Getting 405 - Method Not Allowed in Swagger (Spring Boot) - spring-boot

Question

I'm getting a 405 - Method Not Allowed error when testing a GET method in Postman. In a browser, when trying to use swagger-ui I'm getting a Whitelabel Error Page.
I'm on Java 17, Spring Boot 2.7.3, and I'm using Swagger 3.0.
Here's the Swagger configuration. I've had to remove #Configuration because Spring Boot couldn't start when that annotation was in use and DocumentationType.OAS_30 is here instead of SWAGGER_2 because I'm using Swagger 3.0.
package hr.ogcs.blueprint;
import org.springframework.context.annotation.Bean;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
#EnableSwagger2
public class SwaggerConfig {
#Bean
public Docket api() {
return new Docket(DocumentationType.OAS_30).select()
.apis(RequestHandlerSelectors.basePackage("hr.ogcs.blueprint"))
.paths(PathSelectors.any()).build();
}
}
Here's a Gradle configuration. I've tried with springfox-boot-starter dependency, but the Spring Boot couldn't start with it. So I added swagger2 and swagger-ui dependencies.
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-data-mongodb'
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation 'io.springfox:springfox-swagger2:3.0.0'
implementation 'io.springfox:springfox-swagger-ui:3.0.0'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

Answer 1

Here's a solution:
In order to solve this issue, I dropped the Springfox library and used another library named SpringDoc. The Springfox obviously still doesn't work with Swagger 3.0 so remove this from your Gradle:
implementation 'io.springfox:springfox-swagger2:3.0.0'
implementation 'io.springfox:springfox-swagger-ui:3.0.0'
The solution is quite simple.
Use this dependency instead, and everything will work like a charm:
`implementation` 'org.springdoc:springdoc-openapi-ui:1.6.11'
You don't need any additional Swagger Config file or any annotation. Now go to http://localhost:8080/swagger-ui.html to see the results.
I've followed this tutorial on Baeldung.