Issue with CORS and error and Access-Control-Allow-Origin header

You can try adding CORS mapping in the application class in this way:

@Bean
public WebMvcConfigurer corsConfigurer() {
    return new WebMvcConfigurer() {
            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/api/v1/**")
                .allowedHeaders("*")
                .allowedOrigins("*")
                .allowedMethods("GET", "POST", "PUT", "DELETE")
                .allowCredentials(true)
                .maxAge(3600);
            }
        };
    }

https://spring.io/guides/gs/rest-service-cors/

Assuming you work with SpringBoot security:

Add the following in your configuration class (which extends WebSecurityConfigurerAdapter and has @EnableWebSecurity annotation), add cors configuration:

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.cors().and()
            //other config
    }

//TODO needs to be secured on domain you wants to allow 
@Bean CorsConfigurationSource corsConfigurationSource() { 
final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(); 
source.registerCorsConfiguration("/**", new CorsConfiguration().applyPermitDefaultValues()); 
return source; 
} 

I had it working with this configuration

@Configuration
public class CorsConfig {
   @Bean
   public WebMvcConfigurer corsConfigurer() {
       return new WebMvcConfigurer() {
          @Override
          public void addCorsMappings(CorsRegistry registry) {
            registry.addMapping("/**")
                    .allowedOrigins("http://localhost:4200");
          }
       };
   }
}