EDIT

import eu.etaxonomy.cdm.model.media.Media;

import eu.etaxonomy.cdm.model.name.SpecimenTypeDesignation;

import eu.etaxonomy.cdm.model.occurrence.DerivationEvent;

    private DerivedUnit source;

        this.source = HibernateProxyHelper.deproxy(derivedUnit, DerivedUnit.class);

     * converts the <code>source</code> <code>DerivedUnit</code> this converter has been created for into a <code>DerivedUnit</code> of the type <code>TARGET</code>.

     * If the <code>source</code> instance was persisted the target instance will also be written into data base and the source is deleted from there.

     *

        if(source.getClass().equals(targetType)){

            return (TARGET) source;

                            source.toString(),

        if(source.getId() > 0){

            service.merge(newInstance);

            service.delete(source);

        }

        n.setAccessionNumber(source.getAccessionNumber());

        n.setBarcode(source.getBarcode());

        n.setCatalogNumber(source.getCatalogNumber());

        n.setCollection(source.getCollection());

        DerivationEvent derivationEvent = source.getDerivedFrom();

        derivationEvent.getDerivatives().remove(source);

        n.setDerivedFrom(source.getDerivedFrom());

        source.setDerivedFrom(null);

        n.setExsiccatum(source.getExsiccatum());

        n.setIndividualCount(source.getIndividualCount());

        n.setKindOfUnit(source.getKindOfUnit());

        n.setLifeStage(source.getLifeStage());

        n.setLsid(source.getLsid());

        n.setOriginalLabelInfo(source.getOriginalLabelInfo());

        n.setPreferredStableUri(source.getPreferredStableUri());

        n.setPreservation(source.getPreservation());

        n.setPublish(source.isPublish());

        n.setProtectedIdentityCache(source.isProtectedIdentityCache());

        n.setProtectedTitleCache(source.isProtectedTitleCache());

        // n.setRecordBasis(source.getRecordBasis()); // not to copy, this it is set for the new instance explicitly

        n.setSex(source.getSex());

        n.setStoredUnder(source.getStoredUnder());

        n.setTitleCache(source.getTitleCache(), n.isProtectedTitleCache());

        source.getSources().forEach(s -> n.addSource(s));

        source.getAnnotations().forEach(a -> n.addAnnotation(a));

        source.getCredits().forEach(c -> n.addCredit(c));

        source.getDerivationEvents().forEach(de -> n.addDerivationEvent(de));

        source.getDerivationEvents().clear();

        source.getDescriptions().forEach(d -> n.addDescription(d));

        source.getDeterminations().forEach(det -> n.addDetermination(det));

        source.getDeterminations().clear();

        source.getExtensions().forEach(e -> n.addExtension(e));

        source.getIdentifiers().forEach(i -> n.addIdentifier(i));

        source.getMarkers().forEach(m -> n.addMarker(m));

        source.getRights().forEach(r -> n.addRights(r));

        n.addSources(source.getSources());

        for(SpecimenTypeDesignation std :  source.getSpecimenTypeDesignations()) {

            std.setTypeSpecimen(n);

            n.addSpecimenTypeDesignation(std);

         }

        source.getSpecimenTypeDesignations().clear();

        if(source.getClass().equals(DerivedUnit.class)) {

        if(source.getClass().equals(MediaSpecimen.class)){

            MediaSpecimen ms = (MediaSpecimen)source;

            Media media = ms.getMediaSpecimen();

            return media == null;

import java.util.Arrays;

import java.util.UUID;

import org.hibernate.SessionFactory;

import eu.etaxonomy.cdm.model.occurrence.FieldUnit;

    @SpringBeanByType

    SessionFactory sessionFactory;

    /**

     * Test with DerivedUnit which is used in a couple of associations to prevent from

     * org.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade ...

     */

    @DataSet("DerivedUnitConverterIntegrationTest.cascadeDelete.xml")

    @Test

    public void cascadeDelete() throws DerivedUnitConversionException{

        // NOTE:

        // normally we would run this test as CdmIntegrationTest, but due to bug #7138

        // this is not possible, so we use CdmTransactionalIntegrationTest as super class

        // and stop the transaction at the beginning of the test

        commit();

        UUID uuid = UUID.fromString("10eceb2c-9b51-458e-8dcd-2cb92cc558a9");

        MediaSpecimen du = (MediaSpecimen) service.load(uuid, Arrays.asList(new String[]{"*",

                "derivedFrom.*",

                "derivedFrom.originals.*",

                "derivedFrom.originals.derivationEvents",

                "specimenTypeDesignations.typifiedNames.typeDesignations",

                //

                "derivedFrom.originals.gatheringEvent.$",

                "derivedFrom.originals.gatheringEvent.country",

                "derivedFrom.originals.gatheringEvent.collectingAreas",

                "derivedFrom.originals.gatheringEvent.actor.teamMembers",

                "derivedFrom.originals.derivationEvents.derivatives" }));

