topic Re: activiti engine crashes when calling WS in Alfresco Archive

activiti engine crashes when calling WS

activiti_user11 — Thu, 06 Oct 2011 14:09:45 GMT

Hi, I haven't been able to deploy and run the cxf-example so I have made my own WS based on a simple example I found, and deploy it to a glassfish server in the 8181 port so it won't interfere with the activiti 8080 port. I have copied all the needed .jars into activiti-explorer and activiti-rest li

Re: activiti engine crashes when calling WS

trademak — Fri, 07 Oct 2011 08:25:02 GMT

Hi,

The Activiti Explorer crashes on the name attribute of the process definition. Could it be that you have deployed a process without a name attribute?
Maybe you can cleanup the Activiti database and deploy your WS process again?

Best regards,

Re: activiti engine crashes when calling WS

activiti_user11 — Fri, 07 Oct 2011 12:09:47 GMT

Hi, yes I've read about it and forgot to add the name to the process. But now when I invoke the WS the java.lang.NullPointerException is still raised by vaadin, I really dont know where is the problem now …
thank you very much !
regards, ANdrea

Re: activiti engine crashes when calling WS

trademak — Fri, 07 Oct 2011 12:22:37 GMT

I don't see where you map a process variable to the web service request message.
Is your process based on same kind of working example?
Maybe you could use the web service example of chapter 11 of the Activiti in Action book to get started?

Best regards,

Re: activiti engine crashes when calling WS

activiti_user11 — Fri, 07 Oct 2011 13:53:30 GMT

hi, I don't know where to get the chapter 11 of the Activiti book as it will be released by the end of February 2012. Any other tutorial to see how to map the process variables to the request and response messages of the WS ?

My WS is the very simple Echo WS of an example I've found, it receives a string and returns the same string plus the word "result", and it is external to the activiti engine running in a glassfish server in localhost:8181.

thanks a lot !
regards, Vero

Re: activiti engine crashes when calling WS

trademak — Fri, 07 Oct 2011 15:48:47 GMT

Hi,

You can purchase the MEAP version of the book and you can download a lot of chapters including chapter 11 rightaway.
Just click on the link in my signature.

Best regards,

Re: activiti engine crashes when calling WS

activiti_user11 — Sat, 08 Oct 2011 11:05:59 GMT

hi, so purchasing the book is the only way to learn how to get external WS working in activiti ?
regards, Vero

Re: activiti engine crashes when calling WS

ronald_van_kuij — Sat, 08 Oct 2011 11:34:02 GMT

No, you can also look at the examples in the source, look at the source itself, try debugging, look at the real logging instead of what you see in the ui etc…

But buying the book is a real addition to, believe me (and no, I do not have any financial involvement in it, just an honest opinion)

Re: activiti engine crashes when calling WS

activiti_user11 — Tue, 11 Oct 2011 10:32:50 GMT

yeah, I've been looking at the examples and my process is defined in the same way, but both the examples and my process don't work. I also look at the console every time an error appears, which is really often with activiti, but couldn't solve them. there is really little documentation and examples to follow, and I guess nobody is going to tell me how to make the WS work, unless I buy the book.
best regards,
Vero.

Re: activiti engine crashes when calling WS

frederikherema1 — Tue, 11 Oct 2011 11:22:32 GMT

and I guess nobody is going to tell me how to make the WS work, unless I buy the book.

Not really sure this is the way to get help on the forum. Have you tried debugging the code (like ronald said) and seeing where exactly the NullPointer is created (if I look t your screenshot, I suspect somewhere in ItemDefinition.createInstance). That's a good starting point at least…

Re: activiti engine crashes when calling WS

activiti_user11 — Tue, 11 Oct 2011 12:12:21 GMT

I'm sorry but I've been dealing with this for more than two weeks now and I'm still couldn't get the WS invocation running I've looked at the examples and build my project the same way but calling an external WS. And there is no ItemDefinition.createInstance in the bpmn20.xml from the cxf-examples, with or without data flow definition. Attached is one of the examples I am trying to follow and my own process.
regards, Vero

Re: activiti engine crashes when calling WS

ronald_van_kuij — Tue, 11 Oct 2011 12:27:11 GMT

Please provide unit tests. I doubt anyone can/will help working from screenshots of the xml of processdefinitions.

