[jira] [Created] (BROOKLYN-383) REST api serialization of sensor value that is a Task can cause StackOveflowError

["Aled Sage (JIRA)" <ji...@apache.org>]

Aled Sage created BROOKLYN-383:
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             Summary: REST api serialization of sensor value that is a Task can cause StackOveflowError
                 Key: BROOKLYN-383
                 URL: https://issues.apache.org/jira/browse/BROOKLYN-383
             Project: Brooklyn
          Issue Type: Bug
            Reporter: Aled Sage
            Priority: Minor


In Brooklyn 0.10.0-SNAPSHOT...

If a sensor value is set to be the value of an uncompleted {{Task}}, and then that sensor value is retrieved over json, it causes problems!

For example, if it is an effector task, we can get the warning below (with 600K characters on that log line!):

{noformat}
2016-11-10 11:41:30,059 WARN  o.a.b.u.c.j.ErrorAndToStringUnknownTypeSerializer [qtp1382493-13]: Standard serialization not possible for class org.apache.brooklyn.util.core.task.DynamicSequentialTask (Task[sleepEffector]@dTJS4pKS)
com.fasterxml.jackson.databind.JsonMappingException: Infinite recursion (StackOverflowError) (through reference chain: 
...
{noformat}

For other simpler in-progress tasks, it tries to serialize everything reachable from the task (so we get 251K of serialized state!).

We should not try to serialize tasks. Instead, we should return a simpler json object that tells us it is a task, gives us the id, and the task's display name.



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