Using the 1.4 trunk and JBoss 4.0.3: This exception occurs from time to time 
in different parts of the application. It appears to be a "thread race" issue 
because

- it does not occur always
- it does not occur in the same place
- it can dissappear after the page is refreshed a couple of times

Any ideas much appreciated. Below is the server log after the 
http://localhost:8080/lenya/default/admin/index.html url is accessed.

13:30:21,628 INFO  [sitemap] Redirecting to 'null/default/admin/index.html'
13:30:21,628 INFO  [access] 'default/admin/index.html' Processed by 
Apache Cocoon 2.1.8-rc1 in 616 milliseconds.
13:30:21,643 ERROR [handled-errors] java.lang.NullPointerException
org.apache.lenya.ac.AccessControlException: java.lang.NullPointerException
        at 
org.apache.lenya.cms.ac.DocumentPolicyManagerWrapper.getPolicyURL(DocumentPolicyManagerWrapper.java:99)
        at 
org.apache.lenya.cms.ac.DocumentPolicyManagerWrapper.getPolicy(DocumentPolicyManagerWrapper.java:212)
        at 
org.apache.lenya.ac.impl.PolicyAuthorizer.authorizePolicy(PolicyAuthorizer.java:109)
        at 
org.apache.lenya.ac.impl.PolicyAuthorizer.authorize(PolicyAuthorizer.java:170)
        at 
org.apache.lenya.ac.impl.PolicyAuthorizer.authorize(PolicyAuthorizer.java:92)
        at 
org.apache.lenya.ac.impl.DefaultAccessController.authorize(DefaultAccessController.java:116)
        at 
org.apache.lenya.ac.impl.BypassableAccessController.authorize(BypassableAccessController.java:155)
        at 
org.apache.lenya.cms.cocoon.acting.DelegatingAuthorizerAction.doAct(DelegatingAuthorizerAction.java:68)
        at 
org.apache.lenya.cms.cocoon.acting.AccessControlAction.act(AccessControlAction.java:86)
        at 
org.apache.lenya.cms.cocoon.acting.DelegatingAuthorizerAction.act(DelegatingAuthorizerAction.java:50)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode.invoke(ActTypeNode.java:124)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.SelectNode.invoke(SelectNode.java:102)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:46)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:142)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:92)
        at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:234)
        at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:176)
        at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:248)
        at org.apache.cocoon.Cocoon.process(Cocoon.java:679)
        at 
org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1154)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at 
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at 
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
        at 
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
        at 
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
        at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at 
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
        at java.lang.Thread.run(Thread.java:534)
Caused by: java.lang.NullPointerException
        at 
org.apache.lenya.cms.repository.RepositoryUtil.getSession(RepositoryUtil.java:30)
        at 
org.apache.lenya.cms.ac.DocumentPolicyManagerWrapper.getPolicyURL(DocumentPolicyManagerWrapper.java:84)
        ... 43 more
13:30:21,728 INFO  [sitemap] Processing handle-errors at 
<map:handle-errors> - 
file:/opt/jboss-4.0.3/server/default/./deploy/lenya.war/sitemap.xmap:547:26
13:30:22,190 INFO  [access] 
'default/admin/null/default/admin/index.html' Processed by Apache Cocoon 
2.1.8-rc1 in 559 milliseconds.

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