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Asynchronous ServiceTask with 'no Exclusice' option executed more than once

Question asked by christopher1 on Oct 23, 2016
Latest reply on Oct 26, 2016 by christopher1
I have problem when use asynchronous service tasks with "no exclusice" option.
Some task are executed more than once (somtimes twice or triple).
Process defintion:
Start Event -> Parallel Gateway -> four parell service Tasks (No1..4) -> Parallel Gateway -> End Event
Result of sinle execute process in attached log file.
Every exeucte serice task is logged: serviceNo1..4.executed
And "initial.result"/"final.result"  is reading the process state.
initial - on start process
finall - after 10 sec (if process is still alive)

   public ProcessResult readProcessResult(String processId) {
      HistoricProcessInstance hs = historyService.createHistoricProcessInstanceQuery().processInstanceId(processId)
      Map<String, Object> variables = hs.getProcessVariables();

      ProcessResult result = new ProcessResult();
      result.setResultExec1((String) variables.get("ExecuteS1"));
      result.setResultExec2((String) variables.get("ExecuteS2"));
      result.setResultExec3((String) variables.get("ExecuteS3"));
      result.setResultExec4((String) variables.get("ExecuteS4"));

      return result;

Services code:

public class ServiceNo1Impl implements ServiceNo1 {

   private static final Logger LOG = LoggerFactory.getLogger(ServiceNo1Impl.class);

   public void execute(DelegateExecution execution) throws Exception {
      // do something…
      execution.setVariable("ExecuteS1", "OK");

Spring Boot Request code:

   @RequestMapping(value = "/postAppExcl", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
   public ProcessResult processUserApplicationExcl(@RequestBody JobApplication jobApplication)
         throws InterruptedException {

      Map<String, Object> vars = Collections.<String, Object> singletonMap("jobApplication", jobApplication);
      String executionId = null;

      // start Activiti process
      ProcessInstance process = runtimeService.startProcessInstanceByKey("myProcessJobAppExcl", vars);
      executionId = process.getProcessInstanceId();
      LOG.debug("myProcessJobApp: executionId=" + executionId);

      // read process result
      ProcessResult result = serviceResult.readProcessResult(executionId);
      LOG.debug("initial.result=" + result);

      // try 10 times (with 1sec wait between read state)(
      if (result.getDurationInMillis() == null) {
         for (int i = 1; i <= 10; i++) {
            result = serviceResult.readProcessResult(executionId);
            // LOG.debug(i + ". result=" + result);
            if (result.getDurationInMillis() != null) {
               LOG.debug("End process with executionId=" + executionId);
         if (result.getDurationInMillis() == null) {
            LOG.debug("Process executionId=" + executionId + " not completed… yet ");
      LOG.debug("final.result=" + result);

      return result;

I can attach example source projects, where all ServiceTaska executions are writen to output log.