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Je suis nouveau à la technologie java si s'il vous plaît excusez-moi si je vous présente un problème stupide ...Pourquoi CreateEntityManager retourne NULL
Je veux faire un servlet JSF 2.0 et MySql pour le moteur de base de données.
Le problème est qu'il semble que je ne peux pas me connecter au serveur.
J'utilise NetBeans IDE, et pour guide, j'utiliser un tutoriel de youtube: http://www.youtube.com/watch?v=UBNaiVWwAZw&feature=related
La différence est que j'utilise Tomcat.
Mon fichier persistence.xml est dans le Web/META-INF/persistence.xml et le contenu est:
<?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="AnunturiJsfPU" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>my.servlets.Users</class>
<class>my.servlets.UsersSessions</class>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/tz_cadastru_galati"/>
<property name="javax.persistence.jdbc.password" value=""/>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="javax.persistence.jdbc.user" value="root"/>
</properties>
</persistence-unit>
</persistence>
mon fichier servlet est:
package my.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(name = "testOkServlet2", urlPatterns = {"/testOkServlet2"})
public class testOkServlet2 extends HttpServlet {
@PersistenceUnit
EntityManagerFactory emf;
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
EntityManager em = emf.createEntityManager();
Users u = (Users) em.createNamedQuery("Users.findAll").getResultList().get(0);
String myUser = u.getUserNume();
out.println("User:" + myUser);
} catch (Exception e)
{
out.println(e.getMessage());
}
finally {
out.close();
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
ce qui est mon objet Usagers :
package my.servlets;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.xml.bind.annotation.XmlRootElement;
@Entity
@Table(name = "users")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Users.findAll", query = "SELECT u FROM Users u"),
@NamedQuery(name = "Users.findByUserID", query = "SELECT u FROM Users u WHERE u.userID = :userID"),
@NamedQuery(name = "Users.findByUserNume", query = "SELECT u FROM Users u WHERE u.userNume = :userNume"),
@NamedQuery(name = "Users.findByNumePrenume", query = "SELECT u FROM Users u WHERE u.numePrenume = :numePrenume"),
@NamedQuery(name = "Users.findByEmail", query = "SELECT u FROM Users u WHERE u.email = :email"),
@NamedQuery(name = "Users.findByParola", query = "SELECT u FROM Users u WHERE u.parola = :parola"),
@NamedQuery(name = "Users.findByContActiv", query = "SELECT u FROM Users u WHERE u.contActiv = :contActiv"),
@NamedQuery(name = "Users.findByDataAdaugarii", query = "SELECT u FROM Users u WHERE u.dataAdaugarii = :dataAdaugarii"),
@NamedQuery(name = "Users.findByNivelAccesID", query = "SELECT u FROM Users u WHERE u.nivelAccesID = :nivelAccesID")})
public class Users implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "userID")
private Integer userID;
@Basic(optional = false)
@Column(name = "userNume")
private String userNume;
@Basic(optional = false)
@Column(name = "numePrenume")
private String numePrenume;
@Basic(optional = false)
@Column(name = "email")
private String email;
@Basic(optional = false)
@Column(name = "parola")
private String parola;
@Basic(optional = false)
@Column(name = "contActiv")
private boolean contActiv;
@Basic(optional = false)
@Column(name = "dataAdaugarii")
@Temporal(TemporalType.TIMESTAMP)
private Date dataAdaugarii;
@Basic(optional = false)
@Column(name = "nivelAccesID")
private short nivelAccesID;
public Users() {
}
public Users(Integer userID) {
this.userID = userID;
}
public Users(Integer userID, String userNume, String numePrenume, String email, String parola, boolean contActiv, Date dataAdaugarii, short nivelAccesID) {
this.userID = userID;
this.userNume = userNume;
this.numePrenume = numePrenume;
this.email = email;
this.parola = parola;
this.contActiv = contActiv;
this.dataAdaugarii = dataAdaugarii;
this.nivelAccesID = nivelAccesID;
}
public Integer getUserID() {
return userID;
}
public void setUserID(Integer userID) {
this.userID = userID;
}
public String getUserNume() {
return userNume;
}
public void setUserNume(String userNume) {
this.userNume = userNume;
}
public String getNumePrenume() {
return numePrenume;
}
public void setNumePrenume(String numePrenume) {
this.numePrenume = numePrenume;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getParola() {
return parola;
}
public void setParola(String parola) {
this.parola = parola;
}
public boolean getContActiv() {
return contActiv;
}
public void setContActiv(boolean contActiv) {
this.contActiv = contActiv;
}
public Date getDataAdaugarii() {
return dataAdaugarii;
}
public void setDataAdaugarii(Date dataAdaugarii) {
this.dataAdaugarii = dataAdaugarii;
}
public short getNivelAccesID() {
return nivelAccesID;
}
public void setNivelAccesID(short nivelAccesID) {
this.nivelAccesID = nivelAccesID;
}
@Override
public int hashCode() {
int hash = 0;
hash += (userID != null ? userID.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Users)) {
return false;
}
Users other = (Users) object;
if ((this.userID == null && other.userID != null) || (this.userID != null && !this.userID.equals(other.userID))) {
return false;
}
return true;
}
@Override
public String toString() {
return "my.servlets.Users[ userID=" + userID + " ]";
}
}
Si j'ai manqué de poster toute autre information s'il vous plaît dites-moi et je le mettrai en ligne.
S'il vous plaît aidez-moi. Manny merci d'avance.