job.java.jackson.post-construct

@JsonDeserialize(converter=MyClassSanitizer.class)  // invoked after class is fully deserialized
    public class MyClass {
        public String field1;
    }

    import com.fasterxml.jackson.databind.util.StdConverter;
    public class MyClassSanitizer extends StdConverter<MyClass,MyClass> {
        @Override
        public MyClass convert(MyClass var1) {
            var.field1 = munge(var.field1);
            return var1;
        }
    }