The Department class is displayed but not included in any persistence block.

Question

I get this error, and I have no idea why: the Department class is displayed, but not included in any storage unit.

I have two projects. One of them In my persistence.xml, there are only two lines between the tag:

<persistence-unit name="UserJPA"> </persistence-unit> 

My class:

 package br.com.jm.user; import java.io.Serializable; import javax.persistence.Entity; import javax.persistence.Column; import javax.persistence.Id; import javax.persistence.Table;; @Entity @Table(name = "DEPARTMENT") public class Department implements Serializable { private static final long serialVersionUID = 1L; @Id private Long id; private String name; //getters and setters } 

I am using EclipseLink2.1.2. In fact, I can remove this if it simplifies the situation.

Hugs, Demetrio

Answer 1

For those who find this old question when searching for “The xxxx class is displayed but not included in any unit error” in Eclipse or RAD, the comment of this question and answer has a solution that worked for me:

• Right-click the project and select properties.
• Choose JPA
• Select the "Automatically open annotated classes" radio button
• OK and wait for the project to complete.

These steps worked for me.

Answer 2

You need to specify which classes are included in the persistence block in the persistence.xml file, for example:

 <persistence-unit name="UserJPA"> <class>br.com.jm.user.Department</class> </persistence-unit> 

Answer 3

Right-click the persistance.xml file in the project explorer

then click Sync Class List

it automatically generates your class labels

Answer 4

persistence.xml should have:

 <persistence 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" version="2.0"> <persistence-unit>..</persistence-unit> </persistence>