access | Access without a real handle

This problem's caused by a bug in Springfox. It's making an assumption about how Spring MVC is set up that doesn't always hold true. Specifically, it's assuming that MVC's path matching will use the Ant-based path matcher and not the PathPattern-based matcher. PathPattern-based matching has been an option for some time now and is the default as of Spring Boot 2.6.

As described in Spring Boot 2.6's release notes, you can restore the configuration that Springfox assumes will be used by setting spring.mvc.pathmatch.matching-strategy to ant-path-matcher in your application.properties file. Note that this will only work if you are not using Spring Boot's Actuator. The Actuator always uses PathPattern-based parsing, irrespective of the configured matching-strategy. A change to Springfox will be required if you want to use it with the Actuator in Spring Boot 2.6 and later.

Without a declaration of field, this isn’t even valid syntax: the < can’t begin a template argument list, and expressions aren’t allowed there in a member-declaration. (With a suitable declaration, it could be an invalid declaration with two types and no variables.) Definitely diagnosable, and definitely a Clang bug.

Assuming an appsettings.json

You can access the command line arguments from anywhere in your code using the Environment class.

In particular, you can use Environment.GetCommandLineArgs:

I know this does not solve your problem directly, but consider moving to springdoc which most recent release supports Spring Boot 2.6.0. Springfox is so buggy at this point that is a pain to use. I've moved to springdoc 2 years ago because of its Spring WebFlux support and I am very happy about it. Additionally, it also supports Kotlin Coroutines, which I am not sure Springfox does.

If you decide to migrate, springdoc even has a migration guide.

Remove equal sign. On the screenshot you use Kotlin configuration, but Groovy is needed here. See the difference:

I am also stuck with the same problem because I installed the latest version of Node.js (v17.0.1).

Just go for node.js v14.18.1 and remove the latest version just use the stable version v14.18.1

You need to create a personal access token. You can find the instructions on creating personal access token in Creating a personal access token

Make sure you keep the access token secure & secret. After that you need to replace your current saved password in the device (laptop/desktop) with the access token. In macOS you can search for Keychain and find GitHub with an Internet password and replace it with your access token. For instructions, see Updating credentials from the macOS Keychain.

In Windows, it might be Credential Manager (I'm not sure). Check this out: How to update your Git credentials on Windows

It does not default to zero. The sample answer is wrong. Undefined behaviour is undefined; the value may be 0, it may be 100. Accessing it may cause a seg fault, or cause your computer to be formatted.

As to why it's not an error, it's because C++ is not required to do bounds checking on arrays. You could use a vector and use the at function, which throws exceptions if you go outside the bounds, but arrays do not.