[英]Spring + Hibernate: No Hibernate Session bound to thread
[英]Spring + Hibernate with annotations: No Hibernate Session bound to thread
我是Spring的新手,我正在尝试使用以下堆栈创建一个webapp:Apache Tomcat 7,MySQL,Spring MVC,带有JPA注释的Hibernate 3。
我正试图通过遵循Craig Walls的“Spring in Action,第三版”一书来学习。
首先,我想创建一个页面,显示我手动添加到我的数据库中的一些条目,但看起来我的应用程序无法从SessionFactory创建/检索任何Hibernate会话。 这是我的根本原因堆栈跟踪:
exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.HibernateException: No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause
org.hibernate.HibernateException: No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here
org.springframework.orm.hibernate3.SpringSessionContext.currentSession(SpringSessionContext.java:63)
org.hibernate.impl.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:687)
com.nbarraille.www.dao.HibernateContactDAO.listContact(HibernateContactDAO.java:27)
com.nbarraille.www.controllers.HomeController.showHomePage(HomeController.java:24)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:613)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
这是我关心的Classes / Config文件:
我的HibernateDAO:
@Repository
public class HibernateContactDAO implements ContactDAO {
private SessionFactory sessionFactory;
@Autowired
public HibernateContactDAO(SessionFactory sessionFactory){
this.sessionFactory = sessionFactory;
}
public void addContact(Contact contact) {
sessionFactory.getCurrentSession().save(contact);
}
public List<Contact> listContact() {
@SuppressWarnings("unchecked")
List<Contact> cl = sessionFactory.getCurrentSession().createQuery("from Contact").list();
return cl;
}
public void removeContact(Integer id) {
Contact contact = (Contact) sessionFactory.getCurrentSession().load(Contact.class, id);
if (null != contact) {
sessionFactory.getCurrentSession().delete(contact);
}
}
}
我的联系课程:
@Entity
@Table(name="contacts")
public class Contact implements Serializable {
private static final long serialVersionUID = -5389913432051078273L;
@Id
@Column(name="id")
@GeneratedValue
private int id;
@Column(name="first_name")
private String firstname;
@Column(name="last_name")
private String lastname;
@Column(name="email")
private String email;
@Column(name="telephone")
private String telephone;
// Setters/Getters
}
我的控制器类:
@Controller
public class HomeController {
private ContactDAO contactDAO; // I know I should pass through a service instead of accessing my DAO directly, and I usually do, but I skipped it here to simplify and try to locate the problem
@Inject
public HomeController(ContactDAO contactDAO){
this.contactDAO = contactDAO;
}
@RequestMapping({"/", "/home"})
public String showHomePage(Map<String,Object> model){
model.put("contacts", contactDAO.listContact());
return "index";
}
}
这是我的Context Data Config文件:
<bean id="DBpropertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="/WEB-INF/jdbc.properties" />
</bean>
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/nbarraille" />
<property name="username" value="root" />
<property name="password" value="password" />
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.nbarraille.www.core" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<!-- Adds an advisor to any bean annotated with @Repository so that any platform-specific exception
are caught and then rethrown as one of Spring's unchecked data access exceptions -->
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
这是我的Dispatcher Servlet配置:
<mvc:resources mapping="/resources/**"
location="/resources/" />
<mvc:annotation-driven />
<context:component-scan base-package="com.nbarraille.www" />
<bean class="org.springframework.web.servlet.view.tiles2.TilesViewResolver" />
<bean class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">
<property name="definitions">
<list>
<value>/WEB-INF/tiles-def.xml</value>
</list>
</property>
</bean>
<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="classpath:messages" />
<property name="defaultEncoding" value="UTF-8"/>
</bean>
<bean id="localeChangeInterceptor"
class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
<property name="paramName" value="lang" />
</bean>
<bean id="localeResolver"
class="org.springframework.web.servlet.i18n.CookieLocaleResolver">
<property name="defaultLocale" value="en"/>
</bean>
最后,这是我的web.xml文件:
<servlet>
<servlet-name>nbarraille</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>nbarraille</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/nbarraille-service.xml
/WEB-INF/nbarraille-data.xml
/WEB-INF/nbarraille-security.xml
</param-value>
</context-param>
您似乎还没有配置事务...您可以将以下内容添加到Context Data Config文件中: -
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<tx:advice id="txAdvice">
<tx:attributes>
<tx:method name="*" propagation="REQUIRED" />
</tx:attributes>
</tx:advice>
<aop:config>
<aop:advisor pointcut="execution(* YOUR.PACKAGE..*.*(..))" advice-ref="txAdvice" />
</aop:config>
将YOUR.PACKAGE更改为您的实际包名称,例如: -
execution(* com.project..*.*(..))
这是使用事务将所有方法包装在项目中的一种懒惰方法。
顺便说一句,如果你要在视图中懒洋洋地查询你的Hibernate域对象(例如: parent.getChildren()
),那么我强烈建议你将它添加到你的web.xml中: -
<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>hibernateFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
此过滤器将Hibernate会话扩展到视图。
我今天也有同样的问题。 它与hibernate工作概念和db事务连接。 很快就说了。 如果使用框架弹簧,它有自己的事务管理器和会话工厂的实例。 但是如果你想使用它,你需要记住配置它,但也要更正注释的顺序。 你的服务应该是@Transactional,你的DAO应该是@Repository,DAO使用@Entity bean。 因此,如果你要使用事务管理器的spring实现,你应该在你的控制器中使用你的事务服务;)它很简单,在你的dao中你做sessionfactory.getCurrentSession()来获取会话;)
对于它的价值......在遇到很多需要修改web.xml的部分之后,也要遇到这个问题:
<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
<init-param>
<param-name>singleSession</param-name>
<param-value>true</param-value>
</init-param>
</filter>
...特别需要将singleSession设置为true
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