MappingException « Annotation « JPA Q&A

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1. Hibernate MappingException Unknown entity: $Proxy2    stackoverflow.com

I'm using Hibernate annotations and have a VERY basic data object: 

import java.io.Serializable;

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


@Entity
public class State implements Serializable {
/**
 * 
 */
private static final long serialVersionUID = 1L;

@Id
private String stateCode;

private String ...

2. org.hibernate.MappingException using annotations    stackoverflow.com

I am using JPA annotations for these two classes: 

@Entity
@RooJavaBean
@RooToString
@RooEntity
@MappedSuperclass
public abstract class BaseEntity {

  @Temporal(TemporalType.TIMESTAMP)
  @DateTimeFormat(style = "S-")
  private Calendar created;

  @Temporal(TemporalType.TIMESTAMP)
  @DateTimeFormat(style = "S-")
  private ...

3. org.hibernate.MappingException: Unknown entity    stackoverflow.com

I'm trying to work through Beginning Hibernate 2nd edition, and I'm stuck trying to put together the simple working example with HSQLDB. When I run ant populateMessages, I get 

[java] org.hibernate.MappingException: Unknown entity: ...

4. org.hibernate.MappingException: Could not determine type for: java.util.Set    stackoverflow.com

Although this question asked many times and I have already used all the suggestion but still I am getting this error. The User.java is 

@Entity
@Table(name = "USER")
public class User implements UserDetails, Serializable {

 ...

5. [ANNOTATIONS] MappingException: Unknown entity    forum.hibernate.org

Newbie Joined: Thu Mar 09, 2006 11:52 am Posts: 13 I'm trying to get annotations to work but when I try to load an annotated class object, I get the exception mentioned below. I guess that my annotations are somewhat wrong but I don't know where the error possibly might be. Hope someone can help, thanks in advance. Hibernate version: 3.1.3 ...