Program: 34699
Project: 34699
Buggy source:
/** 
 * {@inheritDoc} 
 */
@Override public void validate(ValidationHelper helper,Context context,String key,Callback t){
  String message;
  for (  String urlTemplate : t.keySet()) {
    if (urlTemplate.isEmpty()) {
      message=Tr.formatMessage(tc,"String_Node_Str");
      helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
      continue;
    }
    List<String> vars=RuntimeExpressionUtils.extractURLVars(urlTemplate);
    if (vars == null) {
      message=Tr.formatMessage(tc,"String_Node_Str",urlTemplate);
      helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
    }
 else {
      for (      String v : vars) {
        if (!RuntimeExpressionUtils.isRuntimeExpression(v)) {
          message=Tr.formatMessage(tc,"String_Node_Str",v);
          helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
        }
      }
      String buildURL=urlTemplate;
      for (      String v : vars) {
        String templateVar="String_Node_Str" + v + "String_Node_Str";
        buildURL=buildURL.replace(templateVar,"String_Node_Str");
      }
      if (!ValidatorUtils.isValidURL(buildURL)) {
        message=Tr.formatMessage(tc,"String_Node_Str",urlTemplate);
        helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
      }
    }
    Object pathItem=t.get(urlTemplate);
    if (!(pathItem instanceof PathItem)) {
      message=Tr.formatMessage(tc,"String_Node_Str",urlTemplate);
      helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
    }
  }
}

Fixed version (ground truth):
/** 
 * {@inheritDoc} 
 */
@Override public void validate(ValidationHelper helper,Context context,String key,Callback t){
  String message;
  for (  String urlTemplate : t.keySet()) {
    if (urlTemplate.isEmpty()) {
      message=Tr.formatMessage(tc,"String_Node_Str");
      helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
      continue;
    }
    List<String> vars=RuntimeExpressionUtils.extractURLVars(urlTemplate);
    if (vars == null) {
      message=Tr.formatMessage(tc,"String_Node_Str",urlTemplate);
      helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
    }
 else {
      for (      String v : vars) {
        if (!RuntimeExpressionUtils.isRuntimeExpression(v)) {
          message=Tr.formatMessage(tc,"String_Node_Str",v);
          helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
        }
      }
      String buildURL=urlTemplate;
      for (      String v : vars) {
        String templateVar="String_Node_Str" + v + "String_Node_Str";
        buildURL=buildURL.replace(templateVar,"String_Node_Str");
      }
      if (urlTemplate.contains("String_Node_Str")) {
        if (OpenAPIUtils.isDebugEnabled(tc)) {
          Tr.debug(tc,"String_Node_Str" + key);
        }
      }
 else {
        if (!ValidatorUtils.isValidURI(buildURL)) {
          message=Tr.formatMessage(tc,"String_Node_Str",urlTemplate);
          helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
        }
      }
    }
    Object pathItem=t.get(urlTemplate);
    if (!(pathItem instanceof PathItem)) {
      message=Tr.formatMessage(tc,"String_Node_Str",urlTemplate);
      helper.addValidationEvent(new ValidationEvent(ValidationEvent.Severity.ERROR,context.getLocation(),message));
    }
  }
}