Skip to main content

NHibernate.Hql.Ast.ANTLR.QuerySyntaxException

Last week a colleagued shared the following error message:

NHibernate.Hql.Ast.ANTLR.QuerySyntaxException: Exception of type 'Antlr.Runtime.NoViableAltException' was thrown.

The error happened in an ASP.NET Web API controller using the built-in OData functionality in combination with NHibernate. Further investigation showed that the problem occured when one of the following OData filters were used:

  • startswith
  • a combination of ‘and’ and/or ‘or’ conditions

Some query url examples that are causing trouble:

  • Products?$filter=startswith(ProductName,’ABC’)
  • Orders?$filter=year(OrderData eq 2016 and OrderType eq 'FastShipping'

NHibernate is unable to parse the expression tree generated by ASP.NET Web API. Luckily someone already created a solution for this problem; https://github.com/Pathoschild/webapi.nhibernate-odata/blob/master/README.md

Install the NuGet package and apply the attribute to your queryable Web API controller action:

[Queryable, FixOdataQuery]
public IQueryable<Product> Get()
{
    return ...;
}
Labels:

Popular posts from this blog

.NET 8–Keyed/Named Services

A feature that a lot of IoC container libraries support but that was missing in the default DI container provided by Microsoft is the support for Keyed or Named Services. This feature allows you to register the same type multiple times using different names, allowing you to resolve a specific instance based on the circumstances. Although there is some controversy if supporting this feature is a good idea or not, it certainly can be handy. To support this feature a new interface IKeyedServiceProvider got introduced in .NET 8 providing 2 new methods on our ServiceProvider instance: object? GetKeyedService(Type serviceType, object? serviceKey); object GetRequiredKeyedService(Type serviceType, object? serviceKey); To use it, we need to register our service using one of the new extension methods: Resolving the service can be done either through the FromKeyedServices attribute: or by injecting the IKeyedServiceProvider interface and calling the GetRequiredKeyedServic...
Read more

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.
Read more

Kubernetes–Limit your environmental impact

Reducing the carbon footprint and CO2 emission of our (cloud) workloads, is a responsibility of all of us. If you are running a Kubernetes cluster, have a look at Kube-Green . kube-green is a simple Kubernetes operator that automatically shuts down (some of) your pods when you don't need them. A single pod produces about 11 Kg CO2eq per year( here the calculation). Reason enough to give it a try! Installing kube-green in your cluster The easiest way to install the operator in your cluster is through kubectl. We first need to install a cert-manager: kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.5/cert-manager.yaml Remark: Wait a minute before you continue as it can take some time before the cert-manager is up & running inside your cluster. Now we can install the kube-green operator: kubectl apply -f https://github.com/kube-green/kube-green/releases/latest/download/kube-green.yaml Now in the namespace where we want t...
Read more