.java:294)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.
java:318)
        at
org.apache.velocity.runtime.directive.VelocimacroProxy.render(Velocim
acroProxy.java:194)
        at
org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirect
ive.java:170)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.
java:318)
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRend
erer.java:238)
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRend
erer.java:152)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1366)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1335)
        at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:607)
        at sun.reflect.GeneratedMethodAccessor162.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.in
voke(UberspectImpl.java:295)
        at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.j
ava:245)
        at
org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTRefer
ence.java:203)
        at
org.apache.velocity.runtime.parser.node.ASTReference.render(ASTRefere
nce.java:294)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.
java:318)
        at
org.apache.velocity.runtime.directive.VelocimacroProxy.render(Velocim
acroProxy.java:194)
        at
org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirect
ive.java:170)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.
java:318)
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRend
erer.java:238)
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRend
erer.java:152)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1366)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1335)
        at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:105)
        at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:48)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:186)
        at
org.apache.struts.action.RequestProcessor.processActionPerform(Reques
tProcessor.java:431)
        at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.ja
va:236)
        at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:119
6)
        at
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
        at
com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEnc
odingFilter.java:117)

-----Original Message-----
From: users-bounces(a)xwiki.org [mailto:users-bounces@xwiki.org] On Behalf
Of Sergiu Dumitriu
Sent: Thursday, February 07, 2008 8:27 PM
To: XWiki Users
Subject: Re: [xwiki-users] Error on Tomcat console possibly related to
adding a second blog

Dicheva, Darina wrote:
...
  Hello,

 I have installed xwiki 1.2 (MySql, Tomcat 5), and created a second blog
...
  following a suggestion in a previous postage to this
list (by adding the
...
  $space variable to the blog macro). Everything seems
to work just fine,
...
  but nevertheless I get error messages displayed on the
Tomcat console,
 such as:

 16:40:41,008 [http://iiscs.wssu.edu/xwiki/bin/view/Blog/]
 [http-80-Processor4] ERROR log.SimpleLog4JLogSystem        - Left side
 ($bentrydoc.fullName) of '==' operation has null value. If a reference,
...
  it may not be in the context. Operation not possible.
Blog.WebHome [line
...
  20, column 28] 

 It seems that the error is in the Blog.Macros' line below (I edited the
...
  original line to include $space):

 #if(($bentrydoc.fullName == $item)&& (!$space ||($space=="") ||
 ($bentrydoc.getSpace()==$space)) )

 Is it normal to get those kind of messages, and if not, is this a result
...
  of my modification, and how can I fix it? 

 Since I don't really know Velocity, any advice will be highly
 appreciated.

 Thanks,
 Darina

Hi,

The error is not cause by adding $space in there. I think this is an 
error in the original script, but it is not a severe one. You can fix it

if you replace the line with:

#if($bentrydoc && ($bentrydoc.fullName == $item) && (!$space || 
($space=="") || ($bentrydoc.getSpace()==$space)))

-- 
Sergiu Dumitriu
http://purl.org/net/sergiu/
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Re: [xwiki-users] Error on Tomcat console possibly related to adding a second blog