I have created a process, defined notification and reassignment under task1, as per below picture,：

When the process stayed at task1 over 10 seconds, it didn’t do the reassignment, and the notification did not work either. But in the database, there were new records created in the deadline and the notification_recipients table, refer to below picture:

The coding under the task server as followed：

  Use the human task handler:

The version of the JBPM is 5.3.0 Final

The details of the process definition file as followed: