Hibernate lazy instantiation problem

[drapierwim]

Can somebody help me I'm having a

net.sf.hibernate.LazyInitializationException: Hibernate lazy instantiation problem

Since my junit tests doesnt fail. I think that the answer of my problem lies with the J2ee container.

I'm using JBoss 4sp1, Hibernate 2.1 and xdoclet1.2.2 and a MySql DB, below is my msql-ds.xml

<?xml version="1.0" encoding="UTF-8"?>

<datasources>
 <local-tx-datasource>
 <jndi-name>MySqlDS</jndi-name>
 <connection-url>jdbc:mysql://server:3306/les</connection-url>
 <driver-class>com.mysql.jdbc.Driver</driver-class>
 <user-name>root</user-name>
 <password>root</password>
 <transaction-isolation>TRANSACTION_READ_COMMITTED</transaction-isolation>
 <track-statements>false</track-statements>
 <min-pool-size>10</min-pool-size>
 <max-pool-size>30</max-pool-size>
 <blocking-timeout-millis>10000</blocking-timeout-millis>
 <idle-timeout-minutes>15</idle-timeout-minutes>
 <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLExceptionSorter</exception-sorter-class-name>
 <check-valid-connection-sql>select LAST_INSERT_ID()</check-valid-connection-sql>
 <metadata>
 <type-mapping>mySQL</type-mapping>
 </metadata>
 </local-tx-datasource>
</datasources>

Thanks and sorry for my the poor english ;-)