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org.springframework.orm.jpa.JpaSystemException: Cannot instantiate abstract class or interface: : java.util.List; nested exception is org.hibernate.InstantiationException: Cannot instantiate abstract class or interface: : java.util.List	at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:333)