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GirlfriendEntity baby = new GirlfriendEntity (); java . lang . classNotFoundException : com . entity . GirlfriendEntity at java . base / jdk . internal . loader . Builtin classLoader . load class ( Builtin classLoader . java : 581 ) at java . base / jdk . internal . loader . classLoaders$App classLoader . load class ( classLoaders . java : 178 ) at java . base / java . lang . classLoader . load class ( classLoader . java : 522 ) at java . base / java . lang . class . forName0 ( Native Method ) at java . base / java . lang . class . forName ( class . java : 315 ) at Main . main ( Main . java : 6 )