Smallville Actor Going To Jail

Jones -- who recently pled guilty to conspiracy to sell more than 10,000 pills of Oxycodone -- was hit with the sentence this morning in federal court in Los Angeles.

Before sentencing, we're told Jones begged the judge for mercy ... explaining he'd lost everything -- including his dog, his car, and his acting gig on "Blue Mountain State" -- due to the drug charges.

The judge apparently bought it ... and said he was cutting the actor a break due to his "minor" role in the drug deal.