I am upgrading XWIKI from 1.1 to 1.8 in my sites.
And I use Groovy for the user rights module.
When I update the user rights, errors occurs:
Error number 4001 in 4: Error while parsing velocity page
MyNetcipia.PlaceRightsConfirmation
Wrapped Exception: Failed to evaluate content with id Place Rights
Confirmation
com.xpn.xwiki.XWikiException: Error number 4001 in 4: Error while parsing
velocity page MyNetcipia.PlaceRightsConfirmation
Wrapped Exception: Failed to evaluate content with id Place Rights
Confirmation
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:114)
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.render(XWikiVelocityRenderer.java:85)
        at
com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:272)
        at
com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:202)
        at
com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:170)
        at
com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderDocument(DefaultXWikiRenderingEngine.java:159)
        at
com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:525)
        at com.xpn.xwiki.api.Document.getRenderedContent(Document.java:450)
        at sun.reflect.GeneratedMethodAccessor261.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$VelMethodImpl.invoke(UberspectImpl.java:295)
        at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245)
        at
org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203)
        at
org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
        at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
        at
org.xwiki.velocity.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:178)
        at
org.xwiki.velocity.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:143)
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:108)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1662)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1612)
        at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:696)
        at sun.reflect.GeneratedMethodAccessor96.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295)
        at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245)
        at
org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203)
        at
org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
        at
org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:194)
        at
org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)
        at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
        at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88)
        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(ASTIfStatement.java:107)
        at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
        at
org.xwiki.velocity.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:178)
        at
org.xwiki.velocity.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:143)
        at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:108)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1662)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1612)
        at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:124)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:242)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:122)
        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.doGet(ActionServlet.java:414)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at
com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:145)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:111)
        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:68)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at
com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:295)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at
com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112)
        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:175)
        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:263)
        at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
        at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
        at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)
        at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)
        at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
        at java.lang.Thread.run(Thread.java:619)
Wrapped Exception:
org.apache.velocity.exception.MethodInvocationException: Invocation of
method 'updateRights' in class PlaceManager threw exception
java.lang.NullPointerException: Cannot invoke method getDocument() on null
object @ MyNetcipia.PlaceRightsConfirmation11,15
at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:286)
at
org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203)
at
org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReference.java:396)
at
org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpression.java:64)
at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:86)
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(ASTIfStatement.java:107)
at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
at
org.xwiki.velocity.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:178)
at
org.xwiki.velocity.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:143)
at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:108)
at
com.xpn.xwiki.render.XWikiVelocityRenderer.render(XWikiVelocityRenderer.java:85)
at
com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:272)
 at
com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:202)
 at
com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:170)
 at
com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderDocument(DefaultXWikiRenderingEngine.java:159)
 at
com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:525)
 at com.xpn.xwiki.api.Document.getRenderedContent(Document.java:450)
 at sun.reflect.GeneratedMethodAccessor261.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$VelMethodImpl.invoke(UberspectImpl.java:295)
 at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245)
 at
org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203)
 at
org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294)
 at
org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
 at
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107)
 at org.apache.velocity.runtime.parser.node.SimpleNode.r
 ender(SimpleNode.java:318) at
org.xwiki.velocity.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:178)
at org.xwiki.vel
 ocity.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:143) at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWik
 iVelocityRenderer.java:108) at
com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1662) at
com.xpn.xwiki.XWiki.parseTemplate(XWiki.jav
 a:1612) at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:696) at
sun.reflect.GeneratedMethodAccessor96.invoke(Unknown Source)
  at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Met
  hod.java:597) at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295)
at org.apach
  e.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245) at
org.apache.velocity.runtime.parser.node.ASTReference.exe
  cute(ASTReference.java:203) at
org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294)
at org.apache.
  velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at
org.apache.velocity.runtime.directive.VelocimacroProxy.
  render(VelocimacroProxy.java:194) at
org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)
at org
  .apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at
org.apache.velocity.runtime.parser.node.ASTIfStatement.re
  nder(ASTIfStatement.java:88) 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(AST
  IfStatement.java:107) at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
at org.xwiki.velocity.De
  faultVelocityEngine.evaluate(DefaultVelocityEngine.java:178) at
org.xwiki.velocity.DefaultVelocityEngine.evaluate(DefaultVelocit
  yEngine.java:143) at
com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:108)
at com.xpn.xwiki.XWiki.