Re: activiti engine crashes when calling WS

activiti_user11 — Tue, 11 Oct 2011 12:34:52 GMT

I'm sorry but there are no unit tests in the examples only the bpmn20.xml files to call the WS. Maybe you can provide me with an example ?
regards, Vero

Re: activiti engine crashes when calling WS

activiti_user11 — Tue, 11 Oct 2011 12:43:19 GMT

Maybe I don't understand how activiti works, I assume that when I deploy a bpmn20.xml that has an invocation to a ws the engine navigates from one activity to another and if I put an input variable in a form and then I assign it as the corresponding parameter to invoke the WS the value should have been copied from one to another. Is this right ?
regards, Vero

Re: activiti engine crashes when calling WS

code_expert — Wed, 12 Oct 2011 06:35:21 GMT

Hi, I was getting exactly the same exception. But I managed to resolve this.

The culprit was line no 3 in below code. The name field was not provided in my bpmn20.xml
I modified my process Id and the exception disappeared
So happy to see my process on the Activiti explorer.
<process id="ConsumeSpectrumWebservice" name="ConsumeWS">

I think Activiti code needs to be modified to add Null pointer checks

class org.activiti.explorer.ui.process.ProcessDefinitionListQuery

protected ProcessDefinitionListItem createItem(ProcessDefinition processDefinition) {
    ProcessDefinitionListItem item = new ProcessDefinitionListItem();
    item.addItemProperty("id", new ObjectProperty<String>(processDefinition.getId()));
    item.addItemProperty("name", new ObjectProperty<String>(processDefinition.getName()));
    item.addItemProperty("key", new ObjectProperty<String>(processDefinition.getKey()));
    return item;
}

Re: activiti engine crashes when calling WS

activiti_user11 — Wed, 12 Oct 2011 10:28:40 GMT

hi, the error of the null pointer due to the no name of the process I was able to solve it, it is a ui checking problem, but now, I can deploy the process, I can see the model and I can start a process instance, and there is when I've got this other null pointer error.

This is the code of my bpmn20.xml, can anybody tell me what is wrong ? because I've read the user guide, and several posts about errors when defining and passing process variables from forms to WS, I've tried several ways defining the I/O and now with the simplistic approach, but no one seems to work.

<?xml version="1.0" encoding="UTF-8"?>
<definitions
id="definitions"
xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:activiti="http://activiti.org/bpmn"
xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
xmlnsmgdc="http://www.omg.org/spec/DD/20100524/DC"
xmlnsmgdi="http://www.omg.org/spec/DD/20100524/DI"
typeLanguage="http://www.w3.org/2001/XMLSchema"
targetNamespace="org.activiti.engine.impl.webservice"
xmlns:tns = "org.activiti.engine.impl.webservice"
xmlns:echo = "http://echo/">

<import importType="http://schemas.xmlsoap.org/wsdl/"
          location="http://localhost:8181/pruWS/Echo2Service?wsdl"
          namespace="http://echo/" />

<process id="helloworld" name="helloworld">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="usertaskInput" name="Get input message" activiti:assignee="kermit">
      <extensionElements>
        <activiti:formProperty id="input" name="Inputmessage" type="string" variable="input" required="true" readable="true" writable="true">
        </activiti:formProperty>
        </extensionElements>
    </userTask>

    <serviceTask id="webServiceTask" name="Call WS" implementation="##WebService" operationRef="tns:echoOperation">
        <dataInputAssociation>
        <sourceRef>input</sourceRef><!– name of an Activiti variable –>
        <targetRef>arg0</targetRef><!– name of an element of the input message –>
      </dataInputAssociation>
      <dataOutputAssociation>
       <sourceRef>return</sourceRef><!– name of an element of the output message –>
       <targetRef>output</targetRef><!– name of an Activiti variable –>
      </dataOutputAssociation>
    </serviceTask>

    <userTask id="usertask1" name="Show output message" activiti:assignee="kermit">
      <extensionElements>
        <activiti:formProperty id="output" name="Outputmessage" type="string" variable="output" required="false" readable="true" writable="false">

        </activiti:formProperty>
      </extensionElements>
    </userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="usertaskInput"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="usertaskInput" targetRef="webServiceTask"></sequenceFlow>
    <sequenceFlow id="flow3" name="" sourceRef="webServiceTask" targetRef="usertask1"></sequenceFlow>
    <sequenceFlow id="flow4" name="" sourceRef="usertask1" targetRef="endevent1"></sequenceFlow>
</process>

<itemDefinition id="input" structureRef="string" />
<itemDefinition id="arg0" structureRef="string" />
<itemDefinition id="return" structureRef="string" />
<itemDefinition id="output" structureRef="string" />

   <!– Interface: implementationRef = QName of WSDL Port Type –>
<interface name="Echo Interface" implementationRef = "echo:Echo2" >
    <!– Operation: implementationRef = QName of WSDL Operation –>
    <operation id="echoOperation" name="Echo Operation" implementationRef="echo:echo">
      <inMessageRef>tns:echo</inMessageRef>
      <outMessageRef>tns:echoResponse</outMessageRef>
    </operation>
</interface>

