Question

我正在使用Spring与hibernate新手，我按照一步一步的教程，但我得到这个会话错误，但不知道如何解决它，任何人都可以帮助我吗？非常感谢你。我写的一个contintuacion通过我写的代码给出了错误。

Grave：El Servlet.service（）para el servlet [springapp] en el contexto con ruta [/ springapp]lanzólaexperticci[请求处理失败;嵌套异常是org.hibernate.HibernateException：找不到当前线程的会话] concausaraíz org.hibernate.HibernateException：找不到当前线程的Session 在org.springframework.orm.hibernate4.SpringSessionContext.currentSession（SpringSessionContext.java:97）在org.hibernate.internal.SessionFactoryImpl.getCurrentSession（SessionFactoryImpl.java:978）在com.altobri.conta.dao.EmpresasDAOImpl.listEmpresas（EmpresasDAOImpl.java:43）在com.altobri.conta.service.EmpresasServiceImpl.listEmpresas（EmpresasServiceImpl.java:47）在com.altobri.conta.controller.empresaListaController.list（empresaListaController.java:30） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method） at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:57） at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43） at java.lang.reflect.Method.invoke（Method.java:606）在org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod（HandlerMethodInvoker.java:176）在org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod（AnnotationMethodHandlerAdapter.java:440）在org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle（AnnotationMethodHandlerAdapter.java:428）在org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:925）在org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:856）在org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:936）在org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:827）在javax.servlet.http.HttpServlet.service（HttpServlet.java:621）在org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:812）在javax.servlet.http.HttpServlet.service（HttpServlet.java:728）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:305）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:51）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:243）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:222）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:123）在org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:502） at org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:171） at org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:100）在org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:953）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:118）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:408）在org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1041） at org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:603） at org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:312）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1145） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:615）在java.lang.Thread.run（Thread.java:744）

的web.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 id="WebApp_ID" version="2.5">
 <display-name>Spring3MVC</display-name>
 <welcome-file-list>
     <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>

 <servlet>

springapp-servlet.xml中

<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:p="http://www.springframework.org/schema/p"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="
   http://www.springframework.org/schema/beans     
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

   <context:component-scan base-package="com.companyname.springapp.web" />
   <context:component-scan base-package="com.springHibernate" />
   <context:component-scan base-package="com.altobri.conta.*" />

 <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>


     <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/empresas" />
    <property name="username" value="root" />
    <property name="password" value="" />
  </bean>

  <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
     <property name="annotatedClasses">
            <list>
                <value>com.altobri.conta.model.Empresas</value>
            </list>
        </property>
    <property name="hibernateProperties">
      <props>
        <prop 
         key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
        <prop key="hibernate.show_sql">true</prop>
      </props>
    </property>
  </bean>

    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager" 
    p:sessionFactory-ref="sessionFactory">
  </bean>
</beans>



 <servlet-name>springapp</servlet-name>
    <servlet-class>
        org.springframework.web.servlet.DispatcherServlet
    </servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>springapp</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

empresaListaController.java

package com.altobri.conta.controller;

import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.servlet.ModelAndView;

import com.altobri.conta.model.Empresas;
import com.altobri.conta.service.*;

@Controller
public class empresaListaController {

    @Autowired
    private EmpresasService empresasService;
    protected final Logger logger = Logger.getLogger(getClass());


    @RequestMapping("/empresaLista")
    // @RequestMapping(method = RequestMethod.GET)
    public String list(Model model) {

      List<Empresas> empresas = empresasService.listEmpresas();
      model.addAttribute("empresalist", empresas);
      return "empresaLista";
    }
}

EmpresasDAO

package com.altobri.conta.dao;

import com.altobri.conta.model.Empresas;
import java.util.List;

public interface EmpresasDAO {
    void persistEmpresas(Empresas empresas);

    Empresas findEmpresasById(int clave);

    void updateEmpresas(Empresas empresas);

    void deleteEmpresas(Empresas empresas);

    public List<Empresas> listEmpresas();

