web.xml中加入
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter>
<filter-name>OpenSessionInViewFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>OpenSessionInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
两个类的XML如下，一个是Student类，一个是课程类，Course
<hibernate-mapping>
<class name="com.bzu.entity.Course" table="Course">
<cache usage="read-write" region="com.bzu.entity.Course"></cache>
<id name="id" type="java.lang.Integer">
<column name="Id" />
<generator class="native" />
</id>
<version name="version" column="version" type="integer"></version>
<property name="name" type="java.lang.String">
<column name="Name" length="10" not-null="true" />
</property>
<property name="lessonTime" type="java.lang.Integer"/>
<property name="lessonHour" type="java.lang.Integer"/>
<property name="lessonPoints" type="java.lang.Integer"/>
<set name="students" table="stu_course" cascade="save-update" lazy="true">
<key column="course_id"/>
<many-to-many class="com.bzu.entity.Student" column="stu_id"></many-to-many>
</set>
</class>
</hibernate-mapping>
<hibernate-mapping>
<class name="com.bzu.entity.Student" table="Student">
<cache usage="read-write" region="com.bzu.entity.Student"></cache>
<id name="id" type="java.lang.Integer">
<column name="Id" />
<generator class="native" />
</id>
<version name="version" column="version" type="integer"></version>
<property name="name" type="java.lang.String">
<column name="Name" length="10" not-null="true" />
</property>
<property name="idCard" type="java.lang.String">
<column name="idCard" length="50" />
</property>
<property name="password" type="java.lang.String" />
<property name="sex" type="java.lang.Integer">
<column name="sex" length="30" />
</property>
<property name="birthday" type="java.lang.String">
<column name="birthday" length="10" />
</property>
<property name="major" type="java.lang.String">
<column name="major" length="30" />
</property>
<property name="photopath" type="java.lang.String" />
<set name="courses" table="stu_course" cascade="save-update" lazy="true">
<key column="stu_id" />
<many-to-many class="com.bzu.entity.Course" column="course_id" ></many-to-many>
</set>
</class>
</hibernate-mapping>
调用的时候根据学生ID去查询那个学生选了什么课程
public String getCourse() {
Set<Course> set = dao.getCourse(Student.class, stu.getId());
ServletActionContext.getRequest().getSession().setAttribute("set", set);
return SUCCESS;
}
////////////调用dao.getCourse
public Set<Course> getCourse(Class clazz, Serializable id) {
Set<Course> set = new HashSet<Course>();
Student stu = null;
System.out.println("getCourse()++++++++++01");
if (HibernateUtil.select(clazz, id) != null) {
System.out.println("getCourse()++++++++++02");
stu = (Student) HibernateUtil.select(clazz, id);
System.out.println("getCourse()++++++++++03");
set = stu.getCourses();
System.out.println("getCourse()++++++++++04");
return set;
}
else
return null;
}
当执行完set = stu.getCourses();打印System.out.println("getCourse()++++++++++04");的时候就报
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.bzu.entity.Student.courses, no session or session was closed
我已经在WEB.XML里面加入了OpenSessionInViewFilter了呀，WEB浏览器报的错误又是
org.apache.jasper.JasperException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.bzu.entity.Student.courses, no session or session was closed
小弟是新手，请假大家了
