Using jBPM EL in Seam

[vanyatka]

Hi,

I've asked this on jBPM forum, but I feel this issue might be more related to Seam than to jBPM, so let me post it here as well.

The general question idea is how Seam EL corresponds to jBPM EL used in process definitions?
For example, in the jPDL decision node I'd like to use jbpm context variable.

<decision name="check banner list" expression="#{bannersCount}">
     <transition to="select stub" name="no banners found"></transition>
     <transition to="select banner" name="banners found"></transition>
</decision>

The bannerCount variable defined in the Seam as

@Out(scope = ScopeType.BUSINESS_PROCESS, required = false)
private String bannersCount;     

But I get this error:

13:28:46,887 FATAL [application] javax.ejb.EJBTransactionRolledbackException: Identity 'bannersCount' does not reference a MethodExpression instance, returned type: java.lang.String
javax.faces.el.EvaluationException: javax.ejb.EJBTransactionRolledbackException: Identity 'bannersCount' does not reference a MethodExpression instance, returned type: java.lang.String

Regarding to bannersCount, should it be handed by Seam EL or jBPM EL? Who's in charge of resolving the variable and where to find the docs on using EL in process definitions?

Thanks for your help.

[pmuir]

If you use Seam with jBPM, then Seam deals with EL resolution.

Post the full stack trace

[vanyatka]

Sure, the dump is below. In fact it is even longer, but it is full of dupes, the same block keeps repeating many times.

I have to say that everything works fine if EL points to

#{mycomponent.bannersCount}

But I don't the meaning of defining a variable in BUSINESS_CONTEXT then.

