Sample of Spring Boot config with custom setting for embedded Tomcat And OAuth ... imports are skiped. https://github.com/joshlong/the-spring-rest-stack/blob/master/code/web/oauth/src/main/java/com/jl/crm/web/Application.java

Application.java

@ComponentScan
@Import(ServiceConfiguration.class)
@EnableHypermediaSupport(type = EnableHypermediaSupport.HypermediaType.HAL)
@EnableAutoConfiguration
public class Application extends SpringBootServletInitializer {
    private static Class<Application> applicationClass = Application.class;

    public static void main(String[] args) {
        SpringApplication.run(applicationClass);
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(applicationClass);
    }


    // you can run this with SSL/TLS. For example, build the application (`mvn clean install`) in the `oauth` directory, then run:    
    //   java -Dspring.profiles.active=production -Dkeystore.file=file:///`pwd`/src/main/resources/keystore.p12 -jar target/oauth-1.0.0.BUILD-SNAPSHOT.jar


    @Profile("production")
    @Bean
    public EmbeddedServletContainerCustomizer containerCustomizer(
            @Value("${keystore.file}") final Resource keystoreFile,
            @Value("${keystore.alias}") final String keystoreAlias,
            @Value("${keystore.type}") final String keystoreType,
            @Value("${keystore.pass}") final String keystorePass,
            @Value("${tls.port}") final int tlsPort
    ) {
        return new EmbeddedServletContainerCustomizer() {
            @Override
            public void customize(ConfigurableEmbeddedServletContainerFactory factory) {
                if (factory instanceof TomcatEmbeddedServletContainerFactory) {
                    TomcatEmbeddedServletContainerFactory containerFactory = (TomcatEmbeddedServletContainerFactory) factory;
                    containerFactory.addConnectorCustomizers(new TomcatConnectorCustomizer() {

                        @Override
                        public void customize(Connector connector) {

                            connector.setPort(tlsPort);
                            connector.setSecure(true);
                            connector.setScheme("https");
                            connector.setAttribute("keyAlias", "tomcat");
                            connector.setAttribute("keystorePass", "password");
                            String absoluteKeystoreFile;
                            try {
                                absoluteKeystoreFile = keystoreFile.getFile().getAbsolutePath();
                                connector.setAttribute("keystoreFile", absoluteKeystoreFile);
                            } catch (IOException e) {
                                throw new IllegalStateException("Cannot load keystore", e);
                            }
                            connector.setAttribute("clientAuth", "false");
                            connector.setAttribute("sslProtocol", "TLS");
                            connector.setAttribute("SSLEnabled", true);

                            Http11NioProtocol proto = (Http11NioProtocol) connector.getProtocolHandler();
                            proto.setSSLEnabled(true);
                            // proto.setClientAuth();
                            // uncomment this to require the
                            // client to authenticate. Then, you can use X509 support in Spring Security
                            proto.setKeystoreFile(absoluteKeystoreFile);
                            proto.setKeystorePass(keystorePass);
                            proto.setKeystoreType(keystoreType);
                            proto.setKeyAlias(keystoreAlias);
                        }
                    });

                }
            }
        };
    }

    @Bean
    MultipartConfigElement multipartConfigElement() {
        return new MultipartConfigElement("");
    }

}

/**
 * Request OAuth authorization:
 * <code>
 * curl -X POST -vu android-crm:123456 http://localhost:8080/oauth/token -H "Accept: application/json" -d "password=cowbell&username=joshlong&grant_type=password&scope=read%2Cwrite&client_secret=123456&client_id=android-crm"
 * </code>
 * <p/>
 * Use the access_token returned in the previous request to make the authorized request to the protected endpoint:
 * <code>
 * curl http://localhost:8080/users/5 -H "Authorization: Bearer <INSERT TOKEN>"
 * </code>
 *
 * @author Roy Clarkson
 * @author Josh Long
 */
@Configuration
@EnableWebSecurity
class WebSecurityConfiguration extends OAuth2ServerConfigurerAdapter {

    private final String applicationName = "crm";

    @Autowired
    private CrmService crmService;

    // @formatter:off
    @Override
    protected void configure(HttpSecurity http) throws Exception {

        http.csrf().disable();
        http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
        http.requestMatchers()
                .and()
                .authorizeRequests()
                .antMatchers("/").permitAll()
                .anyRequest().authenticated()
                .and()
                .apply(new OAuth2ServerConfigurer())
                .tokenStore(new InMemoryTokenStore())
                .resourceId(applicationName);

    }
    // @formatter:on

    // @formatter:off
    @Override
    protected void configure(AuthenticationManagerBuilder authManagerBuilder)
            throws Exception {

        final String scopes[] = "read,write".split(",");
        final String secret = "123456";
        final String authorizedGrantTypes = "password";
        final String authorities = "ROLE_USER";

        authManagerBuilder
                .userDetailsService(new CrmUserDetailsService(this.crmService))
                .and()
                .apply(new InMemoryClientDetailsServiceConfigurer())
                .withClient("android-crm")
                .resourceIds(applicationName)
                .scopes(scopes)
                .authorities(authorities)
                .authorizedGrantTypes(authorizedGrantTypes)
                .secret(secret)
                .and()
                .withClient("ios-crm")
                .resourceIds(applicationName)
                .scopes(scopes)
                .authorities(authorities)
                .authorizedGrantTypes(authorizedGrantTypes)
                .secret(secret);

    }
    // @formatter:on


    @Bean
    @Override
    public UserDetailsService userDetailsServiceBean() throws Exception {
        return super.userDetailsServiceBean();
    }

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }

    @Bean
    PasswordEncoder passwordEncoder() {
        return NoOpPasswordEncoder.getInstance();
    }

    @Bean
    TextEncryptor textEncryptor() {
        return Encryptors.noOpText();
    }
}