        DerivedUnitConverter<DerivedUnit> duc = DerivedUnitConverterFactory.createDerivedUnitConverter(du, DerivedUnit.class);

        DerivedUnit target = duc.convertTo(DerivedUnit.class, SpecimenOrObservationType.HumanObservation);

        //service.save(target); // save is performed in convertTo()

        assertEquals(2, service.list(null, null, null, null, null).size());

        assertEquals(1, service.list(DerivedUnit.class, null, null, null, null).size());

        assertEquals(1, service.list(FieldUnit.class, null, null, null, null).size());

    }

<?xml version='1.0' encoding='UTF-8'?>

<dataset>

  <TAXONNAME ID="5000" CREATED="2017-11-23 15:32:58.0" UUID="47d9263e-b32a-42af-98ea-5528f154384f" UPDATED="[null]" NAMETYPE="ICNAFP" LSID_AUTHORITY="[null]" LSID_LSID="[null]" LSID_NAMESPACE="[null]" LSID_OBJECT="[null]" LSID_REVISION="[null]" PROTECTEDTITLECACHE="false" TITLECACHE="Planothidium victori" APPENDEDPHRASE="[null]" FULLTITLECACHE="Planothidium victori in - undefined journal -: 11-45" NOMENCLATURALMICROREFERENCE="11-45" PARSINGPROBLEM="0" PROBLEMENDS="-1" PROBLEMSTARTS="-1" PROTECTEDFULLTITLECACHE="false" AUTHORSHIPCACHE="" BINOMHYBRID="false" GENUSORUNINOMIAL="Planothidium" HYBRIDFORMULA="false" INFRAGENERICEPITHET="[null]" INFRASPECIFICEPITHET="[null]" MONOMHYBRID="false" NAMECACHE="Planothidium victori" PROTECTEDAUTHORSHIPCACHE="false" PROTECTEDNAMECACHE="false" SPECIFICEPITHET="victori" TRINOMHYBRID="false" NAMEAPPROBATION="[null]" SUBGENUSAUTHORSHIP="[null]" ANAMORPHIC="false" CULTIVARNAME="[null]" ACRONYM="[null]" BREED="[null]" ORIGINALPUBLICATIONYEAR="[null]" PUBLICATIONYEAR="[null]" CREATEDBY_ID="[null]" UPDATEDBY_ID="[null]" HOMOTYPICALGROUP_ID="5000" NOMENCLATURALREFERENCE_ID="5000" RANK_ID="765" BASIONYMAUTHORSHIP_ID="[null]" COMBINATIONAUTHORSHIP_ID="[null]" EXBASIONYMAUTHORSHIP_ID="[null]" EXCOMBINATIONAUTHORSHIP_ID="[null]"/>

  <REFERENCE ID="5000" CREATED="2017-11-23 15:32:58.0" UUID="45804c65-7df9-42fd-b43a-818a8958c264" UPDATED="2017-11-23 15:32:58.33" LSID_AUTHORITY="[null]" LSID_LSID="[null]" LSID_NAMESPACE="[null]" LSID_OBJECT="[null]" LSID_REVISION="[null]" PROTECTEDTITLECACHE="false" TITLECACHE="Novis, Braidwood &amp; Kilroy, P.M. Novis, J. Braidwood &amp; C. Kilroy, Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species in Phytotaxa 64 in - undefined journal -" DATEPUBLISHED_END="[null]" DATEPUBLISHED_FREETEXT="[null]" DATEPUBLISHED_START="[null]" EDITION="[null]" EDITOR="[null]" ISBN="[null]" ISSN="[null]" DOI="[null]" NOMENCLATURALLYRELEVANT="false" ORGANIZATION="[null]" PAGES="[null]" PARSINGPROBLEM="0" PLACEPUBLISHED="[null]" PROBLEMENDS="-1" PROBLEMSTARTS="-1" PUBLISHER="[null]" REFERENCEABSTRACT="[null]" SERIESPART="[null]" TITLE="P.M. Novis, J. Braidwood &amp; C. Kilroy, Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species in Phytotaxa 64" ABBREVTITLE="[null]" ABBREVTITLECACHE="Novis, Braidwood &amp; Kilroy, P.M. Novis, J. Braidwood &amp; C. Kilroy, Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species in Phytotaxa 64 in - undefined journal -" PROTECTEDABBREVTITLECACHE="false" REFTYPE="ART" URI="[null]" VOLUME="[null]" ACCESSED="[null]" LASTRETRIEVED="[null]" EXTERNALID="[null]" EXTERNALLINK="[null]" AUTHORITYTYPE="[null]" CREATEDBY_ID="[null]" UPDATEDBY_ID="[null]" AUTHORSHIP_ID="5000" INREFERENCE_ID="[null]" INSTITUTION_ID="[null]" SCHOOL_ID="[null]"/>

