Error Compiling The Query Select
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derby.jar, added eclipselink.jar and javax.persistence.jar from eclipse eclipselink-2.0.0.v20090731-r4765 installtion zip. I have entity class and some usage of this class and got different ind of message when try to use it like: Exception in thread "main" java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager: Exception Description: Error compiling the query [select object(o) from DiscountCode as o]. Unknown entity type [DiscountCode]. /// Caused by: Exception [EclipseLink-8034] (Eclipse Persistence Services - 2.0.0.v20090731-r4765): org.eclipse.persistence.exceptions.JPQLException Exception Description: Error compiling the query [select object(o) from DiscountCode as o]. Unknown entity type [DiscountCode]. /// sometimes (may be with different version of eclipselink I have also message about missed "@Entity annotation" What may be wrong? //////////////////////// my persistence.xml:
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Speaker BureauLog inRegisterSearchSearchCancelError: You don't have JavaScript enabled. This tool uses JavaScript and much of it will not work correctly without it https://community.oracle.com/thread/2047284?start=0 enabled. Please turn JavaScript back on and reload this page. Please enter a title. You can not post a blank message. Please type your message and try again. More discussions in Java Programming All PlacesJavaJava EssentialsJava Programming This discussion is archived 6 Replies Latest reply error compiling on Jan 18, 2010 1:00 PM by 807580 javax.persistence.PersistenceException 807580 Jan 15, 2010 10:53 AM Hi Developers, * I did an simple JPA example with MYSQL5.0 in Eclipse, They are, Database Name : jpaexamples Database Table : student Model Class : Student.java Main Class : compile error in JPASetFirstResult.java Persistence file : persistence.xml * I am getting the following exception while running JPASetFirstResult.java, Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named jpa at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source) at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source) at com.tnq.jpa.JPASetFirstResult.main(JPASetFirstResult.java:16)Student.java package com.tnq.jpa; public class Student { private int id; public int getId() { return id; } public void setId(int id) { this.id = id; } ;.;.;.;. ;.;.;.;. .;.;.;.;JPASetFirstResult.java package com.tnq.jpa; import java.util.Iterator; import java.util.List; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.EntityTransaction; import javax.persistence.Persistence; import javax.persistence.Query; public class JPASetFirstResult { public static void main(String[] args) { EntityManagerFactory emf = Persistence.createEntityManagerFactory("jpa"); EntityManager em = emf.createEntityManager(); try { EntityTransaction entr = em.getTransaction(); entr.begin(); Query query = em.createQuery("SELECT st FROM Student st"); query.setFirstResult(2); List stuList = query.getResultList(); Iterator stuIterator = stuList.iterator(); while (stuIterator.hasNext()) { Student st = (Student) stuIterator.next(); System.out.print("sname:" + st.getSname