pageflow NPE: redirect to page with request parameters
mgombocz Feb 26, 2007 1:21 PMHi,
I've defined a simple 2-step pageflow for creating new users in my app:
* The 1st page "editUser.xhtml" is just for entering basic information.
* On my 2nd page (editUserRoles.xhtml) several roles can be assigned.
* There's a <s:link> with action="save" which selects a transition that calls #{userManager.flush}.
* This transition leads to view "showUser.xhtml" which requires the page parameter "userId".
But before "showUser.xhtml" is being rendered a NPE occurs. Please see following trace starting right after Hibernate's DB operations:
2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] outjecting dependencies of: userManager 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] instantiating Seam component: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] initializing new instance of: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] done initializing: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] instantiating Seam component: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] initializing new instance of: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] done initializing: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.core.Events] Processing event:org.jboss.seam.preSetVariable.user 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] instantiating Seam component: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] initializing new instance of: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] done initializing: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] instantiating Seam component: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] initializing new instance of: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] done initializing: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.core.Events] Processing event:org.jboss.seam.postSetVariable.user 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] disinjecting dependencies of: userManager 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.util.Naming] JNDI InitialContext properties:{java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory, java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces} 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.contexts.Contexts] found in conversation context: org.jboss.seam.core.persistenceContexts 2007-02-26 18:49:22,015 DEBUG [org.jbpm.graph.def.GraphElement] event 'node-enter' on 'Page(finished)' for 'Token(/)' 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.core.Manager] Ending long-running conversation 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] instantiating Seam component: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] initializing new instance of: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] done initializing: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] instantiating Seam component: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] initializing new instance of: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.Component] done initializing: org.jboss.seam.core.events 2007-02-26 18:49:22,015 DEBUG [org.jboss.seam.core.Events] Processing event:org.jboss.seam.endConversation 2007-02-26 18:49:22,015 DEBUG [org.jbpm.graph.def.GraphElement] event 'after-signal' on 'Page(enterRoles)' for 'Token(/)' 2007-02-26 18:49:22,015 DEBUG [org.jbpm.JbpmContext] closing JbpmContext 2007-02-26 18:49:22,015 ERROR [org.jboss.seam.jsf.SeamPhaseListener] uncaught exception java.lang.NullPointerException at org.jboss.seam.core.Pages.getConvertedParameters(Pages.java:556) at org.jboss.seam.core.Pages.encodePageParameters(Pages.java:692) at org.jboss.seam.core.Manager.redirect(Manager.java:972) at org.jboss.seam.core.Manager.redirect(Manager.java:948) at org.jboss.seam.core.Pageflow.redirect(Pageflow.java:221) at org.jboss.seam.core.Pageflow.navigate(Pageflow.java:209) at org.jboss.seam.core.Pageflow.navigate(Pageflow.java:299) at org.jboss.seam.jsf.SeamNavigationHandler.handleNavigation(SeamNavigationHandler.java:30) at org.jboss.seam.core.Pages.handleOutcome(Pages.java:425) at org.jboss.seam.core.Pages.callAction(Pages.java:473) at org.jboss.seam.core.Pages.enterPage(Pages.java:275) at org.jboss.seam.jsf.AbstractSeamPhaseListener.enterPage(AbstractSeamPhaseListener.java:242) at org.jboss.seam.jsf.AbstractSeamPhaseListener.beforeRender(AbstractSeamPhaseListener.java:193) at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:57) at org.apache.myfaces.lifecycle.PhaseListenerManager.informPhaseListenersBefore(PhaseListenerManager.java:70) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:373) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:138) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:63) at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:57) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:79) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:75) at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:213) 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:96) 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.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) 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:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) 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:595)
Here's my jPDL:
<pageflow-definition name="createUser"> <start-page name="createUser" view-id="/editUser.xhtml"> <description>Create new user</description> <transition name="cancel" to="cancelled" /> <transition name="save" to="enterRoles"> <action expression="#{userManager.save}" /> </transition> </start-page> <page name="enterRoles" view-id="/editUserRoles.xhtml"> <description>Assign roles</description> <redirect /> <transition name="save" to="finished"> <action expression="#{userManager.flush}" /> </transition> <transition name="cancel" to="cancelled" /> </page> <page name="finished" view-id="/showUser.xhtml"> <redirect /> <end-conversation /> </page> <page name="cancelled" view-id="/searchUser.xhtml"> <redirect /> <end-conversation /> </page> </pageflow-definition>
Here's an excerpt from pages.xml:
<pages no-conversation-view-id="/error.xhtml" login-view-id="/login.xhtml"> ... <page view-id="/searchUser.xhtml" login-required="true"> <param name="firstResult" value="#{users.firstResult}"/> <param name="username" value="#{exampleUser.username}"/> <navigation from-action="#{userManager.create}" > <begin-conversation pageflow="createUser" flush-mode="manual" /> <redirect view-id="/editUser.xhtml" /> </navigation> </page> <page view-id="/showUser.xhtml" login-required="true"> <param name="userId" value="#{user.id}" /> <navigation> <rule if-outcome="editUser"> <begin-conversation /> <redirect view-id="/editUser.xhtml" /> </rule> <rule if-outcome="editUserRoles"> <begin-conversation flush-mode="manual" /> <redirect view-id="/editUserRoles.xhtml" /> </rule> </navigation> </page> <page view-id="/editUser.xhtml" login-required="true" conversation-required="true"> <navigation from-action="#{userManager.save}"> <end-conversation /> <redirect view-id="/showUser.xhtml" /> </navigation> <navigation> <rule if-outcome="save"> <end-conversation /> <redirect view-id="/showUser.xhtml" /> </rule> <rule if-outcome="cancel" if="#{not userManager.newlyCreated}"> <end-conversation/> <redirect view-id="/showUser.xhtml" /> </rule> </navigation> </page> <page view-id="/editUserRoles.xhtml" login-required="true" conversation-required="true"> <navigation from-action="#{userManager.flush}"> <end-conversation /> <redirect view-id="/showUser.xhtml" /> </navigation> <navigation> <rule if-outcome="cancel" if="#{not userManager.newlyCreated}"> <end-conversation before-redirect="true"/> <redirect view-id="/showUser.xhtml" /> </rule> </navigation> </page> ... </pages>
Non-pageflow, but conversational, operations e.g. submitting "editUserRoles.xhtml" for exisiting users redirects to "showUser.xhtml" without any errors.
Is there anything that I am probably doing wrong?
Thanks!
Manuel