This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Security 6.5.5!

Java Configuration

General support for Java configuration was added to Spring Framework in Spring 3.1. Spring Security 3.2 introduced Java configuration to let users configure Spring Security without the use of any XML.

If you are familiar with the Security Namespace Configuration, you should find quite a few similarities between it and Spring Security Java configuration.

Spring Security provides lots of sample applications to demonstrate the use of Spring Security Java Configuration.

Hello Web Security Java Configuration

The first step is to create our Spring Security Java Configuration. The configuration creates a Servlet Filter known as the springSecurityFilterChain, which is responsible for all the security (protecting the application URLs, validating submitted username and passwords, redirecting to the log in form, and so on) within your application. The following example shows the most basic example of a Spring Security Java Configuration:

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.*;
import org.springframework.security.config.annotation.authentication.builders.*;
import org.springframework.security.config.annotation.web.configuration.*;

@Configuration
@EnableWebSecurity
public class WebSecurityConfig {

	@Bean
	public UserDetailsService userDetailsService() {
		InMemoryUserDetailsManager manager = new InMemoryUserDetailsManager();
		manager.createUser(User.withDefaultPasswordEncoder().username("user").password("password").roles("USER").build());
		return manager;
	}
}

This configuration is not complex or extensive, but it does a lot:

AbstractSecurityWebApplicationInitializer

The next step is to register the springSecurityFilterChain with the WAR file. You can do so in Java configuration with Spring’s WebApplicationInitializer support in a Servlet 3.0+ environment. Not surprisingly, Spring Security provides a base class (AbstractSecurityWebApplicationInitializer) to ensure that the springSecurityFilterChain gets registered for you. The way in which we use AbstractSecurityWebApplicationInitializer differs depending on if we are already using Spring or if Spring Security is the only Spring component in our application.

AbstractSecurityWebApplicationInitializer without Existing Spring

If you are not using Spring or Spring MVC, you need to pass the WebSecurityConfig to the superclass to ensure the configuration is picked up:

import org.springframework.security.web.context.*;

public class SecurityWebApplicationInitializer
	extends AbstractSecurityWebApplicationInitializer {

	public SecurityWebApplicationInitializer() {
		super(WebSecurityConfig.class);
	}
}

The SecurityWebApplicationInitializer:

  • Automatically registers the springSecurityFilterChain Filter for every URL in your application.

  • Add a ContextLoaderListener that loads the WebSecurityConfig.

AbstractSecurityWebApplicationInitializer with Spring MVC

If we use Spring elsewhere in our application, we probably already have a WebApplicationInitializer that is loading our Spring Configuration. If we use the previous configuration, we would get an error. Instead, we should register Spring Security with the existing ApplicationContext. For example, if we use Spring MVC, our SecurityWebApplicationInitializer could look something like the following:

import org.springframework.security.web.context.*;

public class SecurityWebApplicationInitializer
	extends AbstractSecurityWebApplicationInitializer {

}

This only registers the springSecurityFilterChain for every URL in your application. After that, we need to ensure that WebSecurityConfig was loaded in our existing ApplicationInitializer. For example, if we use Spring MVC it is added in the getServletConfigClasses():

public class MvcWebApplicationInitializer extends
		AbstractAnnotationConfigDispatcherServletInitializer {

	@Override
	protected Class<?>[] getServletConfigClasses() {
		return new Class[] { WebSecurityConfig.class, WebMvcConfig.class };
	}

	// ... other overrides ...
}

The reason for this is that Spring Security needs to be able to inspect some Spring MVC configuration in order to appropriately configure underlying request matchers, so they need to be in the same application context. Placing Spring Security in getRootConfigClasses places it into a parent application context that may not be able to find Spring MVC’s PathPatternParser.

Configuring for Multiple Spring MVC Dispatchers

If desired, any Spring Security configuration that is unrelated to Spring MVC may be placed in a different configuration class like so:

public class MvcWebApplicationInitializer extends
		AbstractAnnotationConfigDispatcherServletInitializer {

	@Override
    protected Class<?>[] getRootConfigClasses() {
		return new Class[] { NonWebSecurityConfig.class };
    }

	@Override
	protected Class<?>[] getServletConfigClasses() {
		return new Class[] { WebSecurityConfig.class, WebMvcConfig.class };
	}

	// ... other overrides ...
}

This can be helpful if you have multiple instances of AbstractAnnotationConfigDispatcherServletInitializer and don’t want to duplicate the general security configuration across both of them.

