Question

通过POST将表单提交到 UserController

调用addUser方法但是在第二行

 userService.addEmployee(user);

发生了一个例外，堆栈跟踪是

org.springframework.web.util.NestedServletException：请求处理失败;嵌套异常是org.springframework.transaction.CannotCreateTransactionException：无法打开Hibernate Session进行事务处理;嵌套异常是java.lang.ClassCastException：org.hibernate.impl.SessionImpl无法强制转换为org.hibernate.engine.spi.SessionImplementor org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:894） org.springframework.web.servlet.FrameworkServlet.doPost（FrameworkServlet.java:789） javax.servlet.http.HttpServlet.service（HttpServlet.java:710） javax.servlet.http.HttpServlet.service（HttpServlet.java:803）

根本原因

com.example.model.User@7544ae20 2015年2月26日下午4:51:02 org.apache.catalina.core.StandardWrapperValve调用严重：servlet dispatcherServlet的Servlet.service（）引发了异常 java.lang.ClassCastException：org.hibernate.impl.SessionImpl无法强制转换为org.hibernate.engine.spi.SessionImplementor 在org.springframework.orm.hibernate4.HibernateTransactionManager.doBegin（HibernateTransactionManager.java:354） at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction（AbstractPlatformTransactionManager.java:371） at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary（TransactionAspectSupport.java:335）在org.springframework.transaction.interceptor.TransactionInterceptor.invoke（TransactionInterceptor.java:105）在org.springframework.aop.framework.ReflectiveMethodInvocation.proceed（ReflectiveMethodInvocation.java:172）在org.springframework.aop.framework.JdkDynamicAopProxy.invoke（JdkDynamicAopProxy.java:202）在com.sun.proxy。$ Proxy17.addEmployee（未知来源）在com.example.controler.UserController.addUser（UserController.java:33） 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.method.support.InvocableHandlerMethod.invoke（InvocableHandlerMethod.java:213）在org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest（InvocableHandlerMethod.java:126）在org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle（ServletInvocableHandlerMethod.java:96）在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod（RequestMappingHandlerAdapter.java:617）在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal（RequestMappingHandlerAdapter.java:578）在org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle（AbstractHandlerMethodAdapter.java:80）在org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:923）在org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:852）在org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:882）在org.springframework.web.servlet.FrameworkServlet.doPost（FrameworkServlet.java:789）在javax.servlet.http.HttpServlet.service（HttpServlet.java:710）在javax.servlet.http.HttpServlet.service（HttpServlet.java:803）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:290）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:230）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:175）在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:128）在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:104）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:109）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:261）在org.apache.coyote.http11.Http11Processor.process（Http11Processor.java:844）在org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process（Http11Protocol.java:581）在org.apache.tomcat.util.net.JIoEndpoint $ Worker.run（JIoEndpoint.java:447）在java.lang.Thread.run（Thread.java:744）

UserController中

@Controller
@RequestMapping("/users")
public class UserController {

@Autowired
UserService userService;

@RequestMapping(method = RequestMethod.GET, params = "new")
public String addUser(Model model) {
    model.addAttribute(new User());
    return "users/edit";
}

@RequestMapping(method = RequestMethod.POST)
public String addUser(User user, BindingResult bindingResult) {
    System.out.println(user);
    userService.addEmployee(user);
    System.out.println(user);
    return "redirect:/users/" + user.getEmpName();
}
}

UserServiceImpl

@Service("employeeService")
@Transactional(propagation = Propagation.SUPPORTS, readOnly = true)
public class UserServiceImpl implements UserService {

@Autowired
private UserDao userDao;

@Transactional(propagation = Propagation.REQUIRED, readOnly = false)
public void addEmployee(User employee) {
    userDao.addEmployee(employee);
}

public List<User> listEmployeess() {
    return userDao.listEmployeess();
}

public User getEmployee(int empid) {
    return userDao.getEmployee(empid);
}

public void deleteEmployee(User employee) {
    userDao.deleteEmployee(employee);
}

}

Spring配置文件是

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
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/mvc 
    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"
xmlns:tx="http://www.springframework.org/schema/tx">

