I'm getting an InvalidClassException when i read in an object, when i first open the object input stream. i.e. i have a class that i worte forever and a day ago, and i was saving files with one of these serialized in it, and then recently, i added an extractor to the class, and now when i even try to open an object input stream with one of these it gets mad and says java.io.InvalidClassException: my.class.name.here; local class incompatible: stream classdesc serialVersionUID = 13457817857854345, local classserialVersionUID = 23523513453453245 what can i do? i don't care about reading in this class, i just want the rest of the stuff to go through an object input stream. Any ideas?