Is Jury Duty mandatory towards Australian citizens?

Have you recieved a summons (letter) either from your municpality or another in which you’re selected to be a juror (If so, what is the process like?). You show up to the courts and assigned a number along with being asked about occupation, status, etc. but is the probability even that high on becoming part of the 12 jurors? Also, is it considered a criminal offense for failing to appear?