<context:component-scan base-package="com.example" />

<bean
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix">
        <value>/WEB-INF/pages/</value>
    </property>
    <property name="suffix">
        <value>.jsp</value>
    </property>
</bean>

<mvc:resources mapping="/**" location="/resources/" />

<mvc:annotation-driven />

<context:property-placeholder location="classpath:resources/database.properties" />

<tx:annotation-driven transaction-manager="hibernateTransactionManager" />

<bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="${database.driver}" />
    <property name="url" value="${database.url}" />
    <property name="username" value="${database.user}" />
    <property name="password" value="${database.password}" />
</bean>
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="annotatedClasses">
        <list>
            <value>com.example.model.User</value>
        </list>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
        </props>
    </property>
</bean>

<bean id="hibernateTransactionManager"
    class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

DAO

 @Repository
 public class UserDaoImpl implements UserDao {

private SessionFactory sessionFactory;

@Autowired
public UserDaoImpl(SessionFactory sessionFactory) {
    this.sessionFactory = sessionFactory;
}

public void addEmployee(User employee) {
    sessionFactory.getCurrentSession().saveOrUpdate(employee);
}

@SuppressWarnings("unchecked")
public List<User> listEmployeess() {
    return (List<User>) sessionFactory.getCurrentSession()
            .createCriteria(User.class).list();
}

public User getEmployee(int empid) {
    return (User) sessionFactory.getCurrentSession().get(User.class, empid);
}

public void deleteEmployee(User employee) {
    sessionFactory
            .getCurrentSession()
            .createQuery(
                    "DELETE FROM Employee WHERE empid = "
                            + employee.getEmpId()).executeUpdate();
}

}

模型

@Entity
 @Table(name="User")
 public class User implements Serializable{

private static final long serialVersionUID = -723583058586873479L;

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name = "empid")
private Integer empId;

@Column(name="empname")
private String empName;

@Column(name="empaddress")
private String empAddress;

@Column(name="salary")
private Long salary;

@Column(name="empAge")
private Integer empAge;

public Integer getEmpId() {
    return empId;
}

public void setEmpId(Integer empId) {
    this.empId = empId;
}

public String getEmpName() {
    return empName;
}

public void setEmpName(String empName) {
    this.empName = empName;
}

public String getEmpAddress() {
    return empAddress;
}

public void setEmpAddress(String empAddress) {
    this.empAddress = empAddress;
}

public Long getSalary() {
    return salary;
}

public void setSalary(Long salary) {
    this.salary = salary;
}

public Integer getEmpAge() {
    return empAge;
}

public void setEmpAge(Integer empAge) {
    this.empAge = empAge;
}

}

为什么会出现这种异常。请解释一下。

提前致谢。

Answer 1

您使用的是哪个版本的Spring？

为什么来自不同套餐的HibernateTransactionManager和AnnotationSessionFactoryBean？

您可以使用相同的包装并尝试。

Answer 2

问题是<bean id="sessionFactory">中的Spring配置文件，它使用hibernate3而<bean id="hibernateTransactionManager"使用hibernate4。

更改为hibernate4新配置文件。

Spring配置文件是

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
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/mvc 
    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"
xmlns:tx="http://www.springframework.org/schema/tx">

<context:component-scan base-package="com.example" />

<bean
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix">
        <value>/WEB-INF/pages/</value>
    </property>
    <property name="suffix">
        <value>.jsp</value>
    </property>
</bean>

<mvc:resources mapping="/**" location="/resources/" />

<mvc:annotation-driven />

<bean id="propertyConfigurer"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
        <list>
            <value>/WEB-INF/properties/database.properties</value>
        </list>
    </property>
</bean>

<bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="${jdbc.driver}" />
    <property name="url" value="${jdbc.url}" />
    <property name="username" value="${jdbc.user}" />
    <property name="password" value="${jdbc.password}" />
</bean>

<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="packagesToScan" value="com.example.model" />
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
        </props>

    </property>
</bean>


<tx:annotation-driven transaction-manager="transactionManager" />

<bean id="transactionManager"
    class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

ClassCastException：org.hibernate.impl.SessionImpl无法强制转换为engine.spi.SessionImplementor

2 个答案: