(EntityManager) Erreur lors du commit
Bonjour,
J'ai un souci avec l'insertion et la lecture de donnée de ma base (postgresql).
Pour l’insertion j'ai une erreur lors du commit() et pour la lecture c'est lors du em.find(). Les 2 erreurs sont différentes mais je pense, viennent du même problème qui se trouve sur la clé primaire.
Voici l'entité de la table dans laquel je tente d'inserer :
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| @Entity
@Cacheable(true)
@Table(name = "game", schema="nintendo")
@Multitenant(MultitenantType.TABLE_PER_TENANT)
@TenantTableDiscriminator(type = TenantTableDiscriminatorType.SCHEMA, contextProperty = PersistenceUnitProperties.MULTITENANT_PROPERTY_DEFAULT)
public class Game implements Serializable{
private static final long serialVersionUID = 1L;
@Id
@Column(name = "game_id", unique = true, nullable = false)
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int gameId;
@Column(name = "game_title", length = 256)
private String gameTitle;
@Temporal(TemporalType.DATE)
@Column(name = "game_released")
private Date gameReleased; |
Et voici comment je tente d'insérer :
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|
EntityManagerFactory emf = Persistence.createEntityManagerFactory("projet_nintendo");
EntityManager em = emf.createEntityManager();
EntityTransaction transac = em.getTransaction();
transac.begin();
Game g = new Game();
g.setGameId(Conversion.stringEnInt(array.getJSONObject(ii).getString("fs_id")));
g.setGameTitle(array.getJSONObject(ii).getString("title"));
em.persist(g);
System.err.println(g.getGameTitle());
System.err.println(g.getGameId());
transac.commit();
em.close();
emf.close(); |
La lecture de l'objet "g" avant le commit se fait bien, je retrouve bien les informations que j'y ai mis.
Ça plante lors du "transac.commit()" et j'ai l'erreur suivante :
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| Exception in thread "main" javax.persistence.RollbackException: Exception [EclipseLink-69] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: A NullPointerException was thrown while extracting a value from the instance variable [gameId] in the object [database.orm.Game].
Internal Exception: java.lang.NullPointerException
Mapping: org.eclipse.persistence.mappings.DirectToFieldMapping[gameId-->nintendo.game.game_id]
Descriptor: RelationalDescriptor(database.orm.Game --> [DatabaseTable(nintendo.game)])
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:157)
at test.main(test.java:84)
Caused by: Exception [EclipseLink-69] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: A NullPointerException was thrown while extracting a value from the instance variable [gameId] in the object [database.orm.Game].
Internal Exception: java.lang.NullPointerException
Mapping: org.eclipse.persistence.mappings.DirectToFieldMapping[gameId-->nintendo.game.game_id]
Descriptor: RelationalDescriptor(database.orm.Game --> [DatabaseTable(nintendo.game)])
at org.eclipse.persistence.exceptions.DescriptorException.nullPointerWhileGettingValueThruInstanceVariableAccessor(DescriptorException.java:1277)
at org.eclipse.persistence.internal.descriptors.InstanceVariableAttributeAccessor.getAttributeValueFromObject(InstanceVariableAttributeAccessor.java:88)
at org.eclipse.persistence.mappings.DatabaseMapping.getAttributeValueFromObject(DatabaseMapping.java:630)
at org.eclipse.persistence.mappings.foundation.AbstractDirectMapping.writeFromObjectIntoRow(AbstractDirectMapping.java:1283)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildRow(ObjectBuilder.java:1566)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildRow(ObjectBuilder.java:1554)
at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.insertObjectForWrite(DatabaseQueryMechanism.java:451)
at org.eclipse.persistence.queries.InsertObjectQuery.executeCommit(InsertObjectQuery.java:80)
at org.eclipse.persistence.queries.InsertObjectQuery.executeCommitWithChangeSet(InsertObjectQuery.java:90)
at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.executeWriteWithChangeSet(DatabaseQueryMechanism.java:301)
at org.eclipse.persistence.queries.WriteObjectQuery.executeDatabaseQuery(WriteObjectQuery.java:58)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:899)
at org.eclipse.persistence.queries.DatabaseQuery.executeInUnitOfWork(DatabaseQuery.java:798)
at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWorkObjectLevelModifyQuery(ObjectLevelModifyQuery.java:108)
at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWork(ObjectLevelModifyQuery.java:85)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2896)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1804)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1786)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1737)
at org.eclipse.persistence.internal.sessions.CommitManager.commitNewObjectsForClassWithChangeSet(CommitManager.java:226)
at org.eclipse.persistence.internal.sessions.CommitManager.commitAllObjectsWithChangeSet(CommitManager.java:125)
at org.eclipse.persistence.internal.sessions.AbstractSession.writeAllObjectsWithChangeSet(AbstractSession.java:4207)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabase(UnitOfWorkImpl.java:1441)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1531)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.commitRootUnitOfWork(RepeatableWriteUnitOfWork.java:277)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitAndResume(UnitOfWorkImpl.java:1169)
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:132)
... 1 more
Caused by: java.lang.NullPointerException
at org.eclipse.persistence.internal.descriptors.InstanceVariableAttributeAccessor.getAttributeValueFromObject(InstanceVariableAttributeAccessor.java:76)
... 26 more |
Pour la lecture, voici le code :
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EntityManagerFactory emf = Persistence.createEntityManagerFactory("projet_nintendo");
EntityManager em = emf.createEntityManager();
EntityTransaction transac = em.getTransaction();
transac.begin();
Game g = em.find(database.orm.Game.class, 125);
System.err.println(g.getGameTitle());
System.err.println(g.getGameId());
transac.commit();
em.close();
emf.close(); |
Ca plante sur la ligne ou je fais le em.find() et j'ai l'erreur suivante :
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| Exception in thread "main" java.lang.NullPointerException
at org.eclipse.persistence.internal.jpa.CMP3Policy.createPrimaryKeyFromId(CMP3Policy.java:224)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.findInternal(EntityManagerImpl.java:797)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.find(EntityManagerImpl.java:719)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.find(EntityManagerImpl.java:588)
at test.main(test.java:58) |
Donc à chaque fois il est question de la clé primaire. J'ai essayé, dans ma base de la mettre en serial pour l'incrémenter toute seule mais aussi de l'incrémenter moi même mais l'un ou l'autre ne change rien.
Je pense que j'ai du oublié quelque chose dans la description de mon entité ou dans le persistence.xml mais je ne vois pas quoi.
Je vous mets le persistence.xml en plus si vous voyez quelque chose :
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| <?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="projet_nintendo">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>database.orm.Utilisateur</class>
<class>database.orm.Game</class>
<class>database.orm.Currency</class>
<class>database.orm.Country</class>
<class>database.orm.Price</class>
<class>database.orm.Favoris</class>
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5433/projet_nintendo" /> <!-- BD Mane -->
<property name="javax.persistence.jdbc.user" value="postgres" /> <!-- DB User -->
<property name="javax.persistence.jdbc.password" value="monPassword" /> <!-- DB Password -->
<property name="eclipselink.logging.level" value="OFF"/>
<property name="eclipselink.cache.shared.default" value="true"/>
<property name="eclipselink.multitenant.tenants-share-cache" value="true"/>
<property name="eclipselink.query-results-cache" value="true"/>
</properties>
</persistence-unit>
</persistence> |
P.S, la connexion à la base se fait bien.
Merci de votre aide.
