salut tout le monde :
voila mon Client.hbm

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
<class name="com.mines.hibernate.Client" table="client">
<id name="IdClient" type="string">
<column name="ID_Client" sql_type="char(30)" />
<generator class="increment" />
</id>

<property name="ListeSecteur" type="string" >
<column name="Liste_secteur" sql_type="char(30)" not-null="false" />
</property>

<property name="Mail" type="string">
<column name="Mail" sql_type="char(80)" not-null="false" />
</property>

<property name="Addresse" type="string" >
<column name="Addresse" sql_type="char(120)" not-null="false" />
</property>


<property name="Tel" type="string">
<column name="Tel" sql_type="char(14)" not-null="false" />
</property>


<property name="Login" type="string">
<column name="Login" sql_type="char(30)" not-null="false" />
</property>


</class>

</hibernate-mapping>
et quand j'exécute mon programme sous eclipse 2 , hiberbnate é, bd mysql il donne :

11 mai 2006 15:25:27 net.sf.hibernate.cfg.Environment <clinit>
INFO: Hibernate 2.1.6
11 mai 2006 15:25:27 net.sf.hibernate.cfg.Environment <clinit>
INFO: hibernate.properties not found
11 mai 2006 15:25:27 net.sf.hibernate.cfg.Environment <clinit>
INFO: using CGLIB reflection optimizer
11 mai 2006 15:25:27 net.sf.hibernate.cfg.Configuration configure
INFO: configuring from resource: /hibernate.cfg.xml
11 mai 2006 15:25:27 net.sf.hibernate.cfg.Configuration getConfigurationInputStream
INFO: Configuration resource: /hibernate.cfg.xml
11 mai 2006 15:25:27 net.sf.hibernate.cfg.Configuration addResource
INFO: Mapping resource: Client.hbm
11 mai 2006 15:25:27 net.sf.hibernate.util.XMLHelper$ErrorLogger error
GRAVE: Error parsing XML: XML InputStream(8) Lattribut "{0}" nest pas déclaré pour lélément "{1}".
11 mai 2006 15:25:27 net.sf.hibernate.util.XMLHelper$ErrorLogger error
GRAVE: Error parsing XML: XML InputStream(13) Lattribut "{0}" nest pas déclaré pour lélément "{1}".
11 mai 2006 15:25:27 net.sf.hibernate.util.XMLHelper$ErrorLogger error
GRAVE: Error parsing XML: XML InputStream(17) Lattribut "{0}" nest pas déclaré pour lélément "{1}".
11 mai 2006 15:25:27 net.sf.hibernate.util.XMLHelper$ErrorLogger error
GRAVE: Error parsing XML: XML InputStream(21) Lattribut "{0}" nest pas déclaré pour lélément "{1}".
11 mai 2006 15:25:27 net.sf.hibernate.util.XMLHelper$ErrorLogger error
GRAVE: Error parsing XML: XML InputStream(26) Lattribut "{0}" nest pas déclaré pour lélément "{1}".
11 mai 2006 15:25:27 net.sf.hibernate.util.XMLHelper$ErrorLogger error
GRAVE: Error parsing XML: XML InputStream(31) Lattribut "{0}" nest pas déclaré pour lélément "{1}".
java.lang.ExceptionInInitializerError
at Test.main(Test.java:8)
Caused by: java.lang.RuntimeException: Problème de configuration : Error reading resource: Client.hbm
at com.mines.hibernate.HibernateUtil.<clinit>(HibernateUtil.java:12)
... 1 more
Caused by: net.sf.hibernate.MappingException: Error reading resource: Client.hbm
at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:339)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:1013)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:969)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:897)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:883)
at com.mines.hibernate.HibernateUtil.<clinit>(HibernateUtil.java:10)
... 1 more
Caused by: net.sf.hibernate.MappingException: invalid mapping
at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:287)
at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:336)
... 6 more
Caused by: org.xml.sax.SAXParseException: Lattribut "{0}" nest pas déclaré pour lélément "{1}".
at org.apache.crimson.parser.Parser2.error(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.parseInternal(Unknown Source)
at org.apache.crimson.parser.Parser2.parse(Unknown Source)
at org.apache.crimson.parser.XMLReaderImpl.parse(Unknown Source)
at org.dom4j.io.SAXReader.read(SAXReader.java:339)
at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:286)
... 7 more
Exception in thread "main"

sql-type (avec un tirait) et non sql_type (avec un underscore)

(check the dtd :)