this is for hibernate3 using mysql

I have 2 objects; User and Group. users have many groups. everything is ok unit i try to make the link bi-directional, i get a LazyInitializationException (illegal access to loading collection)

here are my mapping files

User.hbm.xml
-----------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >

<hibernate-mapping>
<class name="com.bioinfocg.handset.model.User" table="user">
<id name="id" column="user_id" unsaved-value="0">
<generator class="native"/>
</id>
<property name="username"/>
<property name="password"/>
<property name="fullName" column="full_name"/>
<property name="type"/>

<set name="groups" table="user_group">
<key column="user_id"/>
<many-to-many column="group_id" class="com.bioinfocg.handset.model.Group"/>
</set>

<set name="emails" table="user_email">
<key column="user_id"/>
<element type="string" column="email"/>
</set>

</class>
</hibernate-mapping>




Group.hbm.xml
-------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >

<hibernate-mapping>
<class name="com.bioinfocg.handset.model.Group" table="groups">
<id name="id" column="group_id" unsaved-value="0">
<generator class="native"/>
</id>
<property name="name"/>
<property name="active"/>

<set name="users" table="user_group" inverse="true">
<key column="group_id"/>
<many-to-many column="user_id" class="com.bioinfocg.handset.model.User"/>
</set>

</class>
</hibernate-mapping>



any help would be appreciated.

restep through your java - you will find that somewhere the session is being closed to early in in your clearly defined unit of work.

i don't think that's it.


i've got a unit test testing a simple method which is basically just loading a User object, and checking the size of the groups set.

the setUp() contains

Session s = sf.openSession();
TransactionSynchronizationManager
.bindResource(sf, new SessionHolder(s));


the tearDown() contains

SessionHolder holder = (SessionHolder)
TransactionSynchronizationManager.getResource(sf);
Session s = holder.getSession();
s.flush();
TransactionSynchronizationManager.unbindResource(sf);
SessionFactoryUtils.releaseSession(s, sf);


i'm also using spring.


Marc

I don't do Spring ;)

Post the full TestCase, as well as the full stacktrace.