Problème de Lazy Loading

Bonjour,
J'utilise Java5, JPA/Hibernate et spring, dans une petit application prototype.

Dans cette application j'ai des liens entre 3 entités : P06deodsp ,P05eodsp etP04todsp
j'ai 3 entités, la 1er est :

Code:

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@SuppressWarnings("unused")
@Entity
@Table(name="P06DEODSP")
public class P06deodsp extends BaseObject implements Serializable {
	 private static final long serialVersionUID = 3830326162173359411L;
	@Id
	@Column(name = "P06IDPKDEO", nullable = false)
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int p06idpkdeo;
 
	// --- Relation principale P06 (many) --> P07 (One)
	// --- implèmentée par une clè étrangère () dans P06
	@ManyToOne(fetch=FetchType.LAZY)
	@JoinColumn(name="P06IDCHG", nullable = true)
	private P07cochgp p07cochgp;
 
	// --- Relation principale P06 (many) --> P03 (One)
	// --- implèmentée par une clè étrangère (P06IDPKZDB) dans P06
	@ManyToOne(fetch=FetchType.LAZY)
	@JoinColumn(name="P06IDPKZDB", nullable = false)
	private P03zdbhip p03zdbhip;
 
	// --- Relation principale P06 (many) --> P05 (One)
	// --- implèmentée par une clè étrangère (P06IDPKEOD) dans P06
	@ManyToOne(fetch=FetchType.LAZY)
	@JoinColumn(name="P06IDPKEOD", nullable = false)
	private P05eodsp p05eodsp;
 
	@Column(name = "P06RANG", nullable = false)
	private short p06rang;
 
	@Column(name = "P06DESIGN", length = 30)
	private String p06design;
 
	@Column(name = "P06POS", nullable = false)
	private short p06pos;
 
	@Column(name = "P06TAILLE", nullable = false)
	private short p06taille;
 
	@Column(name = "P06OBLIG", length = 1 ,nullable = false)
	private char p06oblig;
 
	@Column(name = "P06REGLE", length = 20 ,nullable = false)
	private String p06regle;
 
	@Column(name = "P06ATRAIT", length = 1 ,nullable = false)
	private char p06atrait;

la deuxième est :

Code:

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@SuppressWarnings("unused")
@Entity
@Table(name="P05EODSP")
public class P05eodsp extends BaseObject implements Serializable {
	 private static final long serialVersionUID = 3831026162173359411L;
	@Id
	@Column(name = "P05IDPKEOD", nullable = false)
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int p05idpkeod;
 
	// --- Relation principale P05 (many) --> P04 (One)
	// --- implèmentée par une clè étrangère (P05IDPKODS) dans P06
	@ManyToOne(fetch=FetchType.LAZY)
	@JoinColumn(name="P05IDPKODS", nullable = false)
	private P04todsp p04todsp;
 
	@Column(name = "P05ENTITE", length = 10 ,nullable = false)
	private String p05entite;
 
	@Column(name = "P05DESIGN", length = 40)
	private String p05design;
 
	@Column(name = "P05ATRAIT", length = 1 ,nullable = false)
	private char p05atrait;	
 
 
	// --- Relation inverse P05 (One) --> P06 (Many)
	@OneToMany(mappedBy= "p05eodsp" , cascade = {CascadeType.ALL})
	private Set<P06deodsp> p06deodsps = new HashSet<P06deodsp>();

et la 3éme est :

Code:

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@SuppressWarnings("unused")
@Entity
@Table(name="P04TODSP")
public class P04todsp extends BaseObject implements Serializable {
 
	private static final long serialVersionUID = 3896626162173359411L;
	@Id
	@Column(name = "P04IDPKODS", nullable = false)
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int p04idpkods;
 
	// --- Relation principale P04 (many) --> P01 (One)
	// --- implèmentée par une clè étrangère (P04IDPKIP) dans P06
	@ManyToOne(fetch=FetchType.LAZY)
	@JoinColumn(name="P04IDPKIP", nullable = false)
	private P01ipmacp p01ipmacp;
 
	@Column(name = "P04TABLE", length = 10 ,nullable = false)
	private String p04table;
 
	@Column(name = "P04DESIGNT", length = 40)
	private String p04designt;
 
	@Column(name = "P04ZONE", length = 10 ,nullable = false)
	private String p04zone;
 
	@Column(name = "P04DESIGNZ", length = 40)
	private String p04designz;
 
	@Column(name = "P04TYPE", length = 10 ,nullable = false)
	private String p04type;
 
