无法定位持久性

Question

当我尝试做findclient方法时，我有以下问题。我在包模型中有client类，当我运行findclient控制器时，我在这里得到这个异常。我不知道我错在哪里，因为我对JPA和Spring Suite没有太多的技能。有人能告诉我如何修复这个异常吗?

异常

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: Unable to locate persister: it.myshop.orm.model.Cliente
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause
java.lang.IllegalArgumentException: Unable to locate persister: it.myshop.orm.model.Cliente
org.hibernate.internal.SessionImpl.find(SessionImpl.java:3416)
org.hibernate.internal.SessionImpl.find(SessionImpl.java:3357)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:362)
com.sun.proxy.$Proxy41.find(Unknown Source)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:311)
com.sun.proxy.$Proxy41.find(Unknown Source)
it.myshop.orm.impl.ClienteServiceImpl.getById(ClienteServiceImpl.java:23)
it.myshop.orm.controller.ClienteController.findCliente(ClienteController.java:37)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause
org.hibernate.UnknownEntityTypeException: Unable to locate persister: it.myshop.orm.model.Cliente
org.hibernate.metamodel.internal.MetamodelImpl.locateEntityPersister(MetamodelImpl.java:727)
org.hibernate.internal.SessionImpl.locateEntityPersister(SessionImpl.java:3019)
org.hibernate.internal.SessionImpl.access$1800(SessionImpl.java:201)
org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.<init>(SessionImpl.java:2715)
org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.<init>(SessionImpl.java:2698)
org.hibernate.internal.SessionImpl.byId(SessionImpl.java:1180)
org.hibernate.internal.SessionImpl.find(SessionImpl.java:3380)
org.hibernate.internal.SessionImpl.find(SessionImpl.java:3357)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:362)
com.sun.proxy.$Proxy41.find(Unknown Source)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:311)
com.sun.proxy.$Proxy41.find(Unknown Source)
it.myshop.orm.impl.ClienteServiceImpl.getById(ClienteServiceImpl.java:23)
it.myshop.orm.controller.ClienteController.findCliente(ClienteController.java:37)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

AppConfig

package it.myshop.orm.config;
import javax.sql.DataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.Database;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfig;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
import org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver;
import it.myshop.orm.dao.ClienteService;
import it.myshop.orm.impl.ClienteServiceImpl;
@EnableWebMvc
@Configuration
@ComponentScan("it.myshop.orm.controller")
public class AppConfig {


@Bean
public ViewResolver getViewResolver() {

InternalResourceViewResolver iwv = new InternalResourceViewResolver();
iwv.setPrefix("/WEB-INF/view/");
iwv.setSuffix(".jsp");
iwv.setViewClass(JstlView.class);

return iwv;
}

//BEAN CONNESSIONE AL DB
@Bean
public DataSource getDbConnection() {

DriverManagerDataSource ds = new DriverManagerDataSource();
ds.setDriverClassName("com.mysql.cj.jdbc.Driver");
ds.setUrl("jdbc:mysql://localhost:3306/corso-spring-ud?serverTimezone=CET");
ds.setUsername("root");

return ds;
}

@Bean
public LocalContainerEntityManagerFactoryBean getEntityManager() {
HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();
adapter.setDatabase(Database.MYSQL);
adapter.setGenerateDdl(true); 
LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
factory.setDataSource(getDbConnection());
factory.setJpaVendorAdapter(adapter); //passo adapter
factory.setPackagesToScan(getClass().getPackage().getName()); 
return factory;
}

@Bean
public ClienteService getClienteServiceImpl() {
return new ClienteServiceImpl();
}

应用程序初始化

package it.myshop.orm.config;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
import it.myshop.orm.config.AppConfig;
public class AppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
// TODO Auto-generated method stub
return null;
}
@Override
protected Class<?>[] getServletConfigClasses() {
// TODO Auto-generated method stub
return new Class<?>[] {AppConfig.class};
}
@Override
protected String[] getServletMappings() {
// TODO Auto-generated method stub
return new String[] {"/"};
}
}

ClienteController

package it.myshop.orm.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import it.myshop.orm.dao.ClienteService;
import it.myshop.orm.impl.ClienteServiceImpl;
import it.myshop.orm.model.Cliente;
@Controller
@RequestMapping("/cliente")
public class ClienteController {


@Autowired
private ClienteService cs;
@ResponseBody
@GetMapping("/add")
public String add() {

//      cs.add(null);
System.out.println("Sei nella pagina di aggiunta");

return null;
}



@ResponseBody
@GetMapping("/findCliente")
public String findCliente() {

Cliente c = cs.getById(1);
System.out.println("Sei nella pagina di find del Cliente");

return c.getNome() + " " + c.getCognome();
}

Cliente

package it.myshop.orm.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="cliente")
public class Cliente {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;

@Column
private String nome;
@Column
private String cognome;
@Column
private String codiceFiscale;
@Column
private String email;
@Column
private String telefono;
@Column
private String username;
@Column
private String password;

public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getNome() {
return nome;
}
public void setNome(String nome) {
this.nome = nome;
}
public String getCognome() {
return cognome;
}
public void setCognome(String cognome) {
this.cognome = cognome;
}
public String getCodiceFiscale() {
return codiceFiscale;
}
public void setCodiceFiscale(String codiceFiscale) {
this.codiceFiscale = codiceFiscale;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getTelefono() {
return telefono;
}
public void setTelefono(String telefono) {
this.telefono = telefono;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}

接口ClienteService

package it.myshop.orm.dao;
import it.myshop.orm.model.Cliente;
public interface ClienteService {
public Cliente add(Cliente c);

public Cliente getById(int id);
}

ClienteServiceImpl

package it.myshop.orm.impl;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import it.myshop.orm.dao.ClienteService;
import it.myshop.orm.model.Cliente;
public class ClienteServiceImpl implements ClienteService {

@PersistenceContext
public EntityManager em;

@Override
public Cliente add(Cliente c) {
em.persist(c);
return c;
}
@Override
public Cliente getById(int id) {
return em.find(Cliente.class, id);
}
}

Answer 1

为了解决这个问题，您有两个选择。你可以任选其一。你必须在hibernate配置文件中声明所有的实体类。为此，您必须添加实体类，特别是"客户端"。在hibernate.cfg.xml文件像这样:

<mapping class="entity.Client"/>

或

2-另一种方法是像这样将这个实体添加到会话配置中:

SessionFactory factory = new Configuration().configure("hibernate.cfg.xml") .addAnnotatedClass(Cliente.class) .buildSessionFactory();