Not able to get variables for a process instance through Rest Remote API

[bryan.johnson]

While I can start (and abort) a process instance following the documentation, I am unable to get the variables for a process.

I started with code borrowed from:

droolsjbpm-integration/kie-remote/kie-services-client/src/test/java/org/kie/services/client/api/LiveServerTest.java at m…

While the first post request to create the process instance works. The 2nd get request fails

@Test
public void restAnonymousTaskInitiator3Test() throws Exception {
        ClientRequestFactory requestFactory;
        requestFactory = RestRequestHelper.createRequestFactory(
                "http://qepdv-app05.ams.int:8080/rest", userId, password,
                10 * 1000);
        // Create (start process) request
        String urlString = new URL(deploymentUrl, deploymentUrl.getPath()
                + "rest/runtime/" + deploymentId + "/process/evaluation/start")
                .toExternalForm();
        urlString = urlString + "?map_employee=mary";
        ClientRequest restRequest = requestFactory.createRequest(urlString);
        logger.debug(">> " + urlString);
        // Post, get response, check status response, and get info
        ClientResponse<?> responseObj = checkResponse(restRequest.post());
        JaxbProcessInstanceResponse processInstance = (JaxbProcessInstanceResponse) responseObj
                .getEntity(JaxbProcessInstanceResponse.class);
        long procInstId = processInstance.getId();
        urlString = new URL(deploymentUrl, deploymentUrl.getPath()
                + "rest/runtime/" + deploymentId + "/process/instance/"
                + procInstId + "/variables").toExternalForm();
        restRequest = requestFactory.createRequest(urlString);
        logger.debug(">> " + urlString);
        // Get, get response, check status response, and get info
        responseObj = checkResponse(restRequest.get());
        JaxbVariablesResponse response = (JaxbVariablesResponse) responseObj
                .getEntity(JaxbVariablesResponse.class);
        logger.debug("response obj >> " + response.toString());

    }

Here is the relevant part of the logging:

<exception>

    <status>NOT_FOUND</status>

    <url>http://qepdv-app05.ams.int:8080/kie-wb/rest/runtime/org.jbpm:Evaluation:1.0.2/process/instance/154/variables</url>

    <message>NotFoundException thrown with message 'Could not find resource for relative : /runtime/org.jbpm:Evaluation:1.0.2/process/instance/154/variables of full path: http://qepdv-app05.ams.int:8080/kie-wb/rest/runtime/org.jbpm:Evaluation:1.0.2/process/instance/154/variables'</message>

    <stackTrace>org.jboss.resteasy.spi.NotFoundException: Could not find resource for relative : /runtime/org.jbpm:Evaluation:1.0.2/process/instance/154/variables of full path: http://qepdv-app05.ams.int:8080/kie-wb/rest/runtime/org.jbpm:Evaluation:1.0.2/process/instance/154/variables

I think that I am using the variables process call correctly

[GET] /runtime/ {deploymentId} /process/instance/ {procInstId} /variables

• Gets the list of process variables in a process instance.
• Returns a JaxbVariablesResponse
• The procInstId component of the URL must conform to the following regex: [0-9]+

f I use the abort process call:

[POST] /runtime/ {deploymentId} /process/instance/ {procInstId+} /abort

• Aborts the process instance.
• Returns a JaxbGenericResponse indicating whether or not the operation has succeeded.
• The procInstId component of the URL must conform to the following regex: [0-9]+

It works fine.

Any suggestions as to what I am doing wrong?

Thanks in advance.

[bryan.johnson]

I have been able to get my hands on the variables  using  one of the Process calls "with variables"

[POST] /runtime/ {deploymentId} /withvars/process/instance/ {procInstId} /signal

• Signals a process instance and retrieves the list of variables associated it
• Returns a JaxbProcessInstanceWithVariablesResponse (see above)
• The processInstId component of the URL must conform to the following regex: [0-9]+
• This operation takes a signal and a event query parameter.
  • The signal parameter value is used as the name of the signal. This parameter is required.
  • The event parameter value is used as the value of the event. This value may use the number query parameter syntax described above.

Here is the code that does the trick for me

        urlString = new URL(deploymentUrl, deploymentUrl.getPath()
                + "rest/runtime/" + deploymentId
                + "/withvars/process/instance/" + procInstId + "/signal")
                .toExternalForm();
        urlString = urlString + "?signal=boo";
        restRequest = requestFactory.createRequest(urlString);
        logger.debug(">> " + urlString);

        responseObj = checkResponse(restRequest.post());
        JaxbProcessInstanceWithVariablesResponse response;
        response = (JaxbProcessInstanceWithVariablesResponse) responseObj
                    .getEntity(JaxbProcessInstanceWithVariablesResponse.class);
        logger.debug("response obj >> " + response.toString());

While I can get on, I would still like to know what I am doing wrong with the rest call:

[GET] /runtime/ {deploymentId} /process/instance/ {procInstId} /variables

Tthanks in advance

[marco.rietveld]

Hi James,

Great work!

Unfortunately, the tests you're looking at, are for the 6.1.0-SNAPSHOT (and on the 6.0.x branch, for the 6.0.3-SNAPSHOT). I expect that you're probably using the 6.0.1.Final release? That release doesn't support the URL you reference:

[GET] /runtime/ {deploymentId} /process/instance/ {procInstId} /variables

[githikashree]

Hi Team,

Is there any workaround to get process variable through Remote API in 6.0.1-Final version of JBPM?

Thanks,

Ramabathiran K

[jmiguel77]

I am using bpms 6.0.1.GA; when i invoke this url:

http://150.88.1.121:8080/business-central/rest/runtime/com.ec.mutualistapichincha:bpm-listas-negras:1.0.0/process/instance/577/variables

the server return this anwer

<variables><status>SUCCESS</status><url>/business-central/rest/runtime/com.ec.mutualistapichincha:bpm-listas-negras:1.0.0/process/instance/577/variables</url><variables/></variables>

which is completely useless, i need the value of the variables in the process, but this is giving me the same information i am sending

is this a bug ? is there any way to retrieve the process variables using any other method ?

i also cannot find a way to retrieve the process variables using the kie-services-client API

[samboy_05]

Same problem , I am not able to access process variables , when hitting the REST url , I am getting status = 401 , Authentication error . I am sure that my authentication params are OK.

I have even tried the command based approach .

Command gvc = null;
      gvc= new FindVariableInstancesCommand(pi.getId(), name);
      Object returnobj = null;
      try{
         returnobj=execute(gvc);
      }catch(Exception e){
         log.error(e);
      }

public Object execute(Command<?> command){
     CommandBasedStatefulKnowledgeSession session = (CommandBasedStatefulKnowledgeSession)ksession;
     return session.execute(command);
  }

This fails with a silent Null Pointer Exception .

Setting a process variable works this way .. when using SetProcessInstanceVariablesCommand .

krisverlaenen can you help?