<message id="echo" itemRef="tns:echoItemRequest" />
<message id="echoResponse" itemRef="tns:echoItemResponse" />

<itemDefinition id="echoItemRequest" structureRef="tns:echo" /><!– QName of input element –>
<itemDefinition id="echoItemResponse" structureRef="tns:ecoResponse" /><!– QName of output element –>

<bpmndi:BPMNDiagram id="BPMNDiagram_helloworld">
    <bpmndi:BPMNPlane bpmnElement="helloworld" id="BPMNPlane_helloworld">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35" width="35" x="50" y="90"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertaskInput" id="BPMNShape_usertaskInput">
        <omgdc:Bounds height="55" width="105" x="130" y="80"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="webServiceTask" id="BPMNShape_webServiceTask">
        <omgdc:Bounds height="55" width="105" x="280" y="80"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
        <omgdc:Bounds height="55" width="105" x="430" y="80"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35" width="35" x="570" y="90"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="85" y="107"></omgdi:waypoint>
        <omgdi:waypoint x="130" y="107"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="235" y="107"></omgdi:waypoint>
        <omgdi:waypoint x="280" y="107"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow3" id="BPMNEdge_flow3">
        <omgdi:waypoint x="385" y="107"></omgdi:waypoint>
        <omgdi:waypoint x="430" y="107"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow4" id="BPMNEdge_flow4">
        <omgdi:waypoint x="535" y="107"></omgdi:waypoint>
        <omgdi:waypoint x="570" y="107"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
</bpmndi:BPMNDiagram>
</definitions>

and this is the WSDL:

<?xml version="1.0" encoding="UTF-8"?>
<!– Published by JAX-WS RI at http://jax-ws.dev.java.net. RI's version is JAX-WS RI 2.1.3.3-hudson-757-SNAPSHOT. –>
<!– Generated by JAX-WS RI at http://jax-ws.dev.java.net. RI's version is JAX-WS RI 2.1.3.3-hudson-757-SNAPSHOT. –>
<definitions xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://echo/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://schemas.xmlsoap.org/wsdl/" targetNamespace="http://echo/" name="Echo2Service">
<types>
<xsd:schema>
   <xs:schema xmlns:tns="http://echo/" xmlns:xs="http://www.w3.org/2001/XMLSchema" version="1.0" targetNamespace="http://echo/">
      <xs:element name="echo" type="tns:echo" />
    <xs:element name="echoResponse" type="tns:echoResponse" />
    <xs:complexType name="echo">
     <xs:sequence>
      <xs:element name="arg0" type="xs:string" minOccurs="0" />
     </xs:sequence>
    </xs:complexType>
    <xs:complexType name="echoResponse">
     <xs:sequence>
      <xs:element name="return" type="xs:string" minOccurs="0" />
     </xs:sequence>
    </xs:complexType>
   </xs:schema>
</xsd:schema>
</types>

<message name="echo">
<part name="parameters" element="tns:echo"/>
</message>

<message name="echoResponse">
<part name="parameters" element="tns:echoResponse"/>
</message>

<portType name="Echo2">
<operation name="echo">
   <input message="tns:echo"/>
   <output message="tns:echoResponse"/>
</operation>
</portType>

<binding name="Echo2PortBinding" type="tns:Echo2">
<soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="document"/>
<operation name="echo">
   <soapperation soapAction=""/>
   <input>
    <soap:body use="literal"/>
   </input>
   <output>
    <soap:body use="literal"/>
   </output>
</operation>
</binding>

<service name="Echo2Service">
<port name="Echo2Port" binding="tns:Echo2PortBinding">
   <soap:address location="http://localhost:8181/pruWS/Echo2Service'/>
</port>
</service>
</definitions>

and this is the error I get:

