I can reproduce the same issue on several 
myxwiki.org subwikis (but
works well for main wiki), seems to be a general issue.
We really need someone to look at it ASAP, I don't have any time this week.
On Mon, Sep 3, 2012 at 4:36 PM, Jonathan @ Crindau
<Jonathan(a)crindau.org.uk> wrote:
 Hi,
 I am a user of myxwiki (
http://crindau.myxwiki.org [1]) and
 tried to edit a page (adding a link to a page I was about to create). On
 clicking on "SAVE & VIEW" I got the following:
 Detailed information:
  Error number 3201 in 3: Exception while saving document
 crindau:Diary.August 2012
 Wrapped Exception: Error number 13012 in 3:
 Exception while saving links
 Wrapped Exception: Error number 13013 in 3:
 Exception while deleting links
 Wrapped Exception:
 null
 com.xpn.xwiki.XWikiException: Error number 3201 in 3: Exception
 while saving document crindau:Diary.August 2012
 Wrapped Exception: Error
 number 13012 in 3: Exception while saving links
 Wrapped Exception: Error
 number 13013 in 3: Exception while deleting links
 Wrapped Exception:
 null
  at
 com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.java:698)
 at
 com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:177)
 at
 com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:170)
 at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:1392)
  at
 com.xpn.xwiki.web.SaveAction.save(SaveAction.java:163)
  at
 com.xpn.xwiki.web.SaveAction.action(SaveAction.java:180)
  at
 com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:230)
  at
 com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:116)
  at
 org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.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.doPost(ActionServlet.java:432)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
  at
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
  at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:120)
  at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
 org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:144)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
 org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
 at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
 at
 org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
 at
 org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
 at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:110)
  at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
 org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:144)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
 com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:66)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at
 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
 at
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 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:298)
 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:776)
  at
 org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:705)
 at
 org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:898)
 at
 org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
 at java.lang.Thread.run(Thread.java:662)
 Caused by:
 com.xpn.xwiki.XWikiException: Error number 13012 in 3: Exception while
 saving links
 Wrapped Exception: Error number 13013 in 3: Exception while
 deleting links
 Wrapped Exception: null
  at
 com.xpn.xwiki.store.XWikiHibernateStore.saveLinks(XWikiHibernateStore.java:1869)
 at
 com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.java:684)
 ... 59 more
 Caused by: com.xpn.xwiki.XWikiException: Error number 13013
 in 3: Exception while deleting links
 Wrapped Exception: null
  at
 com.xpn.xwiki.store.XWikiHibernateStore.deleteLinks(XWikiHibernateStore.java:1944)
 at
 com.xpn.xwiki.store.XWikiHibernateStore.saveLinks(XWikiHibernateStore.java:1854)
 ... 60 more
 Caused by: java.lang.NullPointerException
 Wrapped
 Exception:
 com.xpn.xwiki.XWikiException: Error number 13013 in 3:
 Exception while deleting links
 Wrapped Exception: null
  at
 com.xpn.xwiki.store.XWikiHibernateStore.deleteLinks(XWikiHibernateStore.java:1944)
 at
 com.xpn.xwiki.store.XWikiHibernateStore.saveLinks(XWikiHibernateStore.java:1854)
 at
 com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.java:684)
 at
 com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:177)
 at
 com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:170)
 at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:1392)
  at
 com.xpn.xwiki.web.SaveAction.save(SaveAction.java:163)
  at
 com.xpn.xwiki.web.SaveAction.action(SaveAction.java:180)
  at
 com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:230)
  at
 com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:116)
  at
 org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.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.doPost(ActionServlet.java:432)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
  at
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
  at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:120)
  at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
 org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:144)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
 org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
 at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
 at
 org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
 at
 org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
 at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:110)
  at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
 org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:144)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
 com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:66)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at
 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
 at
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 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:298)
 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:776)
  at
 org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:705)
 at
 org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:898)
 at
 org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
 at java.lang.Thread.run(Thread.java:662)
 Caused by:
 java.lang.NullPointerException
 Wrapped
 Exception:
 java.lang.NullPointerException
 Can anyone
 advice?
 Thanks,
 Jonathan
 Links:
 ------
 [1]
 
http://crindau.myxwiki.org/
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--
Thomas Mortagne