HttpSecurity

Thus far, our WebSecurityConfig contains only information about how to authenticate our users. How does Spring Security know that we want to require all users to be authenticated? How does Spring Security know we want to support form-based authentication? Actually, there is a configuration class (called SecurityFilterChain) that is being invoked behind the scenes. It is configured with the following default implementation:

@Bean
public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
	http
		.authorizeHttpRequests((authorize) -> authorize
			.anyRequest().authenticated()
		)
		.formLogin(Customizer.withDefaults())
		.httpBasic(Customizer.withDefaults());
	return http.build();
}

The default configuration (shown in the preceding example):

  • Ensures that any request to our application requires the user to be authenticated

  • Lets users authenticate with form-based login

  • Lets users authenticate with HTTP Basic authentication

Note that this configuration parallels the XML namespace configuration:

<http>
	<intercept-url pattern="/**" access="authenticated"/>
	<form-login />
	<http-basic />
</http>

Multiple HttpSecurity Instances

To effectively manage security in an application where certain areas need different protection, we can employ multiple filter chains alongside the securityMatcher DSL method. This approach allows us to define distinct security configurations tailored to specific parts of the application, enhancing overall application security and control.

We can configure multiple HttpSecurity instances just as we can have multiple <http> blocks in XML. The key is to register multiple SecurityFilterChain @Beans. The following example has a different configuration for URLs that begin with /api/:

@Configuration
@EnableWebSecurity
public class MultiHttpSecurityConfig {
	@Bean                                                             (1)
	public UserDetailsService userDetailsService() throws Exception {
		UserBuilder users = User.withDefaultPasswordEncoder();
		InMemoryUserDetailsManager manager = new InMemoryUserDetailsManager();
		manager.createUser(users.username("user").password("password").roles("USER").build());
		manager.createUser(users.username("admin").password("password").roles("USER","ADMIN").build());
		return manager;
	}

	@Bean
	@Order(1)                                                        (2)
	public SecurityFilterChain apiFilterChain(HttpSecurity http) throws Exception {
		http
			.securityMatcher("/api/**")                              (3)
			.authorizeHttpRequests((authorize) -> authorize
				.anyRequest().hasRole("ADMIN")
			)
			.httpBasic(Customizer.withDefaults());
		return http.build();
	}

	@Bean                                                            (4)
	public SecurityFilterChain formLoginFilterChain(HttpSecurity http) throws Exception {
		http
			.authorizeHttpRequests((authorize) -> authorize
				.anyRequest().authenticated()
			)
			.formLogin(Customizer.withDefaults());
		return http.build();
	}
}
1 Configure Authentication as usual.
2 Create an instance of SecurityFilterChain that contains @Order to specify which SecurityFilterChain should be considered first.
3 The http.securityMatcher() states that this HttpSecurity is applicable only to URLs that begin with /api/.
4 Create another instance of SecurityFilterChain. If the URL does not begin with /api/, this configuration is used. This configuration is considered after apiFilterChain, since it has an @Order value after 1 (no @Order defaults to last).

Choosing securityMatcher or requestMatchers

A common question is:

What is the difference between the http.securityMatcher() method and requestMatchers() used for request authorization (i.e. inside of http.authorizeHttpRequests())?

To answer this question, it helps to understand that each HttpSecurity instance used to build a SecurityFilterChain contains a RequestMatcher to match incoming requests. If a request does not match a SecurityFilterChain with higher priority (e.g. @Order(1)), the request can be tried against a filter chain with lower priority (e.g. no @Order).

The matching logic for multiple filter chains is performed by the FilterChainProxy.

The default RequestMatcher matches any request to ensure Spring Security protects all requests by default.

Specifying a securityMatcher overrides this default.

If no filter chain matches a particular request, the request is not protected by Spring Security.

The following example demonstrates a single filter chain that only protects requests that begin with /secured/:

@Configuration
@EnableWebSecurity
public class PartialSecurityConfig {

	@Bean
	public UserDetailsService userDetailsService() throws Exception {
		// ...
	}

	@Bean
	public SecurityFilterChain securedFilterChain(HttpSecurity http) throws Exception {
		http
			.securityMatcher("/secured/**")                            (1)
			.authorizeHttpRequests((authorize) -> authorize
				.requestMatchers("/secured/user").hasRole("USER")      (2)
				.requestMatchers("/secured/admin").hasRole("ADMIN")    (3)
				.anyRequest().authenticated()                          (4)
			)
			.httpBasic(Customizer.withDefaults())
			.formLogin(Customizer.withDefaults());
		return http.build();
	}
}
1 Requests that begin with /secured/ will be protected but any other requests are not protected.
2 Requests to /secured/user require the ROLE_USER authority.
3 Requests to /secured/admin require the ROLE_ADMIN authority.
4 Any other requests (such as /secured/other) simply