Program: 34706
Project: 34706
Buggy source:
private void validateOperationParameters(ValidationHelper helper,Context context,Operation operation,Set<String> declaredPathParameters,Set<String> definedSharedPathParams,String path,String operationType){
  Set<String> definedPathParameters=new HashSet<String>(), definedQueryParameters=new HashSet<String>(), definedHeaderParameters=new HashSet<String>(), definedCookieParameters=new HashSet<String>();
  List<Parameter> parameters=operation.getParameters();
  if (parameters != null && !parameters.isEmpty()) {
    for (    Parameter parameter : parameters) {
      if (parameter != null) {
        if (isPathParameter(parameter)) {
          if (!parameter.getRequired()) {
            final String message=Tr.formatMessage(tc,"String_Node_Str",parameter.getName(),operationType,path);
            helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
          }
        }
        if ((isPathParameter(parameter) && !definedPathParameters.add(parameter.getName())) || (isQueryParameter(parameter) && !definedQueryParameters.add(parameter.getName())) || (isHeaderParameter(parameter) && !definedHeaderParameters.add(parameter.getName()))|| (isCookieParameter(parameter) && !definedCookieParameters.add(parameter.getName()))) {
          final String message=Tr.formatMessage(tc,"String_Node_Str",operationType,path,parameter.getIn(),parameter.getName());
          helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
        }
      }
 else {
        final String message=Tr.formatMessage(tc,"String_Node_Str",operationType,path);
        helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
      }
    }
  }
  if (!declaredPathParameters.containsAll(definedPathParameters)) {
    Set<String> undeclaredParameters=new HashSet<String>(definedPathParameters);
    undeclaredParameters.removeAll(declaredPathParameters);
    boolean isMultiple=undeclaredParameters.size() > 1;
    final String message;
    if (isMultiple) {
      message=Tr.formatMessage(tc,"String_Node_Str",operationType,path,undeclaredParameters.size(),undeclaredParameters);
    }
 else {
      message=Tr.formatMessage(tc,"String_Node_Str",operationType,path,undeclaredParameters);
    }
    helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.WARNING,context.getLocation(),message));
  }
  for (  String declaredParam : declaredPathParameters) {
    if (!definedSharedPathParams.contains(declaredParam) && !definedPathParameters.contains(declaredParam)) {
      final String message=Tr.formatMessage(tc,"String_Node_Str",operationType,path,declaredParam);
      helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
    }
  }
}

Fixed version (ground truth):
private void validateOperationParameters(ValidationHelper helper,Context context,Operation operation,Set<String> declaredPathParameters,Set<String> definedSharedPathParams,String path,String operationType){
  Set<String> definedPathParameters=new HashSet<String>(), definedQueryParameters=new HashSet<String>(), definedHeaderParameters=new HashSet<String>(), definedCookieParameters=new HashSet<String>();
  List<Parameter> parameters=operation.getParameters();
  if (parameters != null && !parameters.isEmpty()) {
    for (    Parameter param : parameters) {
      if (param != null) {
        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(),operationType,path);
            helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
          }
        }
        if ((isPathParameter(parameter) && !definedPathParameters.add(parameter.getName())) || (isQueryParameter(parameter) && !definedQueryParameters.add(parameter.getName())) || (isHeaderParameter(parameter) && !definedHeaderParameters.add(parameter.getName()))|| (isCookieParameter(parameter) && !definedCookieParameters.add(parameter.getName()))) {
          final String message=Tr.formatMessage(tc,"String_Node_Str",operationType,path,parameter.getIn(),parameter.getName());
          helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
        }
      }
 else {
        final String message=Tr.formatMessage(tc,"String_Node_Str",operationType,path);
        helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
      }
    }
  }
  if (!declaredPathParameters.containsAll(definedPathParameters)) {
    Set<String> undeclaredParameters=new HashSet<String>(definedPathParameters);
    undeclaredParameters.removeAll(declaredPathParameters);
    boolean isMultiple=undeclaredParameters.size() > 1;
    final String message;
    if (isMultiple) {
      message=Tr.formatMessage(tc,"String_Node_Str",operationType,path,undeclaredParameters.size(),undeclaredParameters);
    }
 else {
      message=Tr.formatMessage(tc,"String_Node_Str",operationType,path,undeclaredParameters);
    }
    helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.WARNING,context.getLocation(),message));
  }
  for (  String declaredParam : declaredPathParameters) {
    if (!definedSharedPathParams.contains(declaredParam) && !definedPathParameters.contains(declaredParam)) {
      final String message=Tr.formatMessage(tc,"String_Node_Str",operationType,path,declaredParam);
      helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
    }
  }
}