}

EmpresasDAOImpl.java

package com.altobri.conta.dao;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.altobri.conta.model.Empresas;

@Repository("empresasDAO")
public class EmpresasDAOImpl implements EmpresasDAO {

    @Autowired
    public SessionFactory sessionFactory;

    @Override
    public void persistEmpresas(Empresas empresas) {
        sessionFactory.getCurrentSession().persist(empresas);
    }

    @Override
    public Empresas findEmpresasById(int clave) {
        return (Empresas) sessionFactory.getCurrentSession().get(
                Empresas.class, clave);
    }

    @Override
    public void updateEmpresas(Empresas empresas) {
        sessionFactory.getCurrentSession().update(empresas);

    }

    @Override
    public void deleteEmpresas(Empresas empresas) {
        sessionFactory.getCurrentSession().delete(empresas);

    }

    @Override
    public List<Empresas> listEmpresas() {
        Session session = sessionFactory.getCurrentSession();
        List empresas = session.createQuery("from Empresas").list();
        // TODO Auto-generated method stub
         return empresas;
    }

}

Empresas.java

package com.altobri.conta.model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "EMPRESAS")
public class Empresas {

    @Id
    @Column(name = "CLAVE", nullable = false)
    private int clave;

    @Column(name = "NOMBRE", nullable = false)
    private String nombre;


    public Empresas() {


    }


    public int getClave() {
        return clave;
    }


    public void setClave(int clave) {
        this.clave = clave;
    }


    public String getNombre() {
        return nombre;
    }


    public void setNombre(String nombre) {
        this.nombre = nombre;
    }



}

EmpresasService.java

package com.altobri.conta.service;



import java.util.List;

import com.altobri.conta.model.Empresas;

public interface EmpresasService {

    void persistEmpresas(Empresas empresas);

    Empresas findEmpresasById(int clave);

    void updateEmpresas(Empresas empresas);

    void deleteEmpresas(Empresas empresas);

    public List<Empresas> listEmpresas();
}

EmpresasServiceImpl.java

package com.altobri.conta.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.altobri.conta.dao.EmpresasDAO;
import com.altobri.conta.model.Empresas;

@Service("empresasService")
public class EmpresasServiceImpl implements EmpresasService{

    @Autowired
    EmpresasDAO empresasDAO;

    @Override
    @Transactional
    public void persistEmpresas(Empresas empresas) {
        empresasDAO.persistEmpresas(empresas);

    }

    @Override
    @Transactional
    public void updateEmpresas(Empresas empresas) {
        empresasDAO.updateEmpresas(empresas);

    }
    @Override
    @Transactional
    public Empresas findEmpresasById(int clave) {
        return empresasDAO.findEmpresasById(clave);
    }

    @Override
    @Transactional
    public void deleteEmpresas(Empresas empresas) {
        empresasDAO.deleteEmpresas(empresas);

    }

    @Override
    public List<Empresas> listEmpresas() {
        // TODO Auto-generated method stub
        return empresasDAO.listEmpresas();
    }

}

Answer 1

您需要更新springapp-servlet.xml中的值

下

<property name="hibernateProperties">

对会话上下文使用以下值。

<prop key="hibernate.current_session_context_class">thread</prop>

线程是org.hibernate.context.internal.ThreadLocalSessionContext

的缩写

请查看此链接以获取更多详细信息。

http://docs.jboss.org/hibernate/orm/4.1/manual/en-US/html_single/#architecture-current-session

Answer 2

我还有另一种方法让它发挥作用。

在spring xml中包含<tx:annotation-driven/>。
在Service方法中添加Transactional注释（getCurrentSession（）需要在事务范围内。）：
```
@Transactional
public List<Empresas> listEmpresas(){
return empresasDAO.listEmpresas();}
```
删除<prop key="hibernate.current_session_context_class">thread</prop>

我认为这种方式更好，因为当会话已经存在时，不应该使用openSession方法。

Estado HTTP 500 - 请求处理失败;嵌套异常是org.hibernate.HibernateException：找不到当前线程的Session

2 个答案: