Problems with Taskforms: forms cannot be found / NullPointer
Hello!
I used the following process to play around with jBPM. Everything worked fine. Lately I added forms to the user tasks. At first just for the first task which is named "request". I could login, open the task and I saw the form. Submitting also worked fine. Afterwards I loggged in as a different user to perform the following tasks and the the form for "hr_review" did not work. Instead an Exception was thrown.
<?xml version="1.0" encoding="UTF-8"?> <process description="Urlaubsantrag zum Test der Process Engine" name="demonstration_vacation_request" xmlns="http://jbpm.org/4.0/jpdl" key="demo" version="1"> <start g="152,6,48,48" name="start1"> <transition g="-72,-19" name="to request" to="request"/> </start> <end g="149,456,48,48" name="end1"/> <task assignee="mary" form="request.ftl" g="130,87,92,52" name="request"> <transition g="-49,-21" name="to fork1" to="fork1"/> </task> <fork g="153,174,48,48" name="fork1"> <transition g="22,-21" name="to proj_review" to="proj_review"/> <transition g="-68,-24" name="to hr_review" to="hr_review"/> </fork> <task assignee="mike" form="proj_review.ftl" g="236,257,92,52" name="proj_review"> <transition g="16,-6" name="to exclusive1" to="decision"/> </task> <java class="Vacation" g="321,349,101,52" method="save" name="save_vacation"> <transition g="-48,-21" name="to end1" to="end1"/> </java> <task assignee="alex" form="hr_review.ftl" g="47,257,92,52" name="hr_review"> <transition g="-105,-13" name="to exclusive1" to="decision"/> </task> <decision g="155,341,48,48" name="decision"> <handler class="Evaluation" /> <transition g="-48,-21" name="to end1" to="end1"/> <transition g="-51,-21" name="to save_vacation" to="save_vacation"/> </decision> </process>
13:00:08,481 ERROR [[Resteasy]] Servlet.service() for servlet Resteasy threw exc eption org.jboss.resteasy.spi.UnhandledException: java.lang.RuntimeException: Unexpecte d invocation exception: null at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationExcept ion(SynchronousDispatcher.java:319) at org.jboss.resteasy.core.SynchronousDispatcher.handleException(Synchro nousDispatcher.java:230) at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException( SynchronousDispatcher.java:206) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispa tcher.java:360) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispa tcher.java:173) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.servi ce(HttpServletDispatcher.java:93) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.servi ce(HttpServletDispatcher.java:68) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) at org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilte r.java:59) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi lter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV alve.java:235) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV alve.java:191) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit yAssociationValve.java:190) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica torBase.java:433) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv e.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.proce ss(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invok e(SecurityContextEstablishmentValve.java:70) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j ava:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j ava:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedC onnectionValve.java:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal ve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav a:330) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java :828) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce ss(Http11Protocol.java:601) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:44 7) at java.lang.Thread.run(Thread.java:619) Caused by: java.lang.RuntimeException: Unexpected invocation exception: null at org.jboss.bpm.console.server.util.InvocationProxy.invoke(InvocationPr oxy.java:80) at $Proxy143.provideForm(Unknown Source) at org.jboss.bpm.console.server.FormProcessingFacade.provideForm(FormPro cessingFacade.java:181) at org.jboss.bpm.console.server.FormProcessingFacade.renderTaskUI(FormPr ocessingFacade.java:120) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl. java:117) at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod. java:260) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:232 ) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:166 ) at org.jboss.resteasy.core.DispatcherUtilities.getJaxrsResponse(Dispatch erUtilities.java:142) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispa tcher.java:356) ... 28 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.bpm.console.server.util.InvocationProxy.invoke(InvocationPr oxy.java:64) ... 41 more Caused by: java.lang.NullPointerException at org.jbpm.integration.console.forms.TaskFormDispatcher.provideForm(Tas kFormDispatcher.java:149) at org.jbpm.integration.console.forms.FormDispatcherComposite.provideFor m(FormDispatcherComposite.java:65) ... 46 more 13:00:08,559 ERROR [[Resteasy]] Servlet.service() for servlet Resteasy threw exc eption org.jboss.resteasy.spi.UnhandledException: java.lang.RuntimeException: Unexpecte d invocation exception: null at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationExcept ion(SynchronousDispatcher.java:319) at org.jboss.resteasy.core.SynchronousDispatcher.handleException(Synchro nousDispatcher.java:230) at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException( SynchronousDispatcher.java:206) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispa tcher.java:360) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispa tcher.java:173) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.servi ce(HttpServletDispatcher.java:93) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.servi ce(HttpServletDispatcher.java:68) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) at org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilte r.java:59) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi lter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV alve.java:235) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV alve.java:191) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit yAssociationValve.java:190) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica torBase.java:433) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv e.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.proce ss(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invok e(SecurityContextEstablishmentValve.java:70) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j ava:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j ava:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedC onnectionValve.java:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal ve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav a:330) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java :828) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce ss(Http11Protocol.java:601) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:44 7) at java.lang.Thread.run(Thread.java:619) Caused by: java.lang.RuntimeException: Unexpected invocation exception: null at org.jboss.bpm.console.server.util.InvocationProxy.invoke(InvocationPr oxy.java:80) at $Proxy143.provideForm(Unknown Source) at org.jboss.bpm.console.server.FormProcessingFacade.provideForm(FormPro cessingFacade.java:181) at org.jboss.bpm.console.server.FormProcessingFacade.renderTaskUI(FormPr ocessingFacade.java:120) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl. java:117) at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod. java:260) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:232 ) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:166 ) at org.jboss.resteasy.core.DispatcherUtilities.getJaxrsResponse(Dispatch erUtilities.java:142) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispa tcher.java:356) ... 28 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.bpm.console.server.util.InvocationProxy.invoke(InvocationPr oxy.java:64) ... 41 more Caused by: java.lang.NullPointerException at org.jbpm.integration.console.forms.TaskFormDispatcher.provideForm(Tas kFormDispatcher.java:149) at org.jbpm.integration.console.forms.FormDispatcherComposite.provideFor m(FormDispatcherComposite.java:65) ... 46 more
Here are the two forms. The first one is taken from one of the examples.
<html>
<body>
<h2>How many days would you like to go on vacation?</h2>
<form action="${form.action}" method="POST" enctype="multipart/form-data">
<select name="number_of_days">
<option value="3">3 days</option>
<option value="5">5 days</option>
<option value="10">10 days</option>
</select><br>
<#list outcome.values as transition>
<input type="submit" name="outcome" value="${transition}">
</#list>
</form>
</body>
</html>
<html>
<body>
<h2>[Human Resources]Do you approve the vacation request?</h2>
<form action="${form.action}" method="POST" enctype="multipart/form-data">
<select name="acceptance_hr">
<option value="yes">yes</option>
<option value="no">no</option>
</select><br>
<#list outcome.values as transition>
<input type="submit" name="outcome" value="${transition}">
</#list>
</form>
</body>
</html>
I am kind of confused since I do not really see a difference which would explain why the first one works properly and the second one does not.
Any hints?
