12:21 p.m.
Hi,
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
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