добрый день !
возник такой вот вопрос - как заставить работать связку
Tomcat + EclipseLink (ORM) ? без спринга ! Помогите разобраться !
ошибка в сервлете при вызове
em = emf.createEntityManager(); - emf = null !
не видит Tomcat что есть PersistenceUnit
что есть :
tomcat - servlet - model bean - mysql
Entity созданный по таблице :
| Код |
@Entity
@Table(name = "USER", catalog = "db", schema = "")
@XmlRootElement
@NamedQueries({....})
public class User implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "id", nullable = false)
private Integer id;
....
get
set
}
|
сервлет
| Код |
WebServlet(name = "ListPersonServlet", urlPatterns = {"/ListPersonServlet"})
public class ListPersonServlet extends HttpServlet {
@PersistenceUnit(unitName="WebPU" , name="persistence/em")
private EntityManagerFactory emf;
....
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
....
EntityManager em = null;
try {
List persons = Collections.EMPTY_LIST;
em = emf.createEntityManager();
persons = em.createNamedQuery("SELECT t FROM User t").getResultList();
....
|
в em = emf.createEntityManager(); - emf = null !
persistence
| Код |
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" 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">
<persistence-unit name="WebPU" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>model.User</class>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/db"/>
<property name="javax.persistence.jdbc.password" value="123456"/>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="javax.persistence.jdbc.user" value="root"/>
<property name="eclipselink.session.customizer" value="util.EclipseLinkSessionCustomizer" />
</properties>
</persistence-unit>
</persistence>
|
EclipseLinkSessionCustomizer
| Код |
import org.eclipse.persistence.config.SessionCustomizer;
import org.eclipse.persistence.sessions.JNDIConnector;
import org.eclipse.persistence.sessions.Session;
public class EclipseLinkSessionCustomizer implements SessionCustomizer{
@Override
public void customize(Session session) throws Exception {
JNDIConnector connector = (JNDIConnector) session.getLogin().getConnector();
connector.setLookupType(JNDIConnector.STRING_LOOKUP);
}
}
|
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