Program: 91650
Project: 91650
Buggy source:
/** 
 * Constructs a new instance initialized with the values from the specified metadata object. This is a <cite>shallow</cite> copy constructor, since the other metadata contained in the given object are not recursively copied.
 * @param object  the metadata to copy values from, or {@code null} if none.
 * @see #castOrCopy(Metadata)
 */
public DefaultMetadata(final Metadata object){
  super(object);
  if (object != null) {
    metadataIdentifier=object.getMetadataIdentifier();
    parentMetadata=object.getParentMetadata();
    languages=copyCollection(object.getLanguages(),Locale.class);
    characterSets=copyCollection(object.getCharacterSets(),Charset.class);
    metadataScopes=copyCollection(object.getMetadataScopes(),MetadataScope.class);
    contacts=copyCollection(object.getContacts(),Responsibility.class);
    dateInfo=copyCollection(object.getDateInfo(),CitationDate.class);
    metadataStandards=copyCollection(object.getMetadataStandards(),Citation.class);
    metadataProfiles=copyCollection(object.getMetadataProfiles(),Citation.class);
    alternativeMetadataReferences=copyCollection(object.getAlternativeMetadataReferences(),Citation.class);
    metadataLinkages=copyCollection(object.getMetadataLinkages(),OnlineResource.class);
    spatialRepresentationInfo=copyCollection(object.getSpatialRepresentationInfo(),SpatialRepresentation.class);
    referenceSystemInfo=copyCollection(object.getReferenceSystemInfo(),ReferenceSystem.class);
    metadataExtensionInfo=copyCollection(object.getMetadataExtensionInfo(),MetadataExtensionInformation.class);
    identificationInfo=copyCollection(object.getIdentificationInfo(),Identification.class);
    contentInfo=copyCollection(object.getContentInfo(),ContentInformation.class);
    distributionInfo=copyCollection(object.getDistributionInfo(),Distribution.class);
    dataQualityInfo=copyCollection(object.getDataQualityInfo(),DataQuality.class);
    portrayalCatalogueInfo=copyCollection(object.getPortrayalCatalogueInfo(),PortrayalCatalogueReference.class);
    metadataConstraints=copyCollection(object.getMetadataConstraints(),Constraints.class);
    applicationSchemaInfo=copyCollection(object.getApplicationSchemaInfo(),ApplicationSchemaInformation.class);
    metadataMaintenance=object.getMetadataMaintenance();
    acquisitionInformation=copyCollection(object.getAcquisitionInformation(),AcquisitionInformation.class);
    resourceLineages=copyCollection(object.getResourceLineages(),Lineage.class);
  }
}

Fixed version (ground truth):
/** 
 * Constructs a new instance initialized with the values from the specified metadata object. This is a <cite>shallow</cite> copy constructor, since the other metadata contained in the given object are not recursively copied.
 * @param object  the metadata to copy values from, or {@code null} if none.
 * @see #castOrCopy(Metadata)
 */
public DefaultMetadata(final Metadata object){
  super(object);
  if (object != null) {
    identifiers=singleton(object.getMetadataIdentifier(),Identifier.class);
    parentMetadata=object.getParentMetadata();
    languages=copyCollection(object.getLanguages(),Locale.class);
    characterSets=copyCollection(object.getCharacterSets(),Charset.class);
    metadataScopes=copyCollection(object.getMetadataScopes(),MetadataScope.class);
    contacts=copyCollection(object.getContacts(),Responsibility.class);
    dateInfo=copyCollection(object.getDateInfo(),CitationDate.class);
    metadataStandards=copyCollection(object.getMetadataStandards(),Citation.class);
    metadataProfiles=copyCollection(object.getMetadataProfiles(),Citation.class);
    alternativeMetadataReferences=copyCollection(object.getAlternativeMetadataReferences(),Citation.class);
    metadataLinkages=copyCollection(object.getMetadataLinkages(),OnlineResource.class);
    spatialRepresentationInfo=copyCollection(object.getSpatialRepresentationInfo(),SpatialRepresentation.class);
    referenceSystemInfo=copyCollection(object.getReferenceSystemInfo(),ReferenceSystem.class);
    metadataExtensionInfo=copyCollection(object.getMetadataExtensionInfo(),MetadataExtensionInformation.class);
    identificationInfo=copyCollection(object.getIdentificationInfo(),Identification.class);
    contentInfo=copyCollection(object.getContentInfo(),ContentInformation.class);
    distributionInfo=copyCollection(object.getDistributionInfo(),Distribution.class);
    dataQualityInfo=copyCollection(object.getDataQualityInfo(),DataQuality.class);
    portrayalCatalogueInfo=copyCollection(object.getPortrayalCatalogueInfo(),PortrayalCatalogueReference.class);
    metadataConstraints=copyCollection(object.getMetadataConstraints(),Constraints.class);
    applicationSchemaInfo=copyCollection(object.getApplicationSchemaInfo(),ApplicationSchemaInformation.class);
    metadataMaintenance=object.getMetadataMaintenance();
    acquisitionInformation=copyCollection(object.getAcquisitionInformation(),AcquisitionInformation.class);
    resourceLineages=copyCollection(object.getResourceLineages(),Lineage.class);
  }
}