When I try this file with the following changes, which are slight, JBoss throws 
an exception. A null pointer exception in the StrategyFactory object. Do you 
know why.... or how I could go about debugging this..

Here is my helloworld-portal.xml file:

<?xml version="1.0" encoding="UTF-8"?>
  | <!-- http://localhost:8080/portal/test/index.html -->
  | <portal>
  |   <portal-name>test</portal-name>
  | 
  |   <properties>
  |     <!-- Set the default window for request of the type /a/b/c -->
  |     <property>
  |       <name>org.jboss.portal.property.action</name>
  |       <value>MyPortletWindow</value>
  |     </property>
  |     <!-- Set the layout for the default portal -->
  |     <!-- see also portal-layouts.xml -->
  |     <property>
  |       <name>org.jboss.portal.property.layout</name>
  |       <value>simple-layout-two-column</value>
  |     </property>
  |     <!-- set the default render set name (used by the render tag in 
layouts) -->
  |     <!-- see also portal-renderSet.xml -->
  |     <property>
  |       <name>org.jboss.portal.property.renderSet</name>
  |       <value>divRenderer</value>
  |     </property>
  |     <!-- set the default strategy name (used by the strategy interceptor) 
-->
  |     <!-- see also portal-strategies.xml -->
  |     <property>
  |       <name>org.jboss.portal.property.strategy</name>
  |       <value>default</value>
  |     </property>
  |   </properties>
  | 
  |   <supported-modes>
  |     <mode>VIEW</mode>
  |     <mode>EDIT</mode>
  |     <mode>HELP</mode>
  |   </supported-modes>
  | 
  |   <supported-window-states>
  |     <window-state>NORMAL</window-state>
  |     <window-state>MINIMIZED</window-state>
  |     <window-state>MAXIMIZED</window-state>
  |   </supported-window-states>
  | 
  |   <pages>
  | 
  |     <default-page>default</default-page>
  | 
  |     <page>
  |       <page-name>default</page-name>
  |       <window>
  |         <window-name>MyPortletWindow</window-name>
  |         
<instance-ref>helloworld.HelloWorldPortlet.HelloWorldPortletInstance</instance-ref>
  |         <region>top.left</region>
  |         <height>0</height>
  |       </window>
  |     </page>
  | 
  |   </pages>
  | </portal>
  |     


Here is the exception.


  | 14:10:05,795 INFO  [STDOUT] WURFL has been initialized
  | 14:10:05,889 ERROR [CoreServlet] Exception caught in processing servlet
  | java.lang.NullPointerException
  |         at 
org.jboss.portal.core.theme.strategy.StrategyFactory.createStrategyContext(StrategyFactory.java:55)
  |         at 
org.jboss.portal.core.invocation.StrategyInterceptor.invoke(StrategyInterceptor.java:141)
  |         at 
org.jboss.portal.server.impl.invocation.InvocationImpl.invokeNext(InvocationImpl.java:213)
  |         at 
org.jboss.portal.core.invocation.ViewInterceptor.invoke(ViewInterceptor.java:118)
  |         at 
org.jboss.portal.server.impl.invocation.InvocationImpl.invokeNext(InvocationImpl.java:213)
  |         at 
org.jboss.portal.server.invocation.portal.TargetInterceptor.invoke(TargetInterceptor.java:153)
  |         at 
org.jboss.portal.server.impl.invocation.InvocationImpl.invokeNext(InvocationImpl.java:213)
  |         at 
org.jboss.portal.core.invocation.ContentTypeInterceptor.invoke(ContentTypeInterceptor.java:117)
  |         at 
org.jboss.portal.server.impl.invocation.InvocationImpl.invokeNext(InvocationImpl.java:213)
  |         at 
org.jboss.portal.core.invocation.UserContextInterceptor.invoke(UserContextInterceptor.java:92)
  |         at 
org.jboss.portal.server.impl.invocation.InvocationImpl.invokeNext(InvocationImpl.java:213)
  |         at 
org.jboss.portal.server.impl.invocation.InvocationImpl.invokeNext(InvocationImpl.java:238)
  |         at 
org.jboss.portal.server.PortalServer.invoke(PortalServer.java:186)
  |         at 
org.jboss.portal.server.servlet.AbstractMainServlet.invoke(AbstractMainServlet.java:78)
  |         at 
org.jboss.portal.server.servlet.AbstractMainServlet.doGet(AbstractMainServlet.java:71)
  |         at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
  |         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.portal.core.servlet.TransactionFilter.doFilter(TransactionFilter.java:79)
  |         at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |         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:153)
  |         at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407)
  |         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)
  | 14:10:05,889 ERROR [[PortalServlet]] Servlet.service() for servlet 
PortalServlet threw exception
  | java.lang.NullPointerException

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