	@Column(name = "P04TAILLE", nullable = false)
	private BigDecimal p04taille;
 
	@Column(name = "P04ATRAIT", length = 1 ,nullable = false)
	private char p04atrait;
 
 
	// --- Relation inverse P04 (One) --> P05 (Many)
	@OneToMany(mappedBy= "p04todsp" , cascade = {CascadeType.ALL})
	private Set<P05eodsp> p05eodsps = new HashSet<P05eodsp>();

Mon fichier Spring est le suivant :

Code:

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
 
	<!-- couches applicatives -->
	<bean id="dao" class="odas.toolbox.persistance.dao.Dao" />
 
 
	<bean id="universalDao" class="odas.toolbox.persistance.dao.UniversalDao" />
 
	<bean id="service" class="odas.toolbox.persistance.service.Service">
		<property name="dao" ref="dao" />
	</bean>
 
 
	<bean id="universalManager" class="odas.toolbox.service.impl.UniversalManagerImpl">
		<property name="universalDao" ref="universalDao" />
	</bean>
 
	<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="jpaVendorAdapter">
			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
 
					<property name="showSql" value="true" />
 
				<property name="databasePlatform" value="org.hibernate.dialect.DB2400Dialect" />
				<property name="generateDdl" value="false" />
			</bean>
		</property>
		<property name="loadTimeWeaver">
			<bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver" />
		</property>
	</bean>
 
 
	<!-- la source de donnéees DBCP -->
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
		<property name="driverClassName" value="com.ibm.as400.access.AS400JDBCDriver" />
		<property name="url" value="jdbc:as400://tersudm/decision" />
		<property name="username" value="CFT" />
		<property name="password" value="CFT" />
	</bean>
 
	<!-- le gestionnaire de transactions -->
	<tx:annotation-driven transaction-manager="txManager" />
	<bean id="txManager" class="org.springframework.orm.jpa.JpaTransactionManager">
		<property name="entityManagerFactory" ref="entityManagerFactory" />
	</bean>
 
	<!-- traduction des exceptions -->
	<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
 
	<!-- persistence -->
	<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
 
</beans>

lorsque j'essaie de recupérer l'entité P05eodsp à partir de l'entité P06deodsp j'ai l'erreur suivante :

Code:

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Hibernate: select p06deodsp0_.P06IDPKDEO as P1_5_, p06deodsp0_.P06IDCHG as P10_5_, p06deodsp0_.P06IDPKZDB as P9_5_, p06deodsp0_.P06IDPKEOD as P11_5_, p06deodsp0_.P06RANG as P2_5_, p06deodsp0_.P06DESIGN as P3_5_, p06deodsp0_.P06POS as P4_5_, p06deodsp0_.P06TAILLE as P5_5_, p06deodsp0_.P06OBLIG as P6_5_, p06deodsp0_.P06REGLE as P7_5_, p06deodsp0_.P06ATRAIT as P8_5_ from P06DEODSP p06deodsp0_
Hibernate: select p06deodsp0_.P06IDPKDEO as P1_5_0_, p06deodsp0_.P06IDCHG as P10_5_0_, p06deodsp0_.P06IDPKZDB as P9_5_0_, p06deodsp0_.P06IDPKEOD as P11_5_0_, p06deodsp0_.P06RANG as P2_5_0_, p06deodsp0_.P06DESIGN as P3_5_0_, p06deodsp0_.P06POS as P4_5_0_, p06deodsp0_.P06TAILLE as P5_5_0_, p06deodsp0_.P06OBLIG as P6_5_0_, p06deodsp0_.P06REGLE as P7_5_0_, p06deodsp0_.P06ATRAIT as P8_5_0_ from P06DEODSP p06deodsp0_ where p06deodsp0_.P06IDPKDEO=?
17:14:51,133 ERROR LazyInitializationException:19 - could not initialize proxy - the owning Session was closed
org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed
	at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:60)
	at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111)
	at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:172)
	at odas.toolbox.persistance.jpa.hibernate.model.P05eodsp$$EnhancerByCGLIB$$b9ad7f0d.getP04todsp(<generated>)
	at odas.toolbox.persistance.GestionnaireParametrageEngine.performBatch(GestionnaireParametrageEngine.java:428)
	at odas.toolbox.persistance.GestionnaireParametrageEngine.performBatch(GestionnaireParametrageEngine.java:396)
	at odas.toolbox.rmi.test.TestPersistance.main(TestPersistance.java:22)

Merci d'avance pour votre aide