12-oct-2011 12:10:44 com.vaadin.Application terminalError
GRAVE: Terminal error:
com.vaadin.event.ListenerMethod$MethodException
Cause: com.vaadin.event.ListenerMethod$MethodException
Cause: java.lang.NullPointerException
        at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510)
        at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:164)
        at com.vaadin.ui.AbstractComponent.fireEvent(AbstractComponent.java:1193)
        at com.vaadin.ui.Button.fireClick(Button.java:539)
        at com.vaadin.ui.Button.changeVariables(Button.java:206)
        at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVar iableBurst(AbstractCommunicationManager.java:1299)
        at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVar iables(AbstractCommunicationManager.java:1219)
        at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.doHandleU idlRequest(AbstractCommunicationManager.java:735)
        at com.vaadin.terminal.gwt.server.CommunicationManager.handleUidlRequest(CommunicationManager.java:296)
        at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:501)
        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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:619)
Caused by: com.vaadin.event.ListenerMethod$MethodException
Cause: java.lang.NullPointerException
        at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510)
        at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:164)
        at com.vaadin.ui.AbstractComponent.fireEvent(AbstractComponent.java:1193)
        at org.activiti.explorer.ui.form.FormPropertiesForm.access$000(FormPropertiesForm.java:45)
        at org.activiti.explorer.ui.form.FormPropertiesForm$1.buttonClick(FormPropertiesForm.java:139)
        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 com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:490)
        … 22 more
Caused by: java.lang.NullPointerException
        at org.activiti.engine.impl.bpmn.data.ItemDefinition.createInstance(ItemDefinition.java:44)
        at org.activiti.engine.impl.bpmn.webservice.MessageDefinition.createInstance(MessageDefinition.java:35)
        at org.activiti.engine.impl.bpmn.behavior.WebServiceActivityBehavior.execute(WebServiceActivityBehavior.java:69)
        at org.activiti.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:40)
        at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:76)
        at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:481)
        at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyL
istenerStart.eventNotificationsCompleted(AtomicOperationTransitionNotifyListenerStart.java:48)
        at org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.exe cute(AbstractEventAtomicOperation.java:52)
        at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:76)
        at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:481)
        at org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.exe
cute(AbstractEventAtomicOperation.java:45)
        at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:76)
        at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:481)
        at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionCreateS cope.execute(AtomicOperationTransitionCreateScope.java:44)
        at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:76)
        at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:481)
        at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyL
istenerTake.execute(AtomicOperationTransitionNotifyListenerTake.java:61)
        at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:76)
        at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:481)
        at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionDestroy
Scope.execute(AtomicOperationTransitionDestroyScope.java:111)
        at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:76)
        at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:481)
        at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyL
istenerEnd.eventNotificationsCompleted(AtomicOperationTransitionNotifyListenerEnd.java:36)
        at org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.exe
cute(AbstractEventAtomicOperation.java:52)
        at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:76)
        at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:481)
        at org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.exe
cute(AbstractEventAtomicOperation.java:45)
        at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:76)
        at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:481)
        at org.activiti.engine.impl.persistence.entity.ExecutionEntity.take(ExecutionEntity.java:326)
        at org.activiti.engine.impl.bpmn.behavior.BpmnActivityBehavior.performOu
tgoingBehavior(BpmnActivityBehavior.java:92)
        at org.activiti.engine.impl.bpmn.behavior.BpmnActivityBehavior.performDe
faultOutgoingBehavior(BpmnActivityBehavior.java:49)
        at org.activiti.engine.impl.bpmn.behavior.FlowNodeActivityBehavior.leave(FlowNodeActivityBehavior.java:44)
        at org.activiti.engine.impl.bpmn.behavior.AbstractBpmnActivityBehavior.leave(AbstractBpmnActivityBehavior.java:37)
        at org.activiti.engine.impl.bpmn.behavior.UserTaskActivityBehavior.signal(UserTaskActivityBehavior.java:74)
        at org.activiti.engine.impl.persistence.entity.ExecutionEntity.signal(ExecutionEntity.java:309)
        at org.activiti.engine.impl.persistence.entity.TaskEntity.complete(TaskEntity.java:149)
        at org.activiti.engine.impl.cmd.SubmitTaskFormCmd.execute(SubmitTaskFormCmd.java:74)
        at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
        at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)
        at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:42)
        at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)
        at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:40)
        at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
        at org.activiti.engine.impl.FormServiceImpl.submitTaskFormData(FormServiceImpl.java:68)
        at org.activiti.explorer.ui.task.TaskDetailPanel$4.handleFormSubmit(TaskDetailPanel.java:306)
        at org.activiti.explorer.ui.form.FormPropertiesEventListener.componentEvent(FormPropertiesEventListener.java:39)
        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 com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:490)
        … 31 more

thanks.
regards, Vero

Re: activiti engine crashes when calling WS

activiti_user11 — Fri, 14 Oct 2011 10:54:03 GMT

Hi, I've managed to get the WS calling work, but I am not able to display the WS response. This is the new code for my activiti process, can anybody tell me if I am missing something ?

the WS response variable is assigned to the output process variable and I want to display the output variable value.

I have not found in the examples a user task showing a response variable, only accesing objects created but I do not want to create any objects to hold the variables values but to access them directly in the process execution.

