Program: 13141
Project: 13141
Buggy source:
/** 
 * Expands the provided resource represented by a   {@link JsonValue} relationship object.  A read request  will be issued for the resource identified by the "_ref" field in the supplied relationship object. A supplied  {@link List} of fields indicates which fields to read and then merge with the relationship object.
 * @param context the {@link Context} of the request
 * @param value the value of the relationship object
 * @param fieldsList the list of fields to read and merge with the relationship object.
 * @throws ResourceException if an error is encountered.
 */
private void expandResource(Context context,final JsonValue value,List<JsonPointer> fieldsList) throws ResourceException {
  if (!value.isNull() && value.get(SchemaField.FIELD_REFERENCE) != null) {
    ReadRequest request=Requests.newReadRequest(value.get(SchemaField.FIELD_REFERENCE).asString());
    request.addField(fieldsList.toArray(new JsonPointer[fieldsList.size()]));
    connectionFactory.getConnection().readAsync(context,request).thenOnResultOrException(new ResultHandler<ResourceResponse>(){
      @Override public void handleResult(      ResourceResponse resource){
        value.asMap().putAll(resource.getContent().asMap());
      }
    }
,new ExceptionHandler<ResourceException>(){
      @Override public void handleException(      ResourceException exception){
        Map<String,Object> valueMap=value.asMap();
        valueMap.put(RelationshipUtil.REFERENCE_ERROR,true);
        valueMap.put(RelationshipUtil.REFERENCE_ERROR_MESSAGE,exception.getMessage());
      }
    }
);
  }
 else {
    logger.warn("String_Node_Str");
  }
}

Fixed version (ground truth):
/** 
 * Expands the provided resource represented by a   {@link JsonValue} relationship object.  A read request  will be issued for the resource identified by the "_ref" field in the supplied relationship object. A supplied  {@link List} of fields indicates which fields to read and then merge with the relationship object.
 * @param context the {@link Context} of the request
 * @param value the value of the relationship object
 * @param fieldsList the list of fields to read and merge with the relationship object.
 * @throws ResourceException if an error is encountered.
 */
private void expandResource(Context context,final JsonValue value,List<JsonPointer> fieldsList) throws ResourceException {
  if (!value.isNull() && value.get(SchemaField.FIELD_REFERENCE) != null) {
    final Connection connection=ContextUtil.isExternal(context) ? connectionFactory.getExternalConnection() : connectionFactory.getConnection();
    ReadRequest request=Requests.newReadRequest(value.get(SchemaField.FIELD_REFERENCE).asString());
    request.addField(fieldsList.toArray(new JsonPointer[fieldsList.size()]));
    connection.readAsync(context,request).thenOnResultOrException(new ResultHandler<ResourceResponse>(){
      @Override public void handleResult(      ResourceResponse resource){
        value.asMap().putAll(resource.getContent().asMap());
      }
    }
,new ExceptionHandler<ResourceException>(){
      @Override public void handleException(      ResourceException exception){
        Map<String,Object> valueMap=value.asMap();
        valueMap.put(RelationshipUtil.REFERENCE_ERROR,true);
        valueMap.put(RelationshipUtil.REFERENCE_ERROR_MESSAGE,exception.getMessage());
      }
    }
);
  }
 else {
    logger.warn("String_Node_Str");
  }
}