ERROR LazyInitializationException:42 - failed to lazily initialize a collection

ERROR LazyInitializationException:42 - failed to lazily initialize a collection of role: com.lixueli.business.model.Person.events, no session or session was closed

 

在配置文件中加入lazy="false"即可

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
  <class name="com.lixueli.business.model.Person" table="person">
    <id name="id" column="PERSON_ID">
    	<generator class="native"></generator>
    </id>
    <property name="age"></property>
    <property name="firstName"></property>
    <property name="lastName"></property>
     <set name="events" table="PERSON_EVENT" lazy="false">
     	<key column="PERSON_ID"></key>
     	<many-to-many column="EVENT_ID" class="com.lixueli.business.model.Event"></many-to-many>
     </set>
  </class>
  
</hibernate-mapping>