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[FIXED] Persister kann nicht gefunden werden

  • byMark
  • October 6, 2022
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Ausgabe

Ich habe das folgende Problem, wenn ich versuche, die findCliente-Methode auszuführen. Ich habe die Klasse Cliente im Paketmodell und wenn ich den findCliente-Controller ausführe, erhalte ich diese Ausnahme hier. Ich weiß nicht, wo ich falsch liege, weil ich nicht viel Erfahrung mit JPA und Spring Suite habe. Kann mir jemand sagen, wie ich diese Ausnahme beheben kann?

Ausnahme

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();
}

App-Initialisierer

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();
    }

Kunde

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;
    }
}

Schnittstelle 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);
}

KundenServiceImpl

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);
    }

}

Lösung

Um dieses Problem zu lösen, haben Sie zwei Möglichkeiten. Sie können zwischen beiden wählen. 1- Sie müssen alle Entity-Klassen in Ihrer Hibernate-Konfigurationsdatei deklariert haben. Dazu müssen Sie Ihre Entitätsklassen speziell “Cliente” in der Datei hibernate.cfg.xml wie folgt hinzufügen:

<mapping class="entity.Client"/>

oder

2-eine andere Möglichkeit besteht darin, diese Entität wie folgt zur Sitzungskonfiguration hinzuzufügen:

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


Beantwortet von – mohsen_true


Antwort geprüft von – Pedro (FixError Volunteer)

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