Hyland Connect

mprzycho · ‎08-22-2011

I tried to get properties of task from via:
http://localhost:8080/activiti-rest/service/form/{taskId}/properties

I got following exception:


WARNING: Exception or error caught in resource
java.lang.NullPointerException
        at org.codehaus.jackson.node.ObjectNode.toString(ObjectNode.java:344)
        at org.codehaus.jackson.node.ArrayNode.toString(ArrayNode.java:403)
        at org.codehaus.jackson.node.ObjectNode.toString(ObjectNode.java:344)
        at java.lang.String.valueOf(String.java:2826)
        at java.lang.StringBuilder.append(StringBuilder.java:115)
        at org.restlet.service.ConverterService.toRepresentation(ConverterService.java:213)
        at org.restlet.resource.UniformResource.toRepresentation(UniformResource.java:667)
        at org.restlet.resource.ServerResource.doHandle(ServerResource.java:464)
        at org.restlet.resource.ServerResource.get(ServerResource.java:645)
        at org.restlet.resource.ServerResource.doHandle(ServerResource.java:527)
        at org.restlet.resource.ServerResource.doNegotiatedHandle(ServerResource.java:587)
        at org.restlet.resource.ServerResource.doConditionalHandle(ServerResource.java:299)
        at org.restlet.resource.ServerResource.handle(ServerResource.java:846)
        at org.restlet.resource.Finder.handle(Finder.java:510)
        at org.restlet.routing.Filter.doHandle(Filter.java:156)
        at org.restlet.routing.Filter.handle(Filter.java:203)
        at org.restlet.routing.Router.doHandle(Router.java:497)
        at org.restlet.routing.Router.handle(Router.java:737)
        at org.restlet.routing.Filter.doHandle(Filter.java:156)
        at org.restlet.routing.Filter.handle(Filter.java:203)
        at org.restlet.routing.Filter.doHandle(Filter.java:156)
        at org.restlet.routing.Filter.handle(Filter.java:203)
        at org.restlet.routing.Filter.doHandle(Filter.java:156)
        at org.restlet.routing.Filter.handle(Filter.java:203)
        at org.restlet.routing.Filter.doHandle(Filter.java:156)
        at org.restlet.engine.application.StatusFilter.doHandle(StatusFilter.java:151)
        at org.restlet.routing.Filter.handle(Filter.java:203)
        at org.restlet.routing.Filter.doHandle(Filter.java:156)
        at org.restlet.routing.Filter.handle(Filter.java:203)
        at org.restlet.engine.ChainHelper.handle(ChainHelper.java:111)
        at org.restlet.engine.application.ApplicationHelper.handle(ApplicationHelper.java:72)
        at org.restlet.Application.handle(Application.java:388)
        at org.restlet.routing.Filter.doHandle(Filter.java:156)
        at org.restlet.routing.Filter.handle(Filter.java:203)
        at org.restlet.routing.Router.doHandle(Router.java:497)
        at org.restlet.routing.Router.handle(Router.java:737)
        at org.restlet.routing.Filter.doHandle(Filter.java:156)
        at org.restlet.routing.Filter.handle(Filter.java:203)
        at org.restlet.routing.Router.doHandle(Router.java:497)
        at org.restlet.routing.Router.handle(Router.java:737)
        at org.restlet.routing.Filter.doHandle(Filter.java:156)
        at org.restlet.routing.Filter.handle(Filter.java:203)
        at org.restlet.engine.ChainHelper.handle(ChainHelper.java:111)
        at org.restlet.Component.handle(Component.java:387)
        at org.restlet.Server.handle(Server.java:488)
        at org.restlet.engine.ServerHelper.handle(ServerHelper.java:71)
        at org.restlet.engine.http.HttpServerHelper.handle(HttpServerHelper.java:150)
        at org.restlet.ext.servlet.ServerServlet.service(ServerServlet.java:1037)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:279)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.jav
a:515)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:300)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
2011-08-22 08:39:33 org.restlet.engine.log.LogFilter afterHandle
INFO: 2011-08-22        08:39:33        127.0.0.1       michal  127.0.0.1       8080    GET     /act
iviti-rest/service/form/3920/properties -       500     486     0       31      http://localhost:808
0       curl/7.20.1 (i686-pc-cygwin) libcurl/7.20.1 OpenSSL/0.9.8r zlib/1.2.5 libidn/1.18 libssh2/1.
2.5     -
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

I tried on Tomcat 6.0.32, 6.0.33, 7.0.20 and the problem occurs.
Activiti 5.7.

