I'm trying to update like this but it is not working
PersistenceManager PM = PMF.get().getPersistenceManager();
String Previous=Cat.CategoryName.split("<Edit>")[0];
String Current=Cat.CategoryName.split("<Edit>")[1];
Category Cur=PM.getObjectById(Category.class,Previous);
Cur.CategoryName=Current;
PM.flush();
PM.close();
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