title: Java: check symbolic link file existence
body: <p>We talk about java 1.6 here. Since symoblic link is not yet supported, how can examine the existence of them.</p>
  
  <p>1: tell wheather the link file itself exists (return true even if the link is broken)</p>
  
  <p>2: follow the link and tell wheather underlying file exists.</p>
  
  <p>Is there really no way to realize this except JNI?</p>