[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - Re: no persistent classes found for query class

[dgeraskov]

I created the simplest jpa project. With only 1 entity.
package model;

import javax.persistence.*;
  | 
  | @Entity
  | public class Article implements java.io.Serializable {		
  | 		
  | 	@Id
  | 	@GeneratedValue(strategy = GenerationType.AUTO)
  | 	private Short id_Article;	
  | 	
  | 	@Column(name="ar_name")
  | 	private String arName;
  | 
  | 	public Article() {}
  | 
  | 	public Article(short idArticle, String arName) {
  | 		this.id_Article = idArticle;
  | 		this.arName = arName;
  | 	}	
  | 	...get/set
  | }


package model;
  | 
  | import java.util.List;
  | import javax.persistence.*;
  | 
  | public class R {
  | 
  | 	/**
  | 	 * @param args
  | 	 */
  | 	public static void main(String[] args) {
  | 		EntityManagerFactory emf =
  | 			Persistence.createEntityManagerFactory("article_jpa");
  | 		
  | 		// First unit of work
  | 		EntityManager em = emf.createEntityManager();
  | 		EntityTransaction tx = em.getTransaction();
  | 		tx.begin();
  | 		Query max = em.createQuery("from Article a");
  | 		//max.setMaxResults(1);
  | 		List l = max.getResultList();
  | 		for (int i = 0; i < l.size(); i++) {
  | 			Article ar = (Article) l.get(i);
  | 			System.out.println(ar.getIdArticle() + "\t" + ar.getArName());
  | 		}
  | 		if (l.size() == 0){
  | 			for (short i = 1; i < 10; i++){
  | 				Article article = new Article(i, "Article №" + i);
  | 				em.persist(article);
  | 			}			
  | 		}
  | 		tx.commit();
  | 		em.close();
  | 		
  | 		emf.close();
  | 		System.out.println("finish");
  | 	}
  | }

and persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
  | <persistence version="1.0" 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_1_0.xsd">
  | 	<persistence-unit name="article_jpa">
  | 		<class>model.Article</class>
  | 		<exclude-unlisted-classes>true</exclude-unlisted-classes>
  | 		<properties>
  | 			<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
  | 			<property name="hibernate.connection.driver_class" value="org.postgresql.Driver"/>
  | 			<property name="hibernate.connection.url" value="jdbc:postgresql:test"/>
  | 			<property name="hibernate.connection.username" value="postgres"/>
  | 			<property name="hibernate.connection.password" value="postgres"/>
  | 
  | 			<property name="hibernate.current_session_context_class"
  | 					value="org.hibernate.context.JTASessionContext"/>			
  | 		</properties>
  | 	</persistence-unit>
  | </persistence>

Database table has only 2 columns: id_article and ar_name.
You can use this example as starting point. Change connection settings to your database, create table Article and see how it works.

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