Unable to attach a file using REST

[dan1]

Hi,

I have 5.11 installed. I'm only using the activiti-rest application. I'm using curl to deploy processes and start instances. However, I'm unable to attach a file to a user task. Here is the process definition:

<?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" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="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.cisco.com/hcs">
  <process id="AttachFileProcess" name="Attach File Process">
    <startEvent id="startevent1" name="Start" activiti:initiator="initiator"></startEvent>
    <endEvent id="endevent3" name="End"></endEvent>
    <serviceTask id="servicetask1" name="Process File" activiti:class="com.example.ProcessFile"></serviceTask>
    <sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
    <sequenceFlow id="flow14" name="" sourceRef="servicetask1" targetRef="endevent3"></sequenceFlow>
    <userTask id="usertask1" name="Attach File" activiti:assignee="${initiator}"></userTask>
    <sequenceFlow id="flow15" name="" sourceRef="usertask1" targetRef="servicetask1"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_AttachFileProcess">
    <bpmndi:BPMNPlane bpmnElement="AttachFileProcess" id="BPMNPlane_AttachFileProcess">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35" width="35" x="50" y="84"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent3" id="BPMNShape_endevent3">
        <omgdc:Bounds height="35" width="35" x="400" y="84"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="servicetask1" id="BPMNShape_servicetask1">
        <omgdc:Bounds height="55" width="105" x="260" y="74"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
        <omgdc:Bounds height="55" width="105" x="119" y="74"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="85" y="101"></omgdi:waypoint>
        <omgdi:waypoint x="119" y="101"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow14" id="BPMNEdge_flow14">
        <omgdi:waypoint x="365" y="101"></omgdi:waypoint>
        <omgdi:waypoint x="400" y="101"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow15" id="BPMNEdge_flow15">
        <omgdi:waypoint x="224" y="101"></omgdi:waypoint>
        <omgdi:waypoint x="260" y="101"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>
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Here are the process details. Note that the user task id is 809.

>  curl -u"admin:admin" http://localhost/activiti-rest/service/process-instance/805

{"processInstanceId":"805","businessKey":"attach-1","processDefinitionId":"AttachFileProcess:1:804","startTime":"2013-02-18T05:59:06EST","startActivityId":"startevent1","startUserId":"admin","completed":false,"tasks":[{"taskId":"809","taskDefinitionKey":"usertask1","taskName":"Attach File","owner":null,"assignee":"admin","startTime":"2013-02-18T05:59:06EST","completed":false}],"activities":[{"activityId":"startevent1","activityName":"Start","activityType":"startEvent","startTime":"2013-02-18T05:59:06EST","completed":true,"endTime":"2013-02-18T05:59:06EST","duration":15},{"activityId":"usertask1","activityName":"Attach File","activityType":"userTask","startTime":"2013-02-18T05:59:06EST","completed":false}],"variables":[{"variableName":"initiator","variableValue":"admin"}]}
‍‍‍‍‍

Here is the output from attempting to upload a file:

> curl -v -u"admin:admin" –upload-file /activiti/attachments/junk.txt -H "Content-Type: text/plain; charset=UTF-8" http://localhost/activiti-rest/service/task/809/attachment

