Internal Server Error When Adding WebMvcConfigurer To Spring Boot Rest Application

I have a Spring Boot app and I wanted to allow other origins to make requests because I got the ‘cors’ error. So I searched and I found this answer: Annotation CrossOrigin not working in Spring boot witch helped for the endpoints that have no body. On the other hand, those who have a body I get Internal Server Error.

Below is the configuration:

@Configuration
@EnableWebMvc
public class CorsConfiguration implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("http://localhost:63343", "http://localhost:3000", "https://smart-booking-ba548.web.app")
                .allowedMethods("GET", "POST", "DELETE", "PUT");
    }
}

The controllers have the @RestController annotation and the methods @Get/Post|Mapping. They return a ResponseEntity<Object>.

Answer

I solved it by putting the following method in main class.

    @Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurer() {
            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/**").allowedOrigins("*");
            }
        };
    }