22:23:29,793 FATAL [application] javax.ejb.EJBTransactionRolledbackException: Identity 'bannersCount' does not reference a MethodExpression instance, returned type: java.lang.String
javax.faces.el.EvaluationException: javax.ejb.EJBTransactionRolledbackException: Identity 'bannersCount' does not reference a MethodExpression instance, returned type: java.lang.String
        at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:91)
        at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:91)
        at javax.faces.component.UICommand.broadcast(UICommand.java:383)
        at org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:184)
        at org.ajax4jsf.component.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:162)
        at org.ajax4jsf.component.AjaxViewRoot.processApplication(AjaxViewRoot.java:350)
        at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:97)
        at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
        at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
        at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
        at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
        at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
        at org.jboss.seam.servlet.SeamFilter$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.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
        at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
        at java.lang.Thread.run(Thread.java:619)
Caused by: javax.ejb.EJBTransactionRolledbackException: Identity 'bannersCount' does not reference a MethodExpression instance, returned type: java.lang.String
        at org.jboss.ejb3.tx.Ejb3TxPolicy.handleInCallerTx(Ejb3TxPolicy.java:87)
        at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:130)
        at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:195)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
        at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
        at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
        at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
        at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
        at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
        at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
        at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:240)
        at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:210)
        at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:84)
        at $Proxy302.newChain(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
        at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
        at org.jboss.seam.intercept.ClientSideInterceptor$1.proceed(ClientSideInterceptor.java:76)
        at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
        at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
        at org.jboss.seam.intercept.ClientSideInterceptor.invoke(ClientSideInterceptor.java:54)
        at org.javassist.tmp.java.lang.Object_$$_javassist_2.newChain(Object_$$_javassist_2.java)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:329)
        at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:342)
        at org.jboss.el.parser.AstPropertySuffix.invoke(AstPropertySuffix.java:58)
        at org.jboss.el.parser.AstValue.invoke(AstValue.java:96)
        at org.jboss.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
        at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)
        at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:77)
        ... 46 more
Caused by: org.jbpm.graph.def.DelegationException: Identity 'bannersCount' does not reference a MethodExpression instance, returned type: java.lang.String
        at org.jbpm.graph.def.GraphElement.raiseException(GraphElement.java:387)
        at org.jbpm.graph.def.GraphElement.raiseException(GraphElement.java:378)
        at org.jbpm.graph.node.Decision.execute(Decision.java:148)
        at org.jbpm.graph.def.Node.enter(Node.java:319)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173)
        at org.jbpm.graph.def.Node_$$_javassist_203.enter(Node_$$_javassist_203.java)
        at org.jbpm.graph.def.Transition.take(Transition.java:151)
        at org.jbpm.graph.def.Node.leave(Node.java:394)
        at org.jbpm.graph.def.Node.leave(Node.java:358)
        at org.jbpm.graph.def.Node.execute(Node.java:350)
        at org.jbpm.graph.def.Node.enter(Node.java:319)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173)
        at org.jbpm.graph.def.Node_$$_javassist_203.enter(Node_$$_javassist_203.java)
        at org.jbpm.graph.def.Transition.take(Transition.java:151)
        at org.jbpm.graph.def.Node.leave(Node.java:394)
        at org.jbpm.graph.def.Node.leave(Node.java:358)
        at org.jbpm.graph.def.Node.execute(Node.java:350)
        at org.jbpm.graph.def.Node.enter(Node.java:319)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173)
        at org.jbpm.graph.def.Node_$$_javassist_203.enter(Node_$$_javassist_203.java)
        at org.jbpm.graph.def.Transition.take(Transition.java:151)
        at org.jbpm.graph.def.Node.leave(Node.java:394)
        at org.jbpm.graph.def.Node.leave(Node.java:358)
        at org.jbpm.graph.def.Node.execute(Node.java:350)
        at org.jbpm.graph.def.Node.enter(Node.java:319)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173)
        at org.jbpm.graph.def.Node_$$_javassist_203.enter(Node_$$_javassist_203.java)
        at org.jbpm.graph.def.Transition.take(Transition.java:151)
        at org.jbpm.graph.def.Node.leave(Node.java:394)
        at org.jbpm.graph.def.Node.leave(Node.java:358)
        at org.jbpm.graph.def.Node.execute(Node.java:350)
        at org.jbpm.graph.def.Node.enter(Node.java:319)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173)
        at org.jbpm.graph.def.Node_$$_javassist_203.enter(Node_$$_javassist_203.java)
        at org.jbpm.graph.def.Transition.take(Transition.java:151)
        at org.jbpm.graph.def.Node.leave(Node.java:394)
        at org.jbpm.graph.node.StartState.leave(StartState.java:70)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173)
        at org.jbpm.graph.def.Node_$$_javassist_203.leave(Node_$$_javassist_203.java)
        at org.jbpm.graph.exe.Token.signal(Token.java:195)
        at org.jbpm.graph.exe.Token.signal(Token.java:140)
        at org.jbpm.graph.exe.ProcessInstance.signal(ProcessInstance.java:271)
        at org.jboss.seam.bpm.BusinessProcess.afterCreateProcess(BusinessProcess.java:147)
        at org.jboss.seam.bpm.BusinessProcess.createProcess(BusinessProcess.java:122)
        at org.jboss.seam.bpm.BusinessProcessInterceptor.afterInvocation(BusinessProcessInterceptor.java:106)
        at org.jboss.seam.bpm.BusinessProcessInterceptor.aroundInvoke(BusinessProcessInterceptor.java:49)
        at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
        at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
        at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
        at org.jboss.seam.persistence.EntityManagerProxyInterceptor.aroundInvoke(EntityManagerProxyInterceptor.java:26)
        at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
        at org.jboss.seam.persistence.HibernateSessionProxyInterceptor.aroundInvoke(HibernateSessionProxyInterceptor.java:27)
        at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
        at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
        at org.jboss.seam.intercept.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:50)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:118)
        at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
        at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
        at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
        at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:126)
        ... 85 more
Caused by: javax.el.ELException: Identity 'bannersCount' does not reference a MethodExpression instance, returned type: java.lang.String
        at org.jboss.el.parser.AstIdentifier.getMethodExpression(AstIdentifier.java:113)
        at org.jboss.el.parser.AstIdentifier.invoke(AstIdentifier.java:75)
        at org.jboss.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
        at org.jboss.seam.bpm.SeamExpressionEvaluator$1.evaluate(SeamExpressionEvaluator.java:97)
        at org.jboss.seam.bpm.SeamExpressionEvaluator.evaluate(SeamExpressionEvaluator.java:45)
        at org.jbpm.jpdl.el.impl.JbpmExpressionEvaluator.evaluate(JbpmExpressionEvaluator.java:39)
        at org.jbpm.jpdl.el.impl.JbpmExpressionEvaluator.evaluate(JbpmExpressionEvaluator.java:30)
        at org.jbpm.graph.node.Decision.execute(Decision.java:95)
        ... 173 more

[pmuir]

I think this is a bug, but I need to reproduce it to be sure. Can you file a JIRA issue?

[vanyatka]

https://jira.jboss.org/jira/browse/JBSEAM-3250

[luiggitama.luiggitama.gmail.com]

Hi all...

The bug specified in JBSEAM-3250 was fixed, but the patch is included in Seam 2.1.0 only. The patch should be applied to Seam 2.0.x as well.

See: JBSEAM-3432.

Regards,

Luis Tama

[mtorres]

The fix for this caused a regression. Please see JBSEAM-3355.

[karypid]

I want to use variables in a jBPM <mail-node/> and am affected by this. Does anybody know of a workaround that could be used to send a jBPM e-mail without static text only?