小编nic*_*ola的帖子

我正在尝试实现这样的通用DAO，以将其与X实体（ID，代码，描述）非常相似：

@Repository
public interface GenericDao<T> extends JpaRepository<T, Long> {

    T findByCode(String code);
    T findById(Long id);
}

我的实体之一是这样的：

@Getter
@Setter
@Entity
@Table(name = "TEST")
public class Test {...}

我有一个需要使用Dao的服务：

@Service
public class TestServiceImpl implements TestService {

    private GenericDao<Test> testDao;

    @Autowired
    public TestServiceImpl(GenericDao<Test> testDao) {
        this.testDao = testDao;
    }
}

当我使用SpringBoot启动我的应用程序时，该应用程序无法启动，并且错误是：

Caused by: org.springframework.beans.factory.BeanCreationException: Error     creating bean with name 'genericDao': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not an managed type: class java.lang.Object
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at …