プロジェクトは、Hibernate (JPA)、Spring、および Maven を使用します。別の JAR 内のエンティティと DAO。
pom.xml:
<project ...>
...
<artifactId>database</artifactId>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>3.5.4-Final</version>
</dependency>
</dependencies>
</project>
ダオ:
public class AbstractDAO<T extends BaseEntity> implements GenericDAO<T> {
private final Class<T> persistentClass;
private EntityManager entityManager;
public AbstractDAO(Class<T> entityClass) {
super();
this.persistentClass = entityClass;
}
@PersistenceContext
public void setEntityManager(EntityManager entityManager) {
this.entityManager = entityManager;
}
public EntityManager getEntityManager() {
return entityManager;
}
...
public void fooBar() {
//Exception from this line
Session session = getEntityManager().unwrap(Session.class);
...
}
....
}
Spring を使用するモジュールがあります。
pom.xml:
<project ...>
...
<artifactId>api</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.version}</version>
</dependency>
....
</dependencies>
...
</project>
AppContext.xml:
<bean id="authService" scope="singleton" class="com.test.management.AuthServiceImpl" />
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" name="EntityManagerFactory">
<property name="persistenceUnitName" value="default"></property>
<property name="dataSource" ref="dataSource"></property>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true" />
<property name="generateDdl" value="true" />
<property name="databasePlatform" value="${db.dialect}" />
</bean>
</property>
</bean>
<!-- Values are defined in db.properties -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${db.driver}" />
<property name="url" value="${db.url}" />
<property name="username" value="${db.username}" />
<property name="password" value="${db.password}" />
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager" name="TransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"></property>
</bean>
<tx:annotation-driven />
<bean id="userDAO" scope="singleton" class="com.test.database.dao.impl.UserDAOImpl">
</bean>
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
</beans>
サービス：
public class AuthServiceImpl implements AuthService {
@Autowired
private UserDAO userDAO;
@Override
public void authorization() {
userDAO.fooBar();
}
}
EntityManager からセッションを取得しようとすると、次の例外が発生します。
java.lang.IllegalStateException: No transactional EntityManager available
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:223)
at $Proxy121.unwrap(Unknown Source)