title: Spring data CrudRepository exists
body: <p>When I extend <code>CrudRepository</code> interface, I have <code>exists(ID)</code> method in my subinteface. I can write <code>findBy&lt;property&gt;</code> methods.</p>
  
  <p>Is it possible somehow to write <code>existBy&lt;property&gt;</code> method that will return <code>boolean</code>. Or to annotate it with <code>@Query(jpa query)</code> so it will return <code>boolean</code>.</p>
  
  <p>I know that I can do <code>select count(*)</code> and return <code>long</code>, but then I will have to do <code>!=0</code> check in my service layer.</p>