title: Do synthetic methods generated for private fields really incur performance penalty?
body: <p>In Eclipse, there is a optional warning when a private field is accessed from an inner class, saying that a synthetic accessor method will be generated and that performance may be improved by making the field package-private. </p>
  
  <p>Does this synthetic method really incur performance penalty? I thought that accessors are generally inlined at runtime, aren't they?</p>