title: h:selectOneMenu generic converter for all entities without calling DB again and again
body: <p>I want to get selected object from <code>&lt;h:selectOneMenu&gt;</code>, but the problem is I couldn't find any generic converter for all type of entities.</p>
  
  <p>My first question is, is there a generic converter for all type of entities? I don't want to write another converter again for each other entity. My second question is, is there a way to get selected object without any converter? I don't want to call the DB again and again.</p>
  
  <p>I have a <code>Car</code> entity with <code>id</code> and <code>name</code> properties.</p>