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Does aggregate function "greatest" work on entity objects?

#1

Does aggregate function "greatest" work on entity objects?

do not come to the function "compareTo"

@Entity
public class ChatHistoryItem extends AbstractObject implements Comparable {
    private static final long serialVersionUID = 1L;

    @Override
    public int compareTo(Object t) {
        //Logger.getLogger("------------").log(Level.INFO, this.toString() + " compareTo " + t.toString() + " result = " +
        int result = ((int)(this.getCreateDate().getTime() - ((ChatHistoryItem)t).getCreateDate().getTime()));
        //Logger.getLogger("------------").log(Level.INFO, this.toString() + " compareTo " + t.toString() + " result = " + result);
        return result;
    }
   
    @Column(length=1024)
    private String text;
   
    @Embedded
    private PersonData sender;
   
    @Embedded
    private PersonData recipient;
   
    @ElementCollection(targetClass = ChatAttachment.class, fetch = FetchType.EAGER)
    private List<ChatAttachment> attachments;
   
    private boolean isSystem;
   
    private boolean isViewed;
   
    private boolean isPriority;
  
    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public PersonData getSender() {
        return sender;
    }

    public void setSender(PersonData sender) {
        this.sender = sender;
    }

    public PersonData getRecipient() {
        return recipient;
    }

    public void setRecipient(PersonData recipient) {
        this.recipient = recipient;
    }
   

    public List<ChatAttachment> getAttachments() {
        return attachments;
    }

    public void setAttachments(List<ChatAttachment> attachments) {
        this.attachments = attachments;
    }

    public boolean getIsSystem() {
        return isSystem;
    }

    public void setIsSystem(boolean isSystem) {
        this.isSystem = isSystem;
    }

    public boolean getIsViewed() {
        return isViewed;
    }

    public void setIsViewed(boolean isViewed) {
        this.isViewed = isViewed;
    }

    public boolean isIsPriority() {
        return isPriority;
    }

    public void setIsPriority(boolean isPriority) {
        this.isPriority = isPriority;
    }

   
   
    @Override
    public String toString() {
        return "granat.dp.domain.entity.DialogItem[ id=" + getId() + " ]";
    }
 
}

Thanks for your help.

#2

Entity objects are not comparable in queries.

See the list of Comparable Data Types in the manual.

ObjectDB Support
ObjectDB - Fast Object Database for Java (JPA/JDO)

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