I went to court for shoplifting, got 20 hours of community service... Please HELP???

I am a 20 year old college student with no priors, who was accused of consuming a 3 dollar bottle of juice in a supermarker. Police came and booked us for shoplifting. I went to court and got 20 hours of community service and have to pay for the 3 dollar bottle. Judge said don't get in trouble for 12 months and this whole incident will get expunged and it will be like it never happened. I was wondering if after the 12 months any of this incident will remain on my permanent record. Will this affect me once I graduate and begin applying for jobs. Let me know what you think. Thanks