[eclipselink-users] java.lang.ClassCastException: java.lang.Boolean cann

[Warren Tang <warren.c.tang@xxxxxxxxx>]

Hi everyone,

I've just began to learn EclipseLink. I've got into trouble on a sample built with JPA and Derby. When calling entitymanager.persist and then committing, an error is thrown:

Rollback Exception [cause = java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.Short]

The problem seems to be the Boolean type. If I change it to Short the error goes away. But cannot I use Boolean type? Isn't EclipseLink supposed to do the conversion for me? Or is there some special syntax to do it?

The entity class is as follows:

@Entity
@NamedQuery(name = "findAllBooks", query="select b from Book b")
public class Book {
  @Id @GeneratedValue
  private Long id;
  @Column(nullable = false)
  private String title;
  private Float price;
  @Column(length = 2000)
  private String description;
  private String isbn;
  private Integer nbOfPage;
  private Boolean illustrations;

  //getters/setters omitted.
}

The sample is compiled against Java 1.6 and the dependencies defined in pom.xml are as follows:

<dependencies>
    <!-- JPA interface -->
    <dependency>
      <groupId>org.eclipse.persistence</groupId>
      <artifactId>javax.persistence</artifactId>
      <version>2.0.0</version>
    </dependency>
    <!-- Persistence provider -->
    <dependency>
      <groupId>org.eclipse.persistence</groupId>
      <artifactId>eclipselink</artifactId>
      <version>2.0.0</version>
    </dependency>
    <!-- Derby JDBC driver -->
    <dependency>
      <groupId>org.apache.derby</groupId>
      <artifactId>derbyclient</artifactId>
      <version>10.8.1.2</version>
    </dependency>
    <!-- Derby embedded jar -->
    <dependency>
      <groupId>org.apache.derby</groupId>
      <artifactId>derby</artifactId>
      <version>10.8.1.2</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.9</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

--
Regards,
Warren Tang