Yes, i read that thread till the end but didn't tried MySql. I tried H2 to be 
sure if it's database related issue but same stack trace. I am planning to use 
that wiki in our server environment. We use weblogic as application server and 
Oracle11g as database server. Actually, after i test standalone version in my 
desktop, i tried to deploy xwiki to weblogic and had several errors. I passed 
all of them and stucked at this one. After that i gave a try to Apache Tomcat 
and same issue. I am trying to make it work for a week but i am desperate now. 
I think, i will use standalone version at the production environment :)

-----Original Message-----
From: users [mailto:users-boun...@xwiki.org] On Behalf Of Clemens 
Klein-Robbenhaar
Sent: Wednesday, June 29, 2016 2:54 PM
To: users@xwiki.org
Subject: Re: [xwiki-users] NullPointerException at HqlSqlWalker.lookupProperty( 
HqlSqlWalker.java:560)

Uh, oh, this looks like this problem reported last year:
http://markmail.org/thread/4iigsjpxdaw2qzzq

the issue went away there when using mySQL - for unknown reasons, so that time 
we did not really find a solution.
hope we can do better this time.


----- Urspr√ľngliche Nachricht -----
Von: Kemalettin Ocak
Am:  Wednesday, 29.06.2016, 12:20
An: Xwiki Users
Betreff: Re: [xwiki-users] NullPointerException at      
HqlSqlWalker.lookupProperty( HqlSqlWalker.java:560)


> Here is the root cause:
> 
> HTTP Status 500 - com.xpn.xwiki.XWikiException: Error number 11007 in 0: 
> Failed to extract Entity Resource Reference from URL 
> [http://localhost:8080/xwiki/bin/view/Main/]
> 
> type Exception report
> 
> message com.xpn.xwiki.XWikiException: Error number 11007 in 0: Failed to 
> extract Entity Resource Reference from URL 
> [http://localhost:8080/xwiki/bin/view/Main/]
> 
> description The server encountered an internal error that prevented it from 
> fulfilling this request.
> 
> exception
> 
> javax.servlet.ServletException: com.xpn.xwiki.XWikiException: Error number 
> 11007 in 0: Failed to extract Entity Resource Reference from URL 
> [http://localhost:8080/xwiki/bin/view/Main/]
>       
> org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:520)
[...]
> 
> root cause
> 
> com.xpn.xwiki.XWikiException: Error number 11007 in 0: Failed to extract 
> Entity Resource Reference from URL 
> [http://localhost:8080/xwiki/bin/view/Main/]
>       com.xpn.xwiki.XWiki.initializeResourceFromURL(XWiki.java:821)
>       com.xpn.xwiki.XWiki.getXWiki(XWiki.java:764)
[...]
> root cause
> 
> java.lang.RuntimeException: Failed to locate wiki descriptor for alias 
> [localhost]
>       
> org.xwiki.url.internal.standard.AbstractWikiReferenceExtractor.getWikiDescriptorByAlias(AbstractWikiReferenceExtractor.java:80)
>       
> org.xwiki.url.internal.standard.DomainWikiReferenceExtractor.resolveDomainBasedWikiReference(DomainWikiReferenceExtractor.java:61)
[...]

here is where the XWQL query is send as HQL query instead of being translated:

> 
> root cause
> 
> org.xwiki.query.QueryException: Exception while executing query. Query 
> statement = [ select doc.fullName from XWikiDocument as doc , BaseObject as 
> _o1 where ( doc.object ( XWiki.XWikiServerClass ) . server = :wikiAlias and 
> doc.name like 'XWikiServer%' ) and doc.fullName=_o1.name and 
> _o1.className='XWiki.XWikiServerClass' ]
>       
> com.xpn.xwiki.store.hibernate.query.HqlQueryExecutor.execute(HqlQueryExecutor.java:175)
>       
> org.xwiki.query.internal.DefaultQueryExecutorManager.execute(DefaultQueryExecutorManager.java:72)
>       org.xwiki.query.internal.DefaultQuery.execute(DefaultQuery.java:287)
>       
> org.xwiki.query.xwql.internal.XWQLQueryExecutor.execute(XWQLQueryExecutor.java:118)
[..]
> root cause
> 
> java.lang.NullPointerException
>       org.hibernate.hql.ast.HqlSqlWalker.lookupProperty(HqlSqlWalker.java:560)
>       
> org.hibernate.hql.antlr.HqlSqlBaseWalker.addrExpr(HqlSqlBaseWalker.java:4774)
>       
> org.hibernate.hql.antlr.HqlSqlBaseWalker.expr(HqlSqlBaseWalker.java:1326)
[...]

 and here the dot in " doc.fullName" or "doc.object" triggers the NPE in the 
hibernate HQL Query parser :-/

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