org.hibernate.type.SerializationException: could not deserialize
	at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:211)
	at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:234)
	at org.hibernate.type.SerializableType.fromBytes(SerializableType.java:78)
	at org.hibernate.type.SerializableType.get(SerializableType.java:39)
	at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:113)
	at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:102)
	at org.hibernate.type.AbstractType.hydrate(AbstractType.java:81)
	at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:1899)
	at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1372)
	at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1300)
	at org.hibernate.loader.Loader.getRow(Loader.java:1197)
	at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:569)
	at org.hibernate.loader.Loader.doQuery(Loader.java:689)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
	at org.hibernate.loader.Loader.loadCollection(Loader.java:1919)
	at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:71)
	at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:520)
	at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
	at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1695)
	at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
	at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
	at org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
	at org.hibernate.collection.PersistentSet.size(PersistentSet.java:114)
	at org.medias.eccad.persistance.hibernate.domaine.Produit.toString(Produit.java:185)
	at org.medias.eccad.persistance.hibernate.XmlDAOhibernate.getXmlByProduit(XmlDAOhibernate.java:23)
	at org.medias.eccad.persistance.test.TestXmlDAOhibernate.testGetXmlByProduit(TestXmlDAOhibernate.java:16)
	at jrockit.reflect.VirtualNativeMethodInvoker.invoke(Ljava.lang.Object;[Ljava.lang.Object;)Ljava.lang.Object;(Unknown Source)
	at java.lang.reflect.Method.invoke(Ljava.lang.Object;[Ljava.lang.Object;J)Ljava.lang.Object;(Unknown Source)
	at junit.framework.TestCase.runTest(TestCase.java:166)
Caused by: java.io.StreamCorruptedException: invalid stream header
	at java.io.ObjectInputStream.readStreamHeader()V(Unknown Source)
	at java.io.ObjectInputStream.<init>(Ljava.io.InputStream;)V(Unknown Source)
	at org.hibernate.util.SerializationHelper$CustomObjectInputStream.<init>(SerializationHelper.java:246)
	at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:203)
	at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:234)
	at org.hibernate.type.SerializableType.fromBytes(SerializableType.java:78)
	at org.hibernate.type.SerializableType.get(SerializableType.java:39)
	at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:113)
	at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:102)
	at org.hibernate.type.AbstractType.hydrate(AbstractType.java:81)
	at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:1899)
	at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1372)
	at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1300)
	at org.hibernate.loader.Loader.getRow(Loader.java:1197)
	at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:569)
	at org.hibernate.loader.Loader.doQuery(Loader.java:689)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
	at org.hibernate.loader.Loader.loadCollection(Loader.java:1919)
	at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:71)
	at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:520)
	at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
	at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1695)
	at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)
	at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
	at org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:109)
	at org.hibernate.collection.PersistentSet.size(PersistentSet.java:114)
	at org.medias.eccad.persistance.hibernate.domaine.Produit.toString(Produit.java:185)
	at org.medias.eccad.persistance.hibernate.XmlDAOhibernate.getXmlByProduit(XmlDAOhibernate.java:23)
	at org.medias.eccad.persistance.test.TestXmlDAOhibernate.testGetXmlByProduit(TestXmlDAOhibernate.java:16)