Revert "Avoid NPE."

This reverts commit 856450d2cd163e12b01572c9bab317d043aa6f82.
Revert "Shutdown Quartz scheduler initiliazed by Spring with 10 workers. This scheduler does not looks to be used by the application."

This reverts commit 225da42dca3943000f5a982a0450c7c6019a5e97.