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<p style="margin: 10px 0 0 0">Gunnar,</p>
<p style="margin: 10px 0 0 0">Thanks for your prompt feedback</p>
<p style="margin: 10px 0 0 0">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.</p>
<p style="margin: 10px 0 0 0">– Parent class</p>
<p style="margin: 10px 0 0 0">/**</p>
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Reference data base class.
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@author Robert Nagajek<br /> */<br /> @MappedSuperclass<br /> @NoArgsConstructor<br /> @Getter<br /> @Setter<br /> public abstract class ReferenceData extends Base implements Serializable, Comparable<ReferenceData>, Activatable {<br /> @Basic(optional = false)<br /> @NotBlank<br /> @Size(max = 1000)<br /> private String name;
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<p style="margin: 10px 0 0 0"> @Lob<br /> private byte[] icon;</p>
<p style="margin: 10px 0 0 0"> @Basic(optional = false)<br /> private boolean active = true;</p>
<p style="margin: 10px 0 0 0"> public ReferenceData(Long id) </p> { super(id); }<br /> <br /> @Override<br /> public int compareTo(ReferenceData other) { return Nvl.nvl(getName()).compareToIgnoreCase(Nvl.nvl(other.getName())); }<br /> }<br /> <br /> – Child class<br /> <br /> /**<br /> * Sorted reference data base class.<br /> *<br /> * @author Robert Nagajek <robert@anahata-it.com.au><br /> */<br /> @MappedSuperclass<br /> @NoArgsConstructor<br /> @Getter<br /> @Setter<br /> public class SortedReferenceData extends ReferenceData implements Serializable, Comparable<ReferenceData> {<br /> @NotNull<br /> private Integer sortOrder;<br /> <br /> public SortedReferenceData(Long id) { super(id); }
<p style="margin: 10px 0 0 0"> @Override<br /> public int compareTo(ReferenceData other) </p> { return sortOrder - ((SortedReferenceData)other).sortOrder; }
<p style="margin: 10px 0 0 0">}</p>
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