Attached a project that captures exceptions on a process (parent) and on subprocess launched on it.

All the exceptions launched at same level as process throwing it are correctly captured, but if exception has to get trough subprocess to parent process event is turn into a null variable.

From attached project:

call directly the subprocess:

curl -u rhpamAdmin:rhp4m4dm1n$ -X POST "http://localhost:8080/kie-server/services/rest/server/containers/dealwithexceptions/processes/com.DealWithExceptionSubProcess/instances" -H "accept: application/json" -H "content-type: application/json"

19:16:20,322 INFO [stdout] (default task-193) Exception in sub process
19:16:20,324 INFO [stdout] (default task-193) Exception caught in sup process java.lang.Exception: Error from subprocess

Call parent process, but throw exception directly:
curl -u rhpamAdmin:rhp4m4dm1n$ -X POST "http://localhost:8080/kie-server/services/rest/server/containers/dealwithexceptions/processes/com.DealWithException/instances" -H "accept: application/json" -H "content-type: application/json" -d "

"

19:16:43,495 INFO [stdout] (default task-194) launch exception on parent
19:16:43,497 INFO [stdout] (default task-194) Exception caught main process java.lang.Exception: Parent error

Call parent process which call subprocess (where exception is thrown):

curl -u rhpamAdmin:rhp4m4dm1n$ -X POST "http://localhost:8080/kie-server/services/rest/server/containers/dealwithexceptions/processes/com.DealWithException/instances" -H "accept: application/json" -H "content-type: application/json" -d "

"

19:16:58,994 INFO [stdout] (default task-194) Exception in sub process
19:16:58,997 INFO [stdout] (default task-194) Exception caught in sup process java.lang.Exception: Error from subprocess
19:16:59,010 INFO [stdout] (default task-194) Exception caught main process null

Looks like exception is not correctly propagated to parent.