  parseTemplate(XWiki.java:1662) at
com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1612) at
com.xpn.xwiki.web.Utils.parseTemplate(Ut
  ils.java:124) at
com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:242) at
com.xpn.xwiki.web.XWikiAction.execute(XWikiActio
  n.java:122) at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
at org.apache.struts.ac
  tion.RequestProcessor.process(RequestProcessor.java:236) at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:11
  96) at
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) at
javax.servlet.http.HttpServlet.service(HttpServle
  t.java:690) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at
org.apache.catalina.core.ApplicationFilterChain.i
  (ApplicationFilterChain.java:290) at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
a
  t
com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:145)
at org.apache.catalina.core.Applicati
  onFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at
org.apache.catalina.core.ApplicationFilterChain.doFilter(Appl
  icationFilterChain.java:206) at
com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:111) at
org.apache.catalina.core.Appli
  cationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at
org.apache.catalina.core.ApplicationFilterChain.doFilter(
  .java:206) at
com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:68)
at org.apache.catalina.core.Applicatio
  nFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at
org.apache.catalina.core.ApplicationFilterChain.doFilter(Appli
  cationFilterChain.java:206) at
com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:295)
at org
.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.Appli
  cationFilterChain.doFilter(ApplicationFilterChain.java:206) at
com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacte
  rEncodingFilter.java:112) 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.Standa
  rdWrapperValve.invoke(StandardWrapperValve.java:233) at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
  e.java:175) at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.Error
  ReportValve.invoke(ErrorReportValve.java:102) at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:10
  9) at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.jk.server.JkCoyoteHandler.invoke
  (JkCoyoteHandler.java:190) at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283) at
org.apache.jk.common.Channe
  lSocket.invoke(ChannelSocket.java:767) at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)
at org.ap
ache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)
at org.apache.tomcat.util.threads.ThreadPool$Control
  Runnable.run(ThreadPool.java:690) at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException: Cannot invoke method
getDocument() on null object
at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:77)
at
org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:748)
at
org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:725)
at
org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:17)
at
org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:43)
at
org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
 at
org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:129)
 at PlaceManager.updateRights(script1247022056918.groovy:622)
 at PlaceManager$updateRights.callCurrent(Unknown Source)
 at
org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:47)
 at
org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:143)
 at
org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:151)
 at PlaceManager.updateRights(script1247022056918.groovy:712)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295)
 at
org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245)
 … 95 more
I see one sentence:
Wrapped Exception:
org.apache.velocity.exception.MethodInvocationException: Invocation of
method 'updateRights' in class PlaceManager threw exception
java.lang.NullPointerException: Cannot invoke method getDocument() on null
object @ MyNetcipia.PlaceRightsConfirmation11,15
I find there is null in Groovy:(Italic and bold are null value)
public boolean updateRights(String space) {
    Document doc = new
Document(wiki.xWiki.</b>getDocument(getRightsPage(space),context.context),context.context)
    if ((doc!=null)&&(!doc.isNew())) {
     for (obj in doc.getObjects("XWiki.XWikiGlobalRights")) {
       doc.removeObject(obj)
     }
    doc.saveWithProgrammingRights()
    }
    boolean update = false;
    if (doc!=null) {
    update |= updateRights(space, "view",
doc.newObject("XWiki.XWikiGlobalRights"))
    update |= updateRights(space, "edit",
doc.newObject("XWiki.XWikiGlobalRights"))
    update |= updateRights(space, "comment",
doc.newObject("XWiki.XWikiGlobalRights"))
     if (space=="") {
       // Make sur the admin rights is set
       update |= addAdminRights(doc.newObject("XWiki.XWikiGlobalRights"))
     }
    } else
     return false;
    if (update)
     doc.saveWithProgrammingRights()
     return true;
  }
But I cannot find which causes the null value and how to avoid this.
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