title: What is "persistence exception translation" for @Repository beans
body: <p>I was reading Spring with annotation part and I came across <code>@Repository</code>annotation<br>
  I read that <code>@Repository</code> beans differ from <code>@Component</code> beans in the sense that they are eligible for persistence exception translation.</p>
  
  <p>Can somebody please elaborate what is meant by persistence exception translation?</p>