WWE Star Jack Swagger -- Avoids Jail For DUI & Pot Arrest

WWE superstar Jack Swagger was found GUILTY of driving his car while half-baked -- but won't spend any more time behind bars, TMZ has learned.

We broke the story ... Jack -- real name Jacob Hager -- was pulled over for speeding near Biloxi, Mississippi back in February, but was then arrested on suspicion of DUI​ (not for alcohol) after cops say they found weed in his car.

Jack was charged with DUI, speeding and possession -- but pled not guilty.

Today in court, a judge found the WWE star GUILTY -- with a capital G -- for DUI and speeding. The possession charge had previously been dropped.

Jack was sentenced to 6 months unsupervised probation, fined $1,498 (including court costs) and ordered to participate in MASEP -- an alcohol / substance education class for first-time DUI offenders.