SimplePool setPoolSize incorrectly updates internal fields

[sergebg]

Bug report

When new pool size is less then existing, setPoolSize() method breaks consistency.
This happens when CachingSessionFactory is constructed using the most "convenient" constructor CachingSessionFactory(SessionFactory<F> sessionFactory). In this case initial poolSize=Integer.MAX_VALUE. And so when later we are trying to setup some other value, the pool object becomes broken.

[artembilan]

Fixed via dba307a