freemarker templating for task forms: outcome (transitions) vs. outcome (result) clash -------------------------------------------------------------------------------------- Key: JBPM-2452 URL: https://jira.jboss.org/jira/browse/JBPM-2452 Project: JBoss jBPM Issue Type: Bug Security Level: Public(Everyone can see) Components: Runtime Engine Affects Versions: jBPM 4.0 Environment: Deployed in Jboss 5.1.0.GA on Windows XP. Reporter: Marko Friedemann Assignee: Heiko Braun Fix For: jBPM 4.1 In the freemarker-based templating mechanism for task forms, 'outcome' is both "a default context information for templates". and "reserved field name for signaling execution". Additionaly, "form field names become process variables and vice-versa". (See http://www.jboss.org/index.html?module=bb&op=viewtopic&t=155048.) ,-- example code in the documentation -- | <#list outcome.values as transition> | <input type="submit" name="outcome" value="${transition}"> | </#list> `-------------------- This code works exactly once. If used a second time, outcome will have become a process variable and therefore the result is an exception like: 2009-07-23 15:18:44,485 ERROR [freemarker.runtime] (http-127.0.0.1-8080-4) Expected hash. outcome evaluated instead to freemarker.template.SimpleScalar on line 5, column 32 in review.ftl. The problematic instruction: ---------- ==> list outcome.values as transition [on line 5, column 25 in review.ftl] ---------- Java backtrace for programmers: ---------- freemarker.template.TemplateException: Expected hash. outcome evaluated instead to freemarker.template.SimpleScalar on line 5, column 32 in review.ftl. at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:135) at freemarker.core.Dot._getAsTemplateModel(Dot.java:78) at freemarker.core.Expression.getAsTemplateModel(Expression.java:89) at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94) at freemarker.core.Environment.visit(Environment.java:209) at freemarker.core.MixedContent.accept(MixedContent.java:92) at freemarker.core.Environment.visit(Environment.java:209) at freemarker.core.Environment.process(Environment.java:189) at freemarker.template.Template.process(Template.java:237) at org.jbpm.integration.console.forms.AbstractFormDispatcher.processTemplate(AbstractFormDispatcher.java:116) at org.jbpm.integration.console.forms.TaskFormDispatcher.provideForm(TaskFormDispatcher.java:161) at org.jbpm.integration.console.forms.FormDispatcherComposite.provideForm(FormDispatcherComposite.java:65) at sun.reflect.GeneratedMethodAccessor312.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.bpm.console.server.util.InvocationProxy.invoke(InvocationProxy.java:64) at $Proxy291.provideForm(Unknown Source) at org.jboss.bpm.console.server.FormProcessingFacade.provideForm(FormProcessingFacade.java:181) at org.jboss.bpm.console.server.FormProcessingFacade.renderTaskUI(FormProcessingFacade.java:120) at sun.reflect.GeneratedMethodAccessor311.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.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(DispatcherUtilities.java:142) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:173) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:93) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:68) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) 2009-07-23 15:18:44,485 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/gwt-console-server].[Resteasy]] (http-127.0.0.1-8080-4) Servlet.service() for servlet Resteasy threw exception org.jboss.resteasy.spi.UnhandledException: java.lang.RuntimeException: Unexpected invocation exception: null at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:319) at org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:230) at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:206) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:360) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:173) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:93) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:68) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) 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(InvocationProxy.java:80) at $Proxy291.provideForm(Unknown Source) at org.jboss.bpm.console.server.FormProcessingFacade.provideForm(FormProcessingFacade.java:181) at org.jboss.bpm.console.server.FormProcessingFacade.renderTaskUI(FormProcessingFacade.java:120) at sun.reflect.GeneratedMethodAccessor311.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.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(DispatcherUtilities.java:142) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356) ... 28 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.GeneratedMethodAccessor312.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.bpm.console.server.util.InvocationProxy.invoke(InvocationProxy.java:64) ... 40 more Caused by: java.lang.RuntimeException: Failed to process task template at org.jbpm.integration.console.forms.AbstractFormDispatcher.processTemplate(AbstractFormDispatcher.java:149) at org.jbpm.integration.console.forms.TaskFormDispatcher.provideForm(TaskFormDispatcher.java:161) at org.jbpm.integration.console.forms.FormDispatcherComposite.provideForm(FormDispatcherComposite.java:65) ... 44 more Caused by: freemarker.template.TemplateException: Expected hash. outcome evaluated instead to freemarker.template.SimpleScalar on line 5, column 32 in review.ftl. at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:135) at freemarker.core.Dot._getAsTemplateModel(Dot.java:78) at freemarker.core.Expression.getAsTemplateModel(Expression.java:89) at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94) at freemarker.core.Environment.visit(Environment.java:209) at freemarker.core.MixedContent.accept(MixedContent.java:92) at freemarker.core.Environment.visit(Environment.java:209) at freemarker.core.Environment.process(Environment.java:189) at freemarker.template.Template.process(Template.java:237) at org.jbpm.integration.console.forms.AbstractFormDispatcher.processTemplate(AbstractFormDispatcher.java:116) ... 46 more