After a restart any timer can not be accessed using a stored handle. The reason for this is that each primary key (id) of every timer changes with every restart of jboss.

This is the default behaviour using the hsqldb as datasource. This behaviour conflicts with the ejb 3 specification in the timer service section (chapter 18).

"The container must implement a timer handle to be usable over the lifetime of the timer." This handle isn't usable although the timer still exists.