  <AGENTBASE DTYPE="Team" ID="5000" CREATED="2017-11-23 15:32:58.0" UUID="05555fcb-72bf-49d0-9677-4de87f13e9ed" UPDATED="[null]" LSID_AUTHORITY="[null]" LSID_LSID="[null]" LSID_NAMESPACE="[null]" LSID_OBJECT="[null]" LSID_REVISION="[null]" PROTECTEDTITLECACHE="true" TITLECACHE="Novis, Braidwood &amp; Kilroy" PROTECTEDCOLLECTORTITLECACHE="false" COLLECTORTITLE="[null]" PROTECTEDNOMENCLATURALTITLECACHE="true" NOMENCLATURALTITLE="Novis, Braidwood &amp; Kilroy" CODE="[null]" NAME="[null]" FIRSTNAME="[null]" INITIALS="[null]" LASTNAME="[null]" LIFESPAN_END="[null]" LIFESPAN_FREETEXT="[null]" LIFESPAN_START="[null]" PREFIX="[null]" SUFFIX="[null]" HASMOREMEMBERS="false" CREATEDBY_ID="[null]" UPDATEDBY_ID="[null]" ISPARTOF_ID="[null]"/>

  <HOMOTYPICALGROUP ID="5000" CREATED="2017-11-23 15:32:58.0" UUID="042ac145-cf9f-47c2-b4a1-8a4350e234eb" UPDATED="[null]" CREATEDBY_ID="[null]" UPDATEDBY_ID="[null]"/>

  <DERIVATIONEVENT ID="5000" CREATED="2017-11-24 16:26:03.0" UUID="42610c79-b50f-4d86-94e6-9f775266f6e5" UPDATED="[null]" DESCRIPTION="[null]" TIMEPERIOD_END="[null]" TIMEPERIOD_FREETEXT="[null]" TIMEPERIOD_START="[null]" CREATEDBY_ID="[null]" UPDATEDBY_ID="[null]" ACTOR_ID="[null]" INSTITUTION_ID="[null]" TYPE_ID="1998"/>

  <GATHERINGEVENT ID="5000" CREATED="2017-11-24 16:26:03.0" UUID="23d40440-38bb-46c1-af11-6e25dcfa0145" UPDATED="[null]" DESCRIPTION="[null]" TIMEPERIOD_END="[null]" TIMEPERIOD_FREETEXT="[null]" TIMEPERIOD_START="[null]" ABSOLUTEELEVATION="[null]" ABSOLUTEELEVATIONMAX="[null]" ABSOLUTEELEVATIONTEXT="[null]" COLLECTINGMETHOD="[null]" DISTANCETOGROUND="[null]" DISTANCETOGROUNDMAX="[null]" DISTANCETOGROUNDTEXT="[null]" DISTANCETOWATERSURFACE="[null]" DISTANCETOWATERSURFACEMAX="[null]" DISTANCETOWATERSURFACETEXT="[null]" EXACTLOCATION_ERRORRADIUS="[null]" EXACTLOCATION_LATITUDE="[null]" EXACTLOCATION_LONGITUDE="[null]" CREATEDBY_ID="[null]" UPDATEDBY_ID="[null]" ACTOR_ID="[null]" COUNTRY_ID="[null]" EXACTLOCATION_REFERENCESYSTEM_ID="[null]" LOCALITY_ID="5000"/>

  <LANGUAGESTRING ID="5000" CREATED="2017-11-24 16:26:03.0" UUID="c63419cd-445c-4086-a03a-c2d200ad6fe5" UPDATED="[null]" TEXT="Somewhere" CREATEDBY_ID="[null]" UPDATEDBY_ID="[null]" LANGUAGE_ID="406"/>

