Program: 34705
Project: 34705
Buggy source:
private void validateParameters(ValidationHelper helper,Context context,String pathStr,PathItem path){
  Set<String> definedSharedPathParameters=new HashSet<String>(), definedSharedQueryParameters=new HashSet<String>(), definedSharedHeaderParameters=new HashSet<String>(), definedSharedCookieParameters=new HashSet<String>();
  List<Parameter> sharedParameters=path.getParameters();
  if (sharedParameters != null) {
    for (    Parameter parameter : sharedParameters) {
      if (isPathParameter(parameter)) {
        if (!parameter.getRequired()) {
          final String message=Tr.formatMessage(tc,"String_Node_Str",parameter.getName(),pathStr);
          helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
        }
      }
      if ((isPathParameter(parameter) && !definedSharedPathParameters.add(parameter.getName())) || (isQueryParameter(parameter) && !definedSharedQueryParameters.add(parameter.getName())) || (isHeaderParameter(parameter) && !definedSharedHeaderParameters.add(parameter.getName()))|| (isCookieParameter(parameter) && !definedSharedCookieParameters.add(parameter.getName()))) {
        final String message=Tr.formatMessage(tc,"String_Node_Str",pathStr,parameter.getIn(),parameter.getName());
        helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
      }
    }
  }
  Set<String> declaredPathParameters=validatePathAndRetrievePathParams(helper,context,pathStr);
  if (!declaredPathParameters.containsAll(definedSharedPathParameters)) {
    Set<String> undeclaredParameters=new HashSet<String>(definedSharedPathParameters);
    undeclaredParameters.removeAll(declaredPathParameters);
    boolean isMultiple=undeclaredParameters.size() > 1;
    final String message;
    if (isMultiple) {
      message=Tr.formatMessage(tc,"String_Node_Str",pathStr,undeclaredParameters.size(),undeclaredParameters);
    }
 else {
      message=Tr.formatMessage(tc,"String_Node_Str",pathStr,undeclaredParameters);
    }
    helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.WARNING,context.getLocation(),message));
  }
  final Map<PathItem.HttpMethod,Operation> operationMap=path.readOperationsMap();
  if (operationMap != null) {
    for (    PathItem.HttpMethod httpMethod : operationMap.keySet()) {
      Operation operation=operationMap.get(httpMethod);
      validateOperationParameters(helper,context,operation,declaredPathParameters,definedSharedPathParameters,pathStr,httpMethod.toString());
    }
  }
}

Fixed version (ground truth):
private void validateParameters(ValidationHelper helper,Context context,String pathStr,PathItem path){
  Set<String> definedSharedPathParameters=new HashSet<String>(), definedSharedQueryParameters=new HashSet<String>(), definedSharedHeaderParameters=new HashSet<String>(), definedSharedCookieParameters=new HashSet<String>();
  List<Parameter> sharedParameters=path.getParameters();
  if (sharedParameters != null) {
    for (    Parameter param : sharedParameters) {
      Parameter parameter=param;
      String reference=parameter.getRef();
      if (reference != null && !reference.isEmpty()) {
        Object componentItem=ReferenceValidator.getInstance().validate(helper,context,null,reference);
        if (parameter.getClass().isInstance(componentItem)) {
          parameter=(Parameter)componentItem;
        }
      }
      if (isPathParameter(parameter)) {
        if (!parameter.getRequired()) {
          final String message=Tr.formatMessage(tc,"String_Node_Str",parameter.getName(),pathStr);
          helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
        }
      }
      if ((isPathParameter(parameter) && !definedSharedPathParameters.add(parameter.getName())) || (isQueryParameter(parameter) && !definedSharedQueryParameters.add(parameter.getName())) || (isHeaderParameter(parameter) && !definedSharedHeaderParameters.add(parameter.getName()))|| (isCookieParameter(parameter) && !definedSharedCookieParameters.add(parameter.getName()))) {
        final String message=Tr.formatMessage(tc,"String_Node_Str",pathStr,parameter.getIn(),parameter.getName());
        helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
      }
    }
  }
  Set<String> declaredPathParameters=validatePathAndRetrievePathParams(helper,context,pathStr);
  if (!declaredPathParameters.containsAll(definedSharedPathParameters)) {
    Set<String> undeclaredParameters=new HashSet<String>(definedSharedPathParameters);
    undeclaredParameters.removeAll(declaredPathParameters);
    boolean isMultiple=undeclaredParameters.size() > 1;
    final String message;
    if (isMultiple) {
      message=Tr.formatMessage(tc,"String_Node_Str",pathStr,undeclaredParameters.size(),undeclaredParameters);
    }
 else {
      message=Tr.formatMessage(tc,"String_Node_Str",pathStr,undeclaredParameters);
    }
    helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.WARNING,context.getLocation(),message));
  }
  final Map<PathItem.HttpMethod,Operation> operationMap=path.readOperationsMap();
  if (operationMap != null) {
    for (    PathItem.HttpMethod httpMethod : operationMap.keySet()) {
      Operation operation=operationMap.get(httpMethod);
      validateOperationParameters(helper,context,operation,declaredPathParameters,definedSharedPathParameters,pathStr,httpMethod.toString());
    }
  }
}