我正在使用Spring 3和Hibernate 4
我有以下 class 结构
public interface GenericDAO<T> {
public void create(T entity);
public void update(T entity);
public void delete(T entity);
}
DAO类
public interface EmployeeDAO extends GenericDAO<Employee> {
public void findEmployee(EmployeeQueryData data);
}
DAO实现类
@Repository("employeeDAO")
public abstract class EmployeeDAOImpl implements EmployeeDAO {
protected EntityManager entityManager;
@Override
public void findEmployee(EmployeeQueryData data) {
...... code
}
我面临的问题是当我尝试部署时,出现以下异常。
如果我从
abstract
中删除EmployeeDAOImpl
并从extends GenericDAO<Employee>
中删除EmployeeDAO
,则应用程序将被正确部署。因此,不可能有abstract
的EmployeeDAOImpl
类,或者我需要在没有GenericDAO
的DAO实现中实现abstract
的所有方法?Error creating bean with
name 'employeeService': Injection of autowired dependencies failed; \
nested exception is org.springframework.beans.factory.BeanCreationException:
Could not autowire field: test.dao.EmployeeDAO
test.service.EmployeeServiceImpl.employeeDAO; nested exception is
org.springframework.beans.factory.NoSuchBeanDefinitionException:
No matching bean of type [test.dao.EmployeeDAO] found for dependency:
expected at least 1 bean which qualifies as autowire candidate for
this dependency. Dependency annotations:
{@javax.inject.Inject()}.
编辑1
通用DAOImpl
public class GenericDAOImpl<T> implements GenericDAO<T> {
public void create(T entity) {
}
public void update(T entity) {
}
public void delete(T entity) {
}
EmployeeDAOImpl
public class EmployeeDAOImpl extends GenericDAOImpl<Employee> implements EmployeeDAO {
最佳答案
Java(因此是Spring)无法创建抽象类的实例:每个方法都必须具有一个实现,然后Java才能让您创建实例,否则在尝试调用该方法时会出现运行时错误。您需要从EmployeeDAOImpl中删除“摘要”,并实现从GenericDAO继承的方法。
关于java - 自动连接的依赖项的注入(inject)对于抽象类失败,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/15269520/