* About to connect() to localhost port 80
*   Trying 127.0.0.1… connected
* Connected to localhost (127.0.0.1) port 80
* Server auth using Basic with user 'admin'
> PUT /activiti-rest/service/task/809/attachment HTTP/1.1
> Authorization: Basic YWRtaW46YWRtaW4=
> User-Agent: curl/7.15.5 (i386-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
> Host: localhost
> Accept: */*
> Content-Type: text/plain; charset=UTF-8
> Content-Length: 4
> Expect: 100-continue
> 
< HTTP/1.1 100 Continue
< HTTP/1.1 500 Internal Server Error
< Date: Mon, 18 Feb 2013 11:26:51 GMT
< Accept-Ranges: bytes
< Server:  
< Vary: Accept-Charset, Accept-Encoding, Accept-Language, Accept
< Content-Type: text/html;charset=UTF-8
< Content-Length: 486
< Connection: close
<html>
<head>
   <title>Status page</title>
</head>
<body style="font-family: sans-serif;">
<p style="font-size: 1.2em;font-weight: bold;margin: 1em 0px;">Internal Server Error</p>
<p>The server encountered an unexpected condition which prevented it from fulfilling the request</p>
<p>You can get technical details <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.1">here</a>.<br>
Please continue your visit at our <a href="/">home page</a>.
</p>
</body>
</html>
* Closing connection #0
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Here the logs from activiti:

Feb 18, 2013 6:26:51 AM org.restlet.resource.UniformResource doCatch
WARNING: Exception or error caught in resource
org.activiti.engine.ActivitiException: Unable to add new attachment to task 809
        at org.activiti.rest.api.task.TaskAttachmentAddResource.addAttachment(TaskAttachmentAddResource.java:58)
        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.restlet.resource.ServerResource.doHandle(ServerResource.java:449)
        at org.restlet.resource.ServerResource.put(ServerResource.java:1173)
        at org.restlet.resource.ServerResource.doHandle(ServerResource.java:524)
        at org.restlet.resource.ServerResource.doNegotiatedHandle(ServerResource.java:590)
        at org.restlet.resource.ServerResource.doConditionalHandle(ServerResource.java:302)
        at org.restlet.resource.ServerResource.handle(ServerResource.java:849)
        at org.restlet.resource.Finder.handle(Finder.java:513)
        at org.restlet.routing.Filter.doHandle(Filter.java:159)
        at org.restlet.routing.Filter.handle(Filter.java:206)
        at org.restlet.routing.Router.doHandle(Router.java:500)
        at org.restlet.routing.Router.handle(Router.java:740)
        at org.restlet.routing.Filter.doHandle(Filter.java:159)
        at org.restlet.routing.Filter.handle(Filter.java:206)
        at org.restlet.routing.Filter.doHandle(Filter.java:159)
        at org.restlet.routing.Filter.handle(Filter.java:206)
        at org.restlet.routing.Filter.doHandle(Filter.java:159)
        at org.restlet.routing.Filter.handle(Filter.java:206)
        at org.restlet.routing.Filter.doHandle(Filter.java:159)
        at org.restlet.engine.application.StatusFilter.doHandle(StatusFilter.java:155)
        at org.restlet.routing.Filter.handle(Filter.java:206)
        at org.restlet.routing.Filter.doHandle(Filter.java:159)
        at org.restlet.routing.Filter.handle(Filter.java:206)
        at org.restlet.engine.ChainHelper.handle(ChainHelper.java:114)
        at org.restlet.engine.application.ApplicationHelper.handle(ApplicationHelper.java:75)
        at org.restlet.Application.handle(Application.java:391)
        at org.restlet.routing.Filter.doHandle(Filter.java:159)
        at org.restlet.routing.Filter.handle(Filter.java:206)
        at org.restlet.routing.Router.doHandle(Router.java:500)
        at org.restlet.routing.Router.handle(Router.java:740)
        at org.restlet.routing.Filter.doHandle(Filter.java:159)
        at org.restlet.routing.Filter.handle(Filter.java:206)
        at org.restlet.routing.Router.doHandle(Router.java:500)
        at org.restlet.routing.Router.handle(Router.java:740)
        at org.restlet.routing.Filter.doHandle(Filter.java:159)
        at org.restlet.routing.Filter.handle(Filter.java:206)
        at org.restlet.engine.ChainHelper.handle(ChainHelper.java:114)
        at org.restlet.Component.handle(Component.java:391)
        at org.restlet.Server.handle(Server.java:491)
        at org.restlet.engine.ServerHelper.handle(ServerHelper.java:74)
        at org.restlet.engine.http.HttpServerHelper.handle(HttpServerHelper.java:153)
        at org.restlet.ext.servlet.ServerServlet.service(ServerServlet.java:1031)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at sun.reflect.GeneratedMethodAccessor151.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:273)
        at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:270)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
        at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:305)
        at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:298)
        at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:57)
        at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:189)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
        at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:308)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:279)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java: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)
Feb 18, 2013 6:26:51 AM org.restlet.engine.log.LogFilter afterHandle
INFO: 2013-02-18        06:26:51        127.0.0.1       admin   127.0.0.1       80      PUT     /activiti-rest/service/task/809/attachment      -       500     486     4       4       http://localhost        curl/7.15.5 (i386-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5       -
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Last note. I traced the code to some degree and check the DB to ensure that the task is not suspended.

