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Activiti Border Timer Events

coner

Activiti 5.6, Eclipse Plugin

I have been having trouble creating border timer events successfully.

My model is a simple diagram with 2 service tasks, they only have System.out.println's inside of them.

I have been trying to setup the diagram such that the first event executes, and if it takes > 3 seconds to complete, the second task will also execute. Then the program will end.

Start -> Print Hello -> Exit
            Timer:LimitExceeded
            Print Slow Process -> Exit

this example is nearly identical to the one in the userguide except i am using PT4S instead of PT4H. I have been testing the timer by using Thread.sleep() in the first service task.

Also <property name="jobExecutorActivate" value="true" /> is in the activiti.cfg.xml file.

the error that appears is:

Jul 21, 2011 5:48:15 PM org.activiti.engine.impl.interceptor.CommandContext close
SEVERE: Error while closing command context
java.lang.NullPointerException
   at org.activiti.engine.impl.jobexecutor.TimerExecuteNestedActivityJobHandler.execute(TimerExecuteNestedActivityJobHandler.java:39)
   at org.activiti.engine.impl.persistence.entity.JobEntity.execute(JobEntity.java:78)
   at org.activiti.engine.impl.persistence.entity.TimerEntity.execute(TimerEntity.java:62)
   at org.activiti.engine.impl.cmd.ExecuteJobsCmd.execute(ExecuteJobsCmd.java:58)
   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.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
   at org.activiti.engine.impl.jobexecutor.ExecuteJobsRunnable.run(ExecuteJobsRunnable.java:36)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
   at java.lang.Thread.run(Unknown Source)
Exception in thread "pool-1-thread-6" java.lang.NullPointerException
   at org.activiti.engine.impl.jobexecutor.TimerExecuteNestedActivityJobHandler.execute(TimerExecuteNestedActivityJobHandler.java:39)
   at org.activiti.engine.impl.persistence.entity.JobEntity.execute(JobEntity.java:78)
   at org.activiti.engine.impl.persistence.entity.TimerEntity.execute(TimerEntity.java:62)
   at org.activiti.engine.impl.cmd.ExecuteJobsCmd.execute(ExecuteJobsCmd.java:58)
   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.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
   at org.activiti.engine.impl.jobexecutor.ExecuteJobsRunnable.run(ExecuteJobsRunnable.java:36)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
   at java.lang.Thread.run(Unknown Source)

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Comments

coner

so i've had to resort to using the following model to allow for timing:

start -> doWork -> sleep() -> exclusiveGate -> exit
^———————–|

where the exclusiveGate will always select the branch to go back to the doWork serviceTask.

mathiasd

Up !
I don't understand your solution. I'm having the same problem, I think I misunderstood the boundary timer event :

Start-event -> Script task containing a telnet request -> End-event

I put the following boundary event :

<boundaryEvent attachedToRef="telnetTask" cancelActivity="true" id="timer"><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <timerEventDefinition id="_theTimer"><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <timeDuration id="_theTimerDuration" xsi:type="tFormalExpression">PT1S</timeDuration><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </timerEventDefinition><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </boundaryEvent><br>

This boundary event is linked with a simple script task which print "Timeout", then it goes on an end-event.
My fake-telnet-server send a response 5 seconds after it receives the request, so the workflow should go in "Timeout" no ?

Instead of printing "Timeout", the workflow ends normally (after 5 seconds) then it prints :

GRAVE: Error while closing command context<br>java.lang.NullPointerException<br> at org.activiti.engine.impl.jobexecutor.TimerExecuteNestedActivityJobHandler.execute(TimerExecuteNestedActivityJobHandler.java:39)<br> at org.activiti.engine.impl.persistence.entity.JobEntity.execute(JobEntity.java:78)<br> at org.activiti.engine.impl.persistence.entity.TimerEntity.execute(TimerEntity.java:62)<br> at org.activiti.engine.impl.cmd.ExecuteJobsCmd.execute(ExecuteJobsCmd.java:58)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &hellip;<br>

What's wrong here ?

EDIT :

Actually now it writes "Timeout" after 1 second, but still got the nullPointerException. Plus, if I put a while(true); in my script, the timer doesn't work anymore (the flow gets stucked in the script task).

ronald_van_kuij

Wrong forum…

mathiasd

Could someone moves this subject to the right forum ?

mathiasd

Subject is now here : http://forums.activiti.org/en/viewtopic.php?f=6&t=2454