Swagger is not working in my spring boot application when using Docker

Question

I have the springdoc in my application that generates swagger using the default url http://localhost:8090/swagger-ui/index.html If I run the application without docker it works fine, but when using docker it doesn't

Here my dockerfile

FROM openjdk:17

COPY target/subscription-manager-0.0.1-SNAPSHOT.jar subscription-manager.jar



ENTRYPOINT ["java", "-jar", "subscription-manager.jar"]

The docker-compose.yml

services:
  subscription-manager_app:
    container_name: subscription-manager_app
    image: hizam/subscription-manager_app:1.0.0
    build: .
    ports:
      - '8090:8080'
    environment:
      DATABASE_URL: jdbc:postgresql://db:5432/subscription-manager
      DATABASE_USERNAME: postgres
      DATABASE_PASSWORD: 1
    depends_on:
      - db
  db:
    container_name: db
    image: postgres
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: 1
      POSTGRES_DB: subscription-manager
    ports:
      - '5333:5432'
    volumes:
      - pgdata:/var/lib/postgresql/data
volumes:
  pgdata: { }

Here Iam using securityfilterchain which gives authorization to access swagger as shown in this code

@Configuration
@EnableWebSecurity
@EnableMethodSecurity
@RequiredArgsConstructor
public class SecurityConfiguration {

    private final UserService userService;
    private final JwtAuthenticationFilter jwtAuthenticationFilter;

    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception
    {
        http.csrf(AbstractHttpConfigurer::disable)
                .authorizeHttpRequests(authorize->
                authorize.requestMatchers("/swagger-ui/**","/swagger-resources/*","/v3/api-docs/**")
                        .permitAll()
                        .requestMatchers("/api/v1/auth/register","/api/v1/auth/login")
                        .permitAll()
                        .anyRequest().authenticated())
                .httpBasic(Customizer.withDefaults())
                .sessionManagement(session->session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
                .authenticationProvider(authenticationProvider())
                .addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);
        return http.build();
    }

    @Bean
    public AuthenticationProvider authenticationProvider() {
        DaoAuthenticationProvider daoAuthenticationProvider = new DaoAuthenticationProvider();
        daoAuthenticationProvider.setUserDetailsService(userService.userDetailsService());
        daoAuthenticationProvider.setPasswordEncoder(passwordEncoder());
        return daoAuthenticationProvider;

    }

    @Bean
    public AuthenticationManager authenticationManager(AuthenticationConfiguration authenticationConfiguration) throws Exception
    {
        return authenticationConfiguration.getAuthenticationManager();
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

}

Since the Spring Boot app runs on port 8080, make sure to add EXPOSE 8080 in the Dockerfile for correct port mapping in docker-compose (e.g., 8090:8080) — sriram_aleti
– sriram_aleti, Commented Jun 11 at 17:15
When you say "it doesn't work", what specifically doesn't work? If the problem is fetching the Swagger/OpenAPI specification, do other endpoints work? Can you edit the question to include details on what you're trying to call and what exact error you're getting? — David Maze
– David Maze, Commented Jun 11 at 18:21
Yes when entering the url localhost:8090/swagger-ui/index.html This page isn’t working localhost didn’t send any data. ERR_EMPTY_RESPONSE I checked the logs of the container subscription-manager_app shows no error. All other endpoints that are created in the restcontroller are working ex:localhost:8090/api/v1/auth/register. @DavidMaze This happens only when the docker is running. — Daniil Hizam
– Daniil Hizam, Commented Jun 11 at 20:28
If you can reach other endpoints, this suggests that the container is created and the Docker-related wiring is correct. What code or configuration sets up the Swagger-UI endpoint? — David Maze
– David Maze, Commented Jun 11 at 22:12

andycaine · Accepted Answer · 2025-06-11 19:59:23Z

0

I have the springdoc in my application that generates swagger using the default url http://localhost:8090/swagger-ui/index.html

If your app is listening on port 8090 inside the container then you need to map the host port to 8090 in your compose file e.g.:

ports:
  - '8090:8090'

answered Jun 11 at 19:59

andycaine

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4 Comments

Daniil Hizam Jun 11 at 20:21

It wont work because tomcat is running on server 8080. Note : All the endpoints that are created in the restcontroller are working ex:localhost:8090/api/v1/auth/register. The only problem is localhost:8090/swagger-ui/index.html is not working.

andycaine Jun 11 at 20:28

so in the container tomcat is running on 8080 and swagger UI is running on 8090? So map both - 8080:8080 - 8090:8090 Both services should then be available on the respective ports on the host.

Daniil Hizam Jun 12 at 6:23

same issue @andycaine

andycaine Jun 12 at 7:39

so if you run outside of docker (java -jar subscription-manager.jar) which ports does the app expose? Then if you run the container directly (docker run -p <host-port>:<container-port> <image>) you should be able to expose both those ports (with multiple -p flags).

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