Could you help me with that?
Thanks!

frederikherema1 · ‎08-24-2011

What properties does the task exactly have (keys + values) you were trying to get?

mprzycho · ‎08-24-2011

Process definition looks like that:



<?xml version="1.0" encoding="UTF-8"?>
<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" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/test">
  <process id="FormPropertiesTest" name="FormPropertiesTest">
    <documentation>Place documentation for the 'FormPropertiesTest' process here.</documentation>
    <startEvent id="startevent1" name="Start"></startEvent>
    <endEvent id="endevent1" name="End"></endEvent>
    <userTask id="usertask1" name="User Task" activiti:assignee="kermit" activiti:formKey="test.form">
      <extensionElements>


        <activiti:formProperty id="name" name="name" type="string" required="true" readable="true" writable="true"></activiti:formProperty>


      </extensionElements>
    </userTask>
    <sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="usertask1" targetRef="endevent1"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_FormPropertiesTest">
    <bpmndi:BPMNPlane bpmnElement="FormPropertiesTest" id="BPMNPlane_FormPropertiesTest">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35" width="35" x="110" y="180"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35" width="35" x="380" y="200"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
        <omgdc:Bounds height="55" width="105" x="211" y="160"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="145" y="197"></omgdi:waypoint>
        <omgdi:waypoint x="263" y="215"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="316" y="187"></omgdi:waypoint>
        <omgdi:waypoint x="380" y="217"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

and the problem occurs. When I did couple of changes it worked:

I had to add script before this task and initialize variable, e.g. nameVar.
then I set expression of this task to "${nameVar}".
Now the proper value was returned.


<?xml version="1.0" encoding="UTF-8"?>
<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" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/test">
  <process id="FormPropertiesTest" name="FormPropertiesTest">
    <documentation>Place documentation for the 'FormPropertiesTest' process here.</documentation>
    <startEvent id="startevent1" name="Start"></startEvent>
    <endEvent id="endevent1" name="End"></endEvent>
    <userTask id="usertask1" name="User Task" activiti:assignee="kermit" activiti:formKey="test.form">
      <extensionElements>

        <activiti:formProperty id="name" name="name" type="string" expression="${nameVar}" required="true" readable="true" writable="true"></activiti:formProperty>

      </extensionElements>
    </userTask>
    <sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="scripttask1"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="usertask1" targetRef="endevent1"></sequenceFlow>
    <scriptTask id="scripttask1" name="Script Task" scriptFormat="javascript">

      <script><![CDATA[execution.setVariable("nameVar", "")]]></script>

    </scriptTask>
    <sequenceFlow id="flow3" name="" sourceRef="scripttask1" targetRef="usertask1"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_FormPropertiesTest">
    <bpmndi:BPMNPlane bpmnElement="FormPropertiesTest" id="BPMNPlane_FormPropertiesTest">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35" width="35" x="110" y="180"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35" width="35" x="380" y="200"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
        <omgdc:Bounds height="55" width="105" x="211" y="160"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="scripttask1" id="BPMNShape_scripttask1">
        <omgdc:Bounds height="55" width="105" x="190" y="260"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="127" y="215"></omgdi:waypoint>
        <omgdi:waypoint x="190" y="287"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="316" y="187"></omgdi:waypoint>
        <omgdi:waypoint x="380" y="217"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow3" id="BPMNEdge_flow3">
        <omgdi:waypoint x="295" y="287"></omgdi:waypoint>
        <omgdi:waypoint x="263" y="215"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

Is it neccessary to both initialize variables (this way or by passing it through start step) and declare task formProperties to get this service done?

frederikherema1 · ‎08-24-2011

If you set the variable attr readable to "true", the variable SHOULD exist when the task props are fetched, it expect a variable with that name…

Hyland Connect

Problem with retrieving properties of task form via REST API