Discussion :

[dexter47]

Bonjour,

Je débute avec JPA.

Je reçoit déjà un message d'erreur quand je lancement mon application

J'utilise le serveur MySql pour mes base de données.

Pourriez- vous me données une solution ou des librairies réquises.

Mercie

Code :

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org.apache.catalina.core.StandardWrapperValve invoke
Grave: "Servlet.service()" pour la servlet devcastzone.javaee.JdbcServlet a généré une exception
javax.persistence.PersistenceException: No Persistence provider for EntityManager named PierwszaAplikacja
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:61)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39)
	at devcastzone.javaee.JdbcServlet.doGet(JdbcServlet.java:72)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)

le fichier de persistence:

Code :

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<?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/persistencehttp://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="PierwszaAplikacja" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>devcastzone.javaee.Uzytkownik</class>
<properties>
<property name="hibernate.connection.username" value="root" />
<property name="hibernate.connection.password" value="" />
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.url" value="jdbc:mysql://localhost/szkolenie_javaee? characterEncoding=utf8" />
<property name="hibernate.cache.provider_class" value="org.hibernate.cache.NoCacheProvider" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
</properties>
</persistence-unit>
</persistence>

et l'application

Code :

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package devcastzone.javaee;
 
import java.io.IOException;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Date;
 
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.Statement;
import com.sun.jndi.url.corbaname.corbanameURLContextFactory;
 
/**
 * Servlet implementation class JdbcServlet
 */
@WebServlet("/jdbc")
public class JdbcServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
 
	/**
         * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
         */
	protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
		res.setContentType("text/plain; charset=utf-8");
		res.getWriter().println("JDBC Servlet");
 
 
		EntityManagerFactory emf = Persistence.createEntityManagerFactory("PierwszaAplikacja");
				EntityManager em = emf.createEntityManager();
				Uzytkownik u = em.find(Uzytkownik.class, 1);
				res.getWriter().println(u.getImie() + " " + u.getNazwisko());
				em.close();
				emf.close();
 
	}
 
	/**
         * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
         */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}
 
}

Ficher .war a telecharge:
https://drive.google.com/file/d/0B0Q...it?usp=sharing