title: PostgreSQL and Hibernate: Found: numeric, expected: int8
body: <p>I have table in PostgreSQL which contains column with type <code>numeric(20)</code>. </p>
  
  <p>I have mapped this column on field of type <code>Long</code>.</p>
  
  <p>While validation part hibernate gives me an exception, saying: <code>Found: numeric, expected: int8</code>. I can not change type of column in the database, how to solve it?</p>