  <SPECIMENOROBSERVATIONBASE DTYPE="FieldUnit" ID="5001" CREATED="2017-11-24 16:26:03.0" UUID="22be718a-6f21-4b74-aae3-bb7d7d659e1c" UPDATED="2017-11-24 16:26:04.307" RECORDBASIS="FU" LSID_AUTHORITY="[null]" LSID_LSID="[null]" LSID_NAMESPACE="[null]" LSID_OBJECT="[null]" LSID_REVISION="[null]" PROTECTEDTITLECACHE="false" TITLECACHE="Somewhere, FieldNumber." PROTECTEDIDENTITYCACHE="false" IDENTITYCACHE="[null]" PUBLISH="true" INDIVIDUALCOUNT="[null]" PREFERREDSTABLEURI="[null]" ACCESSIONNUMBER="[null]" BARCODE="[null]" CATALOGNUMBER="[null]" COLLECTORSNUMBER="[null]" EXSICCATUM="[null]" ORIGINALLABELINFO="[null]" FIELDNOTES="FieldNotes" FIELDNUMBER="FieldNumber" CREATEDBY_ID="[null]" UPDATEDBY_ID="[null]" LIFESTAGE_ID="[null]" SEX_ID="[null]" KINDOFUNIT_ID="[null]" COLLECTION_ID="[null]" DERIVEDFROM_ID="[null]" STOREDUNDER_ID="[null]" PRESERVATION_ID="[null]" GATHERINGEVENT_ID="5000" PRIMARYCOLLECTOR_ID="[null]" MEDIASPECIMEN_ID="[null]" DNAQUALITY_ID="[null]"/>

  <SPECIMENOROBSERVATIONBASE DTYPE="MediaSpecimen" ID="5002" CREATED="2017-11-24 16:26:04.0" UUID="10eceb2c-9b51-458e-8dcd-2cb92cc558a9" UPDATED="2017-11-24 16:26:04.308" RECORDBASIS="SI" LSID_AUTHORITY="[null]" LSID_LSID="[null]" LSID_NAMESPACE="[null]" LSID_OBJECT="[null]" LSID_REVISION="[null]" PROTECTEDTITLECACHE="false" TITLECACHE="Somewhere, FieldNumber (TEST_1)." PROTECTEDIDENTITYCACHE="false" IDENTITYCACHE="[null]" PUBLISH="true" INDIVIDUALCOUNT="[null]" PREFERREDSTABLEURI="[null]" ACCESSIONNUMBER="TEST_1" BARCODE="[null]" CATALOGNUMBER="[null]" COLLECTORSNUMBER="[null]" EXSICCATUM="[null]" ORIGINALLABELINFO="[null]" FIELDNOTES="[null]" FIELDNUMBER="[null]" CREATEDBY_ID="[null]" UPDATEDBY_ID="[null]" LIFESTAGE_ID="[null]" SEX_ID="[null]" KINDOFUNIT_ID="[null]" COLLECTION_ID="[null]" DERIVEDFROM_ID="5000" STOREDUNDER_ID="[null]" PRESERVATION_ID="[null]" GATHERINGEVENT_ID="[null]" PRIMARYCOLLECTOR_ID="[null]" MEDIASPECIMEN_ID="[null]" DNAQUALITY_ID="[null]"/>

  <TYPEDESIGNATIONBASE DTYPE="SpecimenTypeDesignation" ID="5000" CREATED="2017-11-24 16:26:03.0" UUID="a1896ae2-4396-4243-988e-3d74058b44ab" UPDATED="[null]" CITATIONMICROREFERENCE="[null]" ORIGINALNAMESTRING="[null]" NOTDESIGNATED="false" CONSERVEDTYPE="[null]" REJECTEDTYPE="[null]" CREATEDBY_ID="[null]" UPDATEDBY_ID="[null]" CITATION_ID="5000" TYPESTATUS_ID="821" TYPENAME_ID="[null]" TYPESPECIMEN_ID="5002"/>

  <TAXONNAME_TYPEDESIGNATIONBASE TAXONNAME_ID="5000" TYPEDESIGNATIONS_ID="5000"/>

  <SPECIMENOROBSERVATIONBASE_DERIVATIONEVENT ORIGINALS_ID="5001" DERIVATIONEVENTS_ID="5000"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="AgentBase" NEXT_VAL="5001"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="AuditEvent" NEXT_VAL="5007"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="CdmMetaData" NEXT_VAL="5010"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="DefinedTermBase" NEXT_VAL="7193"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="DerivationEvent" NEXT_VAL="5002"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="GatheringEvent" NEXT_VAL="5001"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="GrantedAuthorityImpl" NEXT_VAL="5034"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="HomotypicalGroup" NEXT_VAL="5001"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="LanguageString" NEXT_VAL="5001"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="Media" NEXT_VAL="5001"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="MediaRepresentation" NEXT_VAL="5001"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="MediaRepresentationPart" NEXT_VAL="5001"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="PermissionGroup" NEXT_VAL="5010"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="Reference" NEXT_VAL="5001"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="Representation" NEXT_VAL="7297"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="SpecimenOrObservationBase" NEXT_VAL="5004"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="TaxonName" NEXT_VAL="5001"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="TermVocabulary" NEXT_VAL="5045"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="TypeDesignationBase" NEXT_VAL="5002"/>

  <HIBERNATE_SEQUENCES SEQUENCE_NAME="UserAccount" NEXT_VAL="5002"/>

</dataset>