在dao数据访问层操作数据库时用同一个Session，以前JDBC用构造器获取的

Java code?public class BookDao extends HibernateDaoSupport {     private Session se;           public BookDao(){         se=this.getSession();     }       public void save(Book book) {         se.save(book);     }

整合SSH后报这类错误

 <SPAN style="COLOR: #ff0000"> org.springframework.beans.factory.BeanCreationException: </SPAN>Error creating bean with name 'BookDao' defined in class path resource [applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.gdpi.dao.BookDao]: Constructor threw exception; nested exception is java.lang.NullPointerException

applicationContext.xml的BookDao注入方式如下

 <bean id="BookDao" class="com.gdpi.dao.BookDao">         <property name="sessionFactory">             <ref bean="sessionFactory" />         </property>     </bean>

改成如下代码可以，但每次save当获得一个新的session

 public class BookDao extends HibernateDaoSupport {     private Session se;       public void save(Book book) {         se=this.getSession();         se.save(book);     }

通过MyEclipse自动生成所需要的包，版本在标签里有。

<prop key="current_session_context_class">thread</prop>
或者这个
<prop key="hibernate.current_session_context_class">thread</prop>