Spring Exception: BeanNotOfRequiredTypeException

Question

我有一个SpringMVC应用程序与Postgres DB。我尝试添加hibernate支持，但是不能创建DAO bean。

全部加

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'studentController' defined in file [C:UsersuserIdeaProjectssql-jdbc-school_apptargetsqlJdbcSchoolAppWEB-INFclassesuacomfoxmindedsqljdbcschoolcontrollersmenu_controllersStudentController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'hibernateStudentDao' is expected to be of type 'ua.com.foxminded.sqljdbcschool.dao.hibernate.HibernateStudentDao' but was actually of type 'jdk.proxy3.$Proxy64'
org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:578)
at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:530)
at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:170)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1161)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1010)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4948)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5256)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:698)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:696)
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1782)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:293)
at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:814)
at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:802)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:460)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:408)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:293)
at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:814)
at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:802)
at java.management/com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:472)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1472)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1310)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1412)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:360)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'hibernateStudentDao' is expected to be of type 'ua.com.foxminded.sqljdbcschool.dao.hibernate.HibernateStudentDao' but was actually of type 'jdk.proxy3.$Proxy64'

22-Dec-2022 12:50:37.840 SEVERE [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.loadOnStartup Servlet [dispatcher] in web application[]抛出load()异常org.springframework.beans.factory.BeanNotOfRequiredTypeException:名为'hibernateStudentDao'的Bean预计类型为'ua.com.foxminded. sqljdbcschool.da.hibernate.hibernatestudentdao '，但实际上类型为'jdk.proxy3.$Proxy64'

Spring Config for hibernate

@Configuration
@ComponentScan("ua.com.foxminded.sqljdbcschool")
@PropertySource("classpath:properties.properties")
@EnableTransactionManagement
public class SpringConfig {
private final Environment environment;
@Autowired
public SpringConfig(Environment environment) {
this.environment = environment;
}

@Bean
public DataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(Objects.requireNonNull(environment.getProperty("driver")));
dataSource.setUrl(environment.getProperty("url"));
dataSource.setUsername(environment.getProperty("user"));
dataSource.setPassword(environment.getProperty("password"));
return dataSource;
}
private Properties hibernateProperties() {
Properties properties = new Properties();
properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
return properties;
}
@Bean
public LocalSessionFactoryBean sessionFactory() {
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(dataSource());
sessionFactory.setPackagesToScan("ua.com.foxminded.sqljdbcschool.dto");
sessionFactory.setHibernateProperties(hibernateProperties());
return sessionFactory;
}
@Bean
public PlatformTransactionManager hibernateTransactionManager() {
HibernateTransactionManager transactionManager = new HibernateTransactionManager();
transactionManager.setSessionFactory(sessionFactory().getObject());
return transactionManager;
}
}

Dao类

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import ua.com.foxminded.sqljdbcschool.dao.StudentDao;
import ua.com.foxminded.sqljdbcschool.dto.CourseDTO;
import ua.com.foxminded.sqljdbcschool.dto.StudentDTO;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
@Repository
public class HibernateStudentDao implements StudentDao {
private final SessionFactory sessionFactory;
@Autowired
public HibernateStudentDao(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
@Override
@Transactional
public void create(StudentDTO student) {
Session session = sessionFactory.getCurrentSession();
session.persist(student);
}
@Override
@Transactional
public List<StudentDTO> getAll() {
Session session = sessionFactory.getCurrentSession();
return session.createQuery(" select s from StudentDTO s", StudentDTO.class).getResultList();
}
@Override
@Transactional
public StudentDTO searchById(Integer id) {
Session session = sessionFactory.getCurrentSession();
return session.get(StudentDTO.class, id);
}
@Override
@Transactional
public void delete(StudentDTO student) {
Session session = sessionFactory.getCurrentSession();
session.remove(student);
}

控制器

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import ua.com.foxminded.sqljdbcschool.dao.CourseDao;
import ua.com.foxminded.sqljdbcschool.dao.StudentDao;
import ua.com.foxminded.sqljdbcschool.dao.hibernate.HibernateCourseDao;
import ua.com.foxminded.sqljdbcschool.dao.hibernate.HibernateStudentDao;
import ua.com.foxminded.sqljdbcschool.dto.CourseDTO;
import ua.com.foxminded.sqljdbcschool.dto.StudentDTO;
import java.util.ArrayList;
import java.util.List;
@Controller
@RequestMapping("/menu/")
public class StudentController {
private static final String REDIRECT_MENU_SUCCESS = "redirect:success";
private final StudentDao studentDao;
private final CourseDao courseDao;
@Autowired
public StudentController(HibernateStudentDao studentDao, HibernateCourseDao courseDao) {
this.studentDao = studentDao;
this.courseDao = courseDao;
}

StudentDao接口

public interface StudentDao {
void create (StudentDTO student);
List<StudentDTO> getAll();
StudentDTO searchById(Integer id);
void delete (StudentDTO student);
void addStudentToGroup(StudentDTO student, Integer groupId);
void addStudentToCourse(StudentDTO student, CourseDTO course);
void deleteStudentFromCourse(StudentDTO student, CourseDTO course);
Map<Integer, Integer> searchGroupsByStudentCount(Integer studentCount);
void batchCreate(List<StudentDTO> students);
void batchAddStudentToGroup(List<StudentDTO> students);

我真不知道该怎么修。

Answer 1

@Repository注释标记接口，而不是实现。如果您想要自定义实现，您必须遵循一些预定义的步骤(包括所涉及组件的命名/位置/标记)，请参阅JPA文档。你可以从这篇文章开始。

Answer 2

Deinum的决定

添加参数proxyTargetClass = true解决了这个问题在SpringConfig中启用transactionmanagement注释

@EnableTransactionManagement(proxyTargetClass = true)

还可以将控制器构造函数中的参数从Impl更改为带有Qualifier

的接口。