java - Transactions with Spring Cache Abstraction and JDBC DAO -

i'm testing out spring's @cacheable features ehcache can't find on whether works spring's @transactional annotations.

i placing @cacheable , @cacheevict on dao methods while @transactional on service methods.

suppose user dao looks this:

@cacheable(value="users", key="#id") user find(biginteger id);  @cacheevict(value="users", key="#user.id") void update(user user);  @cacheevict(value="users", key="#id") void delete(biginteger id); 

a problem may arise when, example, getuser() called while removefriend() in progress, because user stale friend count re-cached (or it?):

public user getuser(userid) {     return userdao.find(userid); }  @transactional public void removefriend(userid, friendid) {     frienddao.remove(friendid);     user.setfriendcount(--numfriends);     userdao.update(user);     // other stuff } 

how can ensure doesn't update cache before database transaction has completed? place @cacheevict on service methods in addition dao methods? or, add read/write locking service methods? , if locking, there libraries lock based on id since want lock on each user instead of locking globally, e.g. @guardedby("userlocks.getreadlock(#userid)")? there accepted way of handling caching , transactions?

many thanks!

i should've looked ehcache documentation bit more because answer here.

ehcache 2.4+ works spring's @transactional annotation. need configure transaction manager lookup.