BasicErrorController에서 @RequestMapping("${server.error.path:${error.path:/error}}")의 의미

[`김영한의 스프링 MVC 2` : `API 예외처리` 강의를 듣던 중 생긴 궁금증]

 

 

chatGPT 에게 질문해봤다.

 

Question : @RequestMapping("${server.error.path:${error.path:/error}}") what mean?

 

Answer : In the context of a Java web application using the Spring Framework, the @RequestMapping annotation is used to map HTTP requests to a specific method or controller in your application. Let's break down the expression you provided:

 

```java

@RequestMapping("${server.error.path:${error.path:/error}}")

```

 

1. @RequestMapping: This annotation is used to map web requests to controller methods in Spring applications.
2. "${server.error.path:${error.path:/error}}": This is a SpEL (Spring Expression Language) expression enclosed in double quotes. SpEL is used for defining expressions in the Spring Framework.
   • ${server.error.path}: This part is an expression that attempts to retrieve a value from a property named server.error.path.
   • :${error.path:/error}: If the server.error.path property is not defined, this part provides a default value by attempting to retrieve a value from a property named error.path. If error.path is not defined either, it defaults to "/error".

 

So, in summary, the @RequestMapping annotation is being used to map the specified path for handling error-related requests in a Spring application. The path is determined dynamically based on the properties server.error.path and error.path, with a default value of "/error" if these properties are not defined.

 

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[결론]

 

@RequestMapping의 매개변수로 들어가는 "${server.error.path:${error.path:/error}}" 는 springEL문법이다.

 

server.error.path 라는 프로퍼티가 존재하면 먼저 조회된다.

server.error.path 가 정의되어 있지 않은 경우 → error.path 프로퍼티를 조회한다.

error.path 가 정의되어 있지 않은 경우 → 기본적으로 "/error" 경로를 사용한다.