Program: 66983
Project: 66983
Buggy source:
/** 
 * INTERNAL: Allows for subclasses to convert the attribute value.
 */
public Object getAttributeValue(Object fieldValue,AbstractSession session,XMLRecord record){
  boolean isNullRepresentedByEmptyNode=getNullPolicy().isNullRepresentedByEmptyNode();
  if (XMLConstants.EMPTY_STRING.equals(fieldValue) && isNullRepresentedByEmptyNode) {
    fieldValue=null;
  }
 else   if (null == fieldValue && !isNullRepresentedByEmptyNode) {
    fieldValue=XMLConstants.EMPTY_STRING;
  }
  Object attributeValue=fieldValue;
  if (attributeValue == XMLRecord.noEntry) {
    if (!getNullPolicy().getIsSetPerformedForAbsentNode()) {
      return attributeValue;
    }
 else {
      fieldValue=null;
      attributeValue=null;
    }
  }
  if (hasConverter()) {
    if (getConverter() instanceof XMLConverter) {
      attributeValue=((XMLConverter)getConverter()).convertDataValueToObjectValue(attributeValue,session,record.getUnmarshaller());
    }
 else {
      attributeValue=getConverter().convertDataValueToObjectValue(attributeValue,session);
    }
  }
 else {
    if ((attributeValue == null) || (attributeValue.getClass() != this.attributeObjectClassification)) {
      try {
        attributeValue=session.getDatasourcePlatform().convertObject(attributeValue,this.attributeClassification);
      }
 catch (      ConversionException e) {
        throw ConversionException.couldNotBeConverted(this,getDescriptor(),e);
      }
    }
  }
  if (attributeValue == null) {
    attributeValue=this.nullValue;
  }
  return attributeValue;
}

Fixed version (ground truth):
/** 
 * INTERNAL: Allows for subclasses to convert the attribute value.
 */
public Object getAttributeValue(Object fieldValue,AbstractSession session,XMLRecord record){
  boolean isNullRepresentedByEmptyNode=getNullPolicy().isNullRepresentedByEmptyNode();
  boolean isNullRepresentedByXsiNil=getNullPolicy().isNullRepresentedByXsiNil();
  if (XMLConstants.EMPTY_STRING.equals(fieldValue) && isNullRepresentedByEmptyNode) {
    fieldValue=null;
  }
 else   if (null == fieldValue && !isNullRepresentedByEmptyNode) {
    fieldValue=XMLConstants.EMPTY_STRING;
  }
  Object attributeValue=fieldValue;
  if (attributeValue == XMLRecord.noEntry) {
    if (!getNullPolicy().getIsSetPerformedForAbsentNode()) {
      return attributeValue;
    }
 else {
      fieldValue=null;
      attributeValue=null;
    }
  }
  if (attributeValue == XMLRecord.nil && isNullRepresentedByXsiNil) {
    fieldValue=null;
    attributeValue=null;
  }
  if (hasConverter()) {
    if (getConverter() instanceof XMLConverter) {
      attributeValue=((XMLConverter)getConverter()).convertDataValueToObjectValue(attributeValue,session,record.getUnmarshaller());
    }
 else {
      attributeValue=getConverter().convertDataValueToObjectValue(attributeValue,session);
    }
  }
 else {
    if ((attributeValue == null) || (attributeValue.getClass() != this.attributeObjectClassification)) {
      try {
        attributeValue=session.getDatasourcePlatform().convertObject(attributeValue,this.attributeClassification);
      }
 catch (      ConversionException e) {
        throw ConversionException.couldNotBeConverted(this,getDescriptor(),e);
      }
    }
  }
  if (attributeValue == null) {
    attributeValue=this.nullValue;
  }
  return attributeValue;
}