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The JPA repository offers an alternative method for returning custom objects called JPQL Constructor Expression. This method can be used to create a Bean class for specified fields or aggregated fields, such as grouping authors by age and finding the count of authors at each age. When implementing JPQL Constructor Expression, ensure to use the fully qualified name of the Bean or POJO class, use the "new" keyword before the constructor call, and pass arguments in the same order and type as in the constructor. This approach only works with non-native (JPQL) queries.