java.lang.IllegalStateException: Failed to introspect Class

I am trying to add Elasticsearch to my project. I have addded the necessary dependencies to my pom.xml file. When I run the server I am getting this error: > ``` java.lang.IllegalStateException: Fail...

14 Nov at 07:25

SwaggerUI not display enum summary description, C# .net core?

I used [](

Do C# 8 default interface implementations allow for multiple inheritance

According to [](, one of the new features coming in C# 8 is the def...

how to apply common configuration to all entities in ef core

I have entities derived from a base entity in my application which uses ef core code-first approach. ``` public abstract class BaseEntity<T> : IEntity<T> { [Key] [DatabaseGenerated(Database...

13 Nov at 07:5

Is ArrayPool<T>.Rent(Int32) Method thread-safe?

I just found out about ArrayPool existence, but it's documentation is somewhat lacking. I'd like to know if [Rent(.)](

13 Nov at 04:55

WebApplicationFactory throws error that contentRootPath does not exist in ASP.NET Core integration test

I have a ASP.NET Core project with some simple Razor pages and a Web API controller. I'm using [Clean Architecture]( as a starting point. I've renamed the...

12 Nov at 20:44

Create new local server in pgadmin?

I have PostgreSQL 11 and PGadmin 4 installed on windows. Currently I'm connected to a AWS server which hosts all of my data. I want to create a local server (localhost) as a testing environment where...

25 Sep at 06:20

C# Async await deadlock problem gone in .NetCore?

In .NetFramework there was a high risk of a deadlock occuring when synchronizing to the synchronization context using: ``` var result = asyncMethod().Result; var result = asyncMethod().GetAwaiter(...

Why should I return ActionResult instead of object?

Assuming that I have application .NET Core 2.1 Web API + Angular 7 Why should I always returns `ActionResult`? Is there any difference between this: ``` public ActionResult<MyDTO> GetData(){ retur...

6 Jul at 02:17

Access to XMLHttpRequest has been blocked by CORS policy

I've a problem when I try to do PATCH request in an angular 7 web application. In my backend I have: ``` app.use((req, res, next) => { res.set({ "Access-Control-Allow-Origin": "*", ...

16 Jan at 08:59

Identity Server 4 - IDX10630: PII is hidden

I'm fairly new to using encryption and rsa tokens and I'm trying to get IDentityServer4 to not use the developersigning, but one of my own. Here is what I have tried so far: ``` var keyInfo = new RSA...

12 Nov at 02:22

Why is ASP.NET Core's Startup class not an interface or abstract class?

This is in regards to the design principals behind the `Startup` class explained here: [](

Make React useEffect hook not run on initial render

According to the docs: > `componentDidUpdate()` is invoked immediately after updating occurs. This method is not called for the initial render. We can use the new `useEffect()` hook to simulate `com...

12 Nov at 06:52

'IServiceCollection' does not contain a definition for 'AddSpaStaticFiles'

I cant figure out why Startup.cs is throwing this error. I tried the solutions suggested [here](

11 Nov at 21:43

react evironment variables .env return undefined

I am building a react app and i need to fetch data from my api, now i want to store the api url as an environment variable. I have my .env file, i have dotenv installed, here is my code process.env.AP...

10 Nov at 08:31

Logging in .NET Core without DI?

It seems that Microsoft are really trying to shove DI down your throat with .NET Core, and I'm not sure why, but frankly my console app is small and simple and I just don't want to build a whole DI co...

10 Nov at 02:16

Bundler: You must use Bundler 2 or greater with this lockfile

I'm working with heroku and every time I try to push my app this message shows out: ``` remote: Compressing source files... done. remote: Building source: remote: remote: -----> Ruby app detected r...

Terminal error: zsh: permission denied: ./

I am running a command ``` ./ nginx:start ``` and I am getting this error message ``` zsh: permission denied: ./ ``` why could this be happening?

22 Aug at 21:18

Get json casing in backend

Is there a method I can use that gets the casing that is used when ServiceStack converts DTO properties into Json response? For instance a backend model property name `MyProperty` becomes json proper...

9 Nov at 14:7

Enum value in tuple using ServiceStack Ormlite throws null reference exception

I get "Object reference not set to an instance of an object" when using the Tuple notation with an Enum in the return structure. If I change the type in the tuple from Enum type to string it works a...

9 Nov at 14:40

OrmLite - GUIDs as primary keys in Oracle

I'm using OrmLite with both SqlServer, Oracle and PostgreSQL dialects. I want to use GUIDs as primary keys and have a simple object, using the AutoId attribute: ``` public class MyObject { [Auto...

8 Nov at 22:57

Why does Exception from async void crash the app but from async Task is swallowed

I understand that an `async Task`'s Exceptions can be caught by: ``` try { await task; } catch { } ``` while an `async void`'s cannot because it cannot be awaited. But why is it that when the asyn...

8 Nov at 20:22

How can I force a component to re-render with hooks in React?

Considering below hooks example ``` import { useState } from 'react'; function Example() { const [count, setCount] = useState(0); return ( <div> <p>You c...

Windows Forms application option seems to be missing?

I'm learning how to design a Windows Forms Application in Visual Studio 2017. The tutorial asks me to create a new project using the File -> New -> Project option and selecting 'Windows Forms Applicat...

Equivalent to App.config transforms for .NET Core?

I'm writing a .NET Core console application ( an ASP.NET Core web application). In .NET Framework I would have an `App.config`, and `App.Debug.config`, and an `App.Release.config` file, the latter 2 ...

8 Nov at 13:39