ISPN-4424 Synchronize updating cache entry and making a copy
ISPN-4424 Synchronize updating cache entry and making a copy
- making the CacheEntry immutable is not enough, the whole CacheEntry hierarchy needs to be made immutable
- using clone is simpler that making the hierarchy immutable
ISPN-3743

Ignore some of the errors that can be thrown by a node while stopping:
IllegalStateException and NullPointerException.