Gunnar,
Thanks for your prompt feedback
The problem is caused by a class that extends another one and the Comparable interface. The child class again declares implements Comparable<ReferenceData>. The implements Comparable<ReferenceData> was not required in the child class but is this what was causing the error.
The method was when processing the compareTo method
-- Parent class
/**
* Reference data base class.
*
* @author Robert Nagajek
*/
@MappedSuperclass
@NoArgsConstructor
@Getter
@Setter
public abstract class ReferenceData extends Base implements Serializable, Comparable<ReferenceData>, Activatable {
@Basic(optional = false)
@NotBlank
@Size(max = 1000)
private String name;
@Lob
private byte[] icon;
@Basic(optional = false)
private boolean active = true;
public ReferenceData(Long id) {
super(id);
}
@Override
public int compareTo(ReferenceData other) {
return Nvl.nvl(getName()).compareToIgnoreCase(Nvl.nvl(other.getName()));
}
}
-- Child class
/**
* Sorted reference data base class.
*
* @author Robert Nagajek <robert@anahata-it.com.au>
*/
@MappedSuperclass
@NoArgsConstructor
@Getter
@Setter
public class SortedReferenceData extends ReferenceData implements Serializable, Comparable<ReferenceData> {
@NotNull
private Integer sortOrder;
public SortedReferenceData(Long id) {
super(id);
}
@Override
public int compareTo(ReferenceData other) {
return sortOrder - ((SortedReferenceData)other).sortOrder;
}
}
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