org.hibernate.lazyInitializationException：无法初始化代理-没有会话？

Question

我试图从DB中的一个对象做一个简单的加载，但是我得到的错误是“Could not initialize proxy-no session”，有什么想法吗？谢谢

org.hibernate.LazyInitializationException: could not initialize proxy - no Session
    org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.jav a:167)
    org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:215)
    org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:190)
    com.myapp.domain.User_$$_javassist_0.getLogin(User_$$_javassist_0.java)
    com.myapp.validator.UserFormValidator.validate(UserFormValidator.java:34)

@Component 
public class UserFormValidator implements Validator {

@Autowired
private UserDAO userDAO;  

@Override
public boolean supports(Class<?> clazz) {
    return UserForm.class.equals(clazz);
}

public UserDAO getUserDAO() {
    return userDAO;
}

public void setUserDAO(UserDAO userDAO) {
    this.userDAO = userDAO;
}

@Override
public void validate(Object target, Errors errors) {
    User user = (User)getUserDAO().findById(new Integer(1));
    System.out.println ("User -> " + user.getLogin());
}
}

@Transactional
public class GenericDAOHibernateImpl <T, PK extends Serializable>
implements GenericDAO<T, PK> {

public GenericDAOHibernateImpl() {
    super();
}

private Class<T> type;

@Resource(name = "sessionFactory")
private SessionFactory sessionFactory;

public GenericDAOHibernateImpl(Class<T> type) {
    this.type = type;
}

public void saveOrUpdate(T object) {
    getSession().save(object);
}

public Object findById(Serializable id) {
     return getSession().load(type, id);
}

protected Session getSession() {
    return sessionFactory.getCurrentSession();
}
}

<?xml version="1.0" encoding="UTF-8"?>
<beans  xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
        ">

<context:property-placeholder location="/WEB-INF/jdbc.properties" />

<!-- Enable annotation style of managing transactions -->
<tx:annotation-driven transaction-manager="transactionManager" />   

<!-- Declare the Hibernate SessionFactory for retrieving Hibernate sessions -->
<!-- See http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/orm/hibernate3/annotation/AnnotationSessionFactoryBean.html -->                           
<!-- See http://docs.jboss.org/hibernate/stable/core/api/index.html?org/hibernate/SessionFactory.html -->
<!-- See http://docs.jboss.org/hibernate/stable/core/api/index.html?org/hibernate/Session.html -->

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"
             p:dataSource-ref="dataSource"
             p:configLocation="classpath:hibernate.cfg.xml"
             p:packagesToScan="com.myapp.domain"/>  

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" 
destroy-method="close" 
p:driverClass="${jdbc.driverClassName}" 
p:jdbcUrl="${jdbc.url}"
p:user="${jdbc.username}"
p:password="${jdbc.password}"
p:acquireIncrement="5"
            p:idleConnectionTestPeriod="60"
            p:maxPoolSize="100"
            p:maxStatements="50"
            p:minPoolSize="10" 
/>


<!-- Declare a transaction manager-->
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager" 
            p:sessionFactory-ref="sessionFactory" />

@Entity
@Table(name="USER")
public class User extends appEntity {

@Id
@Column(name = "USER_ID", unique = true, nullable = false)
private Integer id;
@Column(name = "LOGIN")
private String login;
@Column(name = "PASSWORD")
private String password;


public String getLogin() {
    return login;
}
public void setLogin(String login) {
    this.login = login;
}

public Integer getId() {
    return id;
}
public void setId(Integer id) {
    this.id = id;
}
public String getPassword() {
    return password;
}
public void setPassword(String password) {
    this.password = password;
}

Answer 1

尝试将@transactional添加到validate方法：

@Override
@Transactional(readOnly=true)
public void validate(Object target, Errors errors) {
    ...
}

因为没有@transactional注释，所以没有与该方法关联的会话，每个查询将在它自己的会话中运行，该会话随后立即关闭。

方法session.load()始终返回代理，这与session.get()不同（有关load与get之间的区别，请参阅此处）。

因此返回代理，但由于缺少@transactional，创建代理的会话立即关闭。当第一次访问代理时，它的会话被关闭，所以我们得到“no session”错误。

如果您从load()更改为get()，这只能部分解决问题，因为如果在get之后尝试加载（例如，惰性初始化集合），则会再次发生异常。

向业务方法中添加@transactional将确保在方法调用的持续时间内存在同一会话，并防止此错误和其他相关错误的发生。