<?xml version="1.0" encoding="UTF-8"?>
<definitions
id="definitions"
xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:activiti="http://activiti.org/bpmn"
xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
xmlnsmgdc="http://www.omg.org/spec/DD/20100524/DC"
xmlnsmgdi="http://www.omg.org/spec/DD/20100524/DI"
typeLanguage="http://www.w3.org/2001/XMLSchema"
targetNamespace="org.activiti.engine.impl.webservice"
xmlns:tns = "org.activiti.engine.impl.webservice"
xmlns:echo = "http://echo/">
<!–xmlns:tns = "org.activiti.enginge.impl.webservice"–>
<!– targetNamespace="org.activiti.enginge.impl.webservice" –>

<import importType="http://schemas.xmlsoap.org/wsdl/"
          location="http://localhost:8181/pruWS/Echo2Service?wsdl"
          namespace="http://echo/" />

<message id="echo" itemRef="tns:echoItemRequest" />
<message id="echoResponse" itemRef="tns:echoItemResponse" />

<itemDefinition id="echoItemRequest" structureRef="echo:echo" />
<itemDefinition id="echoItemResponse" structureRef="echo:echoResponse" />

<!– Interface: implementationRef = QName of WSDL Port Type –>
<interface name="Echo Interface" implementationRef = "echo:Echo2" >
    <!– Operation: implementationRef = QName of WSDL Operation –>
    <operation id="echoOperation" name="Echo Operation" implementationRef="echo:echo">
      <inMessageRef>tns:echo</inMessageRef>
      <outMessageRef>tns:echoResponse</outMessageRef>
    </operation>
</interface>

<itemDefinition id="input" structureRef="string" />
<itemDefinition id="arg0" structureRef="string" />
<itemDefinition id="return" structureRef="string" />
<itemDefinition id="output" structureRef="string" />

<process id="helloworld" name="helloworld">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="usertaskInput" name="Get input message" activiti:assignee="kermit">
      <extensionElements>
        <activiti:formProperty id="input" name="Input message" required="true" type="string"></activiti:formProperty>
      </extensionElements>
    </userTask>
    <serviceTask id="webServiceTask" name="Call WS" implementation="##WebService" operationRef="tns:echoOperation">

           <!– The BPMN 2.0 Meta Model requires an Input/Output Specification –>
            <ioSpecification>
                <dataInput itemSubjectRef="tns:echoItemRequest" id="dataInputOfServiceTask" />
                <dataOutput itemSubjectRef="tns:echoItemResponse" id="dataOutputOfServiceTask" />
                <inputSet>
                    <dataInputRefs>dataInputOfServiceTask</dataInputRefs>
                </inputSet>
                <outputSet>
                 <dataOutputRefs>dataOutputOfServiceTask</dataOutputRefs>
                </outputSet>
            </ioSpecification>
            <dataInputAssociation>
                <sourceRef>input</sourceRef>
                <targetRef>arg0</targetRef>
            </dataInputAssociation>
            <dataOutputAssociation>
                <sourceRef>return</sourceRef>
             <targetRef>output</targetRef>
            </dataOutputAssociation>
</serviceTask>

<!– Interface: implementationRef = QName of WSDL Port Type –>

    <userTask id="usertask1" name="Show output message" activiti:assignee="kermit">
   <documentation>
        Response received from WS copied to output: ${output} yes or no ?
      </documentation>
      <extensionElements>
     <activiti:formProperty id="output" name="Output message" type ="string" expression="${output}" writable="false"></activiti:formProperty>
      </extensionElements>
    </userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="usertaskInput"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="usertaskInput" targetRef="webServiceTask"></sequenceFlow>
    <sequenceFlow id="flow3" name="" sourceRef="webServiceTask" targetRef="usertask1"></sequenceFlow>
    <sequenceFlow id="flow4" name="" sourceRef="usertask1" targetRef="endevent1"></sequenceFlow>
</process>
</definitions>

thank you,
regards, Vero

Re: activiti engine crashes when calling WS

ct1 — Fri, 10 Feb 2012 17:49:30 GMT

I had a similar problem. The fix I found was unbelievably simple, but it may not work for you. Here is what I found.

The web service I was calling did not ruturn the variable named "return", instead it returned the variable named "_return".

Changing the "<itemDefinition id="return" structureRef="string" />
                to "<itemDefinition id="_return" structureRef="string" />

the changing the "<dataOutputAssociation>
                         <sourceRef>return</sourceRef>"
                    to "<dataOutputAssociation>
                         <sourceRef>_return</sourceRef>"

fixed the problem I had. Maybe it would be worth a try for you.

Thank you.