title: hibernate populate table if empty
body: <p>I have an entity class and I want hibernate to populate the corresponding table in DB with some constant values: several rows with some data (if there is no values in it, or replace...) 
  How can I ask hibernate to do this (ideally with annotations)? </p>
  
  <p>I'm using hibernate 3.2 and spring 3.1. </p>
  
  <p>Thanks in advance!!! </p>