Java Persistence Issue

问题

I am trying to get a simple example up and running using JPA in an EJB through GlassFish. I have the following persistence.xml

<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="default" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <jta-data-source>jdbc/wms</jta-data-source>
    <class>com.xxx.xxx.datamodel.MyTest</class>
    <exclude-unlisted-classes /> 
    <properties>
      <property name="eclipselink.target-server" value="SunAS9"/>
      <property name="eclipselink.logging.level" value="FINEST"/>
      <property name="eclipselink.target-database" value="Oracle"/>

      <property name="eclipselink.jdbc.driver" value="oracle.jdbc.OracleDriver" />  
        <property name="eclipselink.jdbc.url" value="[dbconnectionstring]" />
        <property name="eclipselink.jdbc.user" value="user" />  
        <property name="eclipselink.jdbc.password" value="password" />  
    </properties>
  </persistence-unit>
</persistence>

A simple entity:

package com.xxx.xxx.datamodel;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "move_task")
public class MyTest {

    private int key;
    private String description;

    @Id
    public int getKey(){
        return key;
    }

    public void setKey(int key){
        this.key = key;
    }

    public String getDescription(){
        return this.description;
    }

    public void setDescription(String description){
        this.description = description;
    }

    @Override
    public String toString(){
        return "Key: " + key + " Description: " + description;
    }

}

And finally the following code to try use the above:

private void jpaCall() {
        try{
            emf = Persistence.createEntityManagerFactory("default");
            em = emf.createEntityManager();
            log.info("JPA init complete");

            final List<MyTest> list = em.createQuery("select p from MyTest p").getResultList();

            for (MyTest current : list) {
                final String description = current.getDescription();
                log.info("JPA: Desc: " + description);
            }

        }
        catch(Exception e){
            log.error("Error on JPA", e);
        }

    }

When this is run as part of my EJB initialisation I get the following error:

java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager: 
Exception Description: Error compiling the query [select p from MyTest p]. Unknown entity type [MyTest].
...
Caused by: Exception [EclipseLink-8034] (Eclipse Persistence Services - 2.0.0.v20091127-r5931): org.eclipse.persistence.exceptions.JPQLException
Exception Description: Error compiling the query [select p from MyTest p]. Unknown entity type [MyTest].

I am not sure what I am doing wrong and would appreciate any help.

Cheers,

James

回答1:

So as the comments above suggest this seems to be an issue with the eclipse plug in for glassfish. I am having no problems when deploying the ear manually.

Thanks all for the help.

James

来源：https://stackoverflow.com/questions/2252115/java-persistence-issue