Any clue as to what is wrong or how I might work around this?

Thanks,
Dan

[frederikherema1]

Unfortunately, the original exception is not used as cause, so it's not easy to see what's happening:


} catch(Exception e) {
      if(e instanceof ActivitiException) {
        throw (ActivitiException) e;
      }
      throw new ActivitiException("Unable to add new attachment to task " + taskId);
    }

Are you able to debug the activiti-server in org.activiti.rest.api.task.TaskAttachmentAddResource.addAttachment? This may show you the root cause and take it from there…

[dan1]

Thanks for the response. I ran the debugger and the exception came from RestletUpload parseRepresentation. It's expecting multipart/form-data. I modified the curl command and all is well!


> curl -u"admin:admin" –form upload=@/activiti/attachments/junk.txt -X PUT http://localhost/activiti-rest/service/task/809/attachment

{"id":"901","name":"junk.txt","description":"junk.txt","type":"text/plain","url":null}

Thanks,
Dan

[jbarrez]

Thanks for posting back. Curl is indeed a funny beast sometimes.

[chittaranjan168]

Could not able to start process, through RuntimeService instance. Showing

Called Application
Called Method
Before process start
————
java.lang.NullPointerException
at com.test.jp.resource.HelloWorldResource.printHelloWorld(HelloWorldResource.java:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

HelloWorldResource.java
________________________

*
*
*
*
  System.out.println("Before process start");
            try {
            
       System.out.println("———— ");
       someBean.doTransactionalStuff(true);
      
       //runtimeService.startProcessInstanceByKey("helloProcess");
       System.out.println("After process start");
      } catch (RuntimeException re) {
       re.printStackTrace();
      }
******
Some Bean

public class SomeBean {


private RuntimeService runtimeService;

@Transactional
public void doTransactionalStuff(boolean error){
  System.out.println("stsrt process>>>>>>>>>!!!!!");
 
  String str=runtimeService.startProcessInstanceByKey("helloProcess").getId();
 
    if(str!=null){
     System.out.println("Process Instance is null!!!");
      throw new UnsupportedOperationException("Rollback needed!!");
    }
  }

public void setRuntimeService(RuntimeService runtimeService) {
  this.runtimeService = runtimeService;
}

}

and bpmn20.xml file
<process id="helloProcess" name="Hello Process" isExecutable="true">
    <startEvent id="start" name="Start"></startEvent>
    <sequenceFlow id="flow1" sourceRef="start" targetRef="print"></sequenceFlow>
    <serviceTask id="print" name="Service Task" activiti:expression="#{someOtherBean.doSimpleStuff()}" ></serviceTask>
    <sequenceFlow id="flow2" sourceRef="print" targetRef="end"></sequenceFlow>
    <endEvent id="end" name="End"></endEvent>
  </process>

[chittaranjan168]

Please help me…..

[martin_grofcik]

Hi,

what is the issue is someBean null? From where do you obtain someBean?
Could you prepare jUnit test for it?
http://forums.activiti.org/content/sticky-how-write-unit-test

Regards
Martin