This is what I get after first time login as superuser to author instance. Not cool.

ERROR org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/magnoliaAuthor].[default] StandardWrapperValve.java(invoke:260) 07.12.2007 15:18:54 Servlet.service() for servlet default threw exception
info.magnolia.module.admininterface.InvalidTreeHandlerException: Unable to instantiate a tree handler for [website] due to a java.lang.IllegalStateException exception
at info.magnolia.module.admininterface.TreeHandlerManager.getTreeHandler(TreeHandlerManager.java:107)
at info.magnolia.module.admininterface.AdminTreeMVCServlet.getHandler(AdminTreeMVCServlet.java:67)
at info.magnolia.cms.servlets.MVCServlet.doPost(MVCServlet.java:112)
at info.magnolia.cms.servlets.MVCServlet.doGet(MVCServlet.java:69)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at info.magnolia.cms.filters.ServletDispatchingFilter.doFilter(ServletDispatchingFilter.java:137)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:73)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:73)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:64)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:117)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:62)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.cms.cache.CacheFilter.doFilter(CacheFilter.java:134)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:69)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:73)
at info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:84)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:60)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:81)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:62)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:76)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.enterprise.registration.RegistrationFilter.doFilter(RegistrationFilter.java:55)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:73)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:72)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:71)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:64)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:70)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:98)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:195)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:613)
Caused by: java.lang.IllegalStateException: Entry.next=null, data[removeIndex]=info.magnolia.module.admininterface.Navigation-java.util.Map=false previous=info.magnolia.module.admininterface.config.RepositoryConfiguration-java.util.Collection=false key=info.magnolia.module.admininterface.AdminTreeMVCHandler-java.util.Map value=false size=200 maxSize=200 Please check that your keys are immutable, and that you have used synchronization properly. If so, then please report this to commons-dev@jakarta.apache.org as a bug.
at org.apache.commons.collections.map.LRUMap.reuseMapping(LRUMap.java:300)
at org.apache.commons.collections.map.LRUMap.addMapping(LRUMap.java:266)
at org.apache.commons.collections.map.AbstractHashedMap.put(AbstractHashedMap.java:283)
at info.magnolia.cms.util.ClassUtil.isSubClass(ClassUtil.java:116)
at info.magnolia.content2bean.impl.TypeMappingImpl.getTypeDescriptor(TypeMappingImpl.java:170)
at info.magnolia.content2bean.impl.Content2BeanProcessorImpl.setProperties(Content2BeanProcessorImpl.java:132)
at info.magnolia.content2bean.Content2BeanUtil.setProperties(Content2BeanUtil.java:206)
at info.magnolia.content2bean.Content2BeanUtil.setProperties(Content2BeanUtil.java:196)
at info.magnolia.content2bean.Content2BeanUtil.setProperties(Content2BeanUtil.java:189)
at info.magnolia.cms.util.ContentUtil.setProperties(ContentUtil.java:429)
at info.magnolia.module.admininterface.TreeHandlerManager.getTreeHandler(TreeHandlerManager.java:103)
... 62 more