A List of What Cannot JCache do

• JCache cannot save the order of insertion. You should use LinkedHashMap for that purposes.
• JCache cannot update whole entries in a cache atomically. You should use AtomicReference or some locking mechanisms for that purpose. (Ofcourse you can update a cache atomically if a cache has always only one reference.)
• JCache doesn't offer read-write lock. You should use ReadWriteLock for that purpose.
• JCache doesn't offer unmodifiable view of cache. You should use Collections.unmodifiableMap() for that purpose.