NullPointerException with Seam and JBPM
I am deploying an application with Seam and JBPM using both process and page definitions. When I try to access the page that kicks everything off, I get the following:
21 Apr 2008 13:49:02,826: DEBUG org.jboss.seam.Component - instantiating Seam component: org.jboss.seam.bpm.taskInstance 21 Apr 2008 13:49:02,826: DEBUG org.jboss.seam.Component - initializing new instance of: org.jboss.seam.bpm.taskInstance 21 Apr 2008 13:49:02,826: DEBUG org.jboss.seam.Component - done initializing: org.jboss.seam.bpm.taskInstance 21 Apr 2008 13:49:02,846: ERROR org.jboss.seam.jsf.SeamPhaseListener - uncaught exception java.lang.NullPointerException at org.jboss.seam.bpm.BusinessProcess.startTask(BusinessProcess.java:167) at org.jboss.seam.navigation.TaskControl.beginOrEndTask(TaskControl.java:36) at org.jboss.seam.navigation.Page.preRender(Page.java:243) at org.jboss.seam.navigation.Pages.preRender(Pages.java:309) at org.jboss.seam.jsf.SeamPhaseListener.preRenderPage(SeamPhaseListener.java:544) at org.jboss.seam.jsf.SeamPhaseListener.beforeRenderResponse(SeamPhaseListener.java:455) at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:146) at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:116) at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:222) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:223) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:44) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:141) at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:281) at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
Here is my process definition file:
<process-definition name="orderProcess" xmlns="urn:jbpm.org:jpdl-3.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:jbpm.org:jpdl-3.1 http://jbpm.org/xsd/jpdl-3.1.xsd"> <start-state name="start"> <transition to="SalesOrder"/> </start-state> <task-node name="SalesOrder"> <task name="Shop" description="Shop"> <assignment actor-id="sales"/> </task> <transition to="done"/> </task-node> <end-state name="done"/> </process-definition>
Finally, here is my page definition file:
<pageflow-definition xmlns="http://jboss.com/products/seam/pageflow"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://jboss.com/products/seam/pageflow http://jboss.com/products/seam/pageflow-2.0.xsd"
name="orderPageflow">
<start-page name="shoppingPage" view-id="/sales/shop.jspx">
<redirect/>
<transition name="addWidgetIfAvailable" to="shoppingPage">
<action expression="#{orderAction.addWidgetToOrder}" />
</transition>
<transition name="guess" to="confirm"/>
</start-page>
<page name="confirm" view-id="/sales/confirm.jspx">
<end-conversation/>
<redirect/>
</page>
</pageflow-definition>
Both files are located in WEB-INF/classes.
Any insight into why the task is null is much appreciated.
Thanks.