Correct DuplicateNodeException thrown when destination of copy already

import it.inaf.ia2.aa.data.User;

import it.inaf.oats.vospace.datamodel.NodeUtils;

import it.inaf.oats.vospace.exception.DuplicateNodeException;

import it.inaf.oats.vospace.exception.NodeBusyException;

import it.inaf.oats.vospace.exception.NodeNotFoundException;

import it.inaf.oats.vospace.exception.PermissionDeniedException;

import java.util.Optional;

import net.ivoa.xml.vospace.v2.Transfer;

import org.springframework.dao.CannotSerializeTransactionException;

import org.springframework.dao.DuplicateKeyException;

import org.springframework.stereotype.Service;

import org.springframework.transaction.annotation.EnableTransactionManagement;

import org.springframework.transaction.annotation.Isolation;

        } catch (CannotSerializeTransactionException ex) {

            // Concurrent transactions attempted to modify this set of nodes            

            throw new NodeBusyException(sourcePath);

        } catch (DuplicateKeyException ex) {

            throw new DuplicateNodeException(destinationCopyRoot);

        }

        return List.of(sourcePath, destinationCopyRoot);