title: what is a serial version id?
body: <p>Duplicate <a href="https://stackoverflow.com/questions/285793/why-should-i-bother-about-serialversionuid">What is a serialVersionUID and why should I use it?</a></p>
  
  <p>Using Eclipse for some java work right now.  My class name is underlined in yellow.  I can either suppress the warning or just add the frickin serial id.</p>
  
  <p>I dont care either way (or should i?), but what exactly IS this serial id?</p>
  
  <p>thanks</p>