这是我第一次真正接触 JPA,我正在尝试运行最简单的更新语句。我在使用 Hibernate 作为 JPA 实现的 jBoss 7.1.x 服务器中运行。任何帮助将不胜感激..
这是我的 EntityManager 的生产者方法:
@ApplicationScoped
public class EntityManagerProducer
{
@PersistenceContext
private EntityManager entityManager;
@Produces
@RequestScoped
public EntityManager getEntityManager()
{
return entityManager;
}
}
这是尝试执行更新的 DAO 方法:
@Inject EntityManager em;
public void updateRequestStatus(String requestNumber, String newStatus)
{
em.getTransaction().begin();
ServiceRequestEntity serviceRequestToUpdate = em.find(RequestEntity.class, requestNumber);
requestToUpdate.setStatus(newStatus);
em.merge(serviceRequestToUpdate);
em.getTransaction().commit();
}
这是persistence.xml:
<?xml version="1.0" encoding="UTF-8"?>
<persistence 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_2_0.xsd"
version="2.0">
<persistence-unit name="database" transaction-type="RESOURCE_LOCAL">
<jta-data-source>java:/jdbc/myDS</jta-data-source>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.format_sql" value="false" />
<property name="hibernate.use_sql_comments" value="true" />
</properties>
</persistence-unit>
</persistence>
这是错误消息(如果需要,可以提供完整的堆栈跟踪 - 它在“合并”行阻塞):
javax.persistence.TransactionRequiredException: JBAS011469: Transaction is required to perform this operation (either use a transaction or extended persistence context)
....
at org.jboss.weld.proxies.EntityManager$-1727851269$Proxy$_$$_WeldClientProxy.merge(EntityManager$-1727851269$Proxy$_$$_WeldClientProxy.java) [weld-core-1.1.5.AS71.Final.jar:]