Probleme de persistance : java.lang.IllegalArgumentException: Unknown entity.

Bonsoir à tous,
J'ai un problème de persistance lorsque je fais mes tests unitaires :

Code:

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java.lang.IllegalArgumentException: Unknown entity: com.model.remote.entities.Model
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:193)
	at org.ow2.easybeans.persistence.TxEntityManager.find(TxEntityManager.java:114)......
Caused by: org.hibernate.MappingException: Unknown entity: com.model.remote.entities.Model

J'ai mon EJB "ModelServiceBean"

Code:

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package com.model.ejb.v1;
 
public class ModelServiceBean implements ModelServiceSEI {
 
	private static final HWLogger logger = new HWLogger(ModelServiceBean.class);
 
	@PersistenceContext(unitName = "hw.model.pu")
	private EntityManager manager;
 
	@Resource(mappedName = "hwDS")
	private DataSource datasource;
 
	@EJB
	private SearchServiceLocal searchService;
 
etc....

mon persistance.xml

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<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
	xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
	<persistence-unit name="hw.model.pu" transaction-type="JTA">
		<jta-data-source>hwDS</jta-data-source> 
		<properties>
			<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
			<property name="hibernate.show_sql" value="false" />
			<property name="hibernate.format_sql" value="true" />
			<property name="hibernate.cache.use_second_level_cache" value="true" />
			<property name="hibernate.cache.use_query_cache" value="false" />
			<property name="hibernate.cache.provider_configuration_file_resource_path" value="ehcache.xml" />
			<property name="hibernate.cache.provider_class" value="net.sf.ehcache.hibernate.EhCacheProvider" />
			<property name="net.sf.ehcache.configurationResourceName" value="/com/model/cache/ehcache.xml" />
		</properties>	
	</persistence-unit>
</persistence>

Et mon fichier Model.java

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package com.model.remote.entities;
 
@Entity
@Table(name = "T_MODEL")
public class Model {
 
	@Id
	@GeneratedValue(generator = "InvSeq")
	@SequenceGenerator(name = "InvSeq", sequenceName = "T_MODEL_ID_SEQ", allocationSize = 5)
	@Column(name = "ID_MODEL")
	protected Long id;
 
	@Column(name = "T_M_ID_MODEL")
	protected Long idParent;

Certes, mon "entitie" Model n'est pas dans le même projet que mon EJB, mais il est inclus dans mon classpath et à la compilation, j'ai n'ai pas d'erreur.
C'est plus lorsque je tomber sur un testUnitaire, il plante sur ce type de méthode, lors d'un find :

Code:

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@TransactionAttribute(value = TransactionAttributeType.NOT_SUPPORTED)
	@Interceptors(CheckerOnModel.class)
	public ItemModel getModel(String sc, Long id, Long version)
			throws HWException {
		ItemModel itemModel = new ItemModel();
		Model model = null;

		try {
			model = manager.find(Model.class, id);

Si quelqu'un peut m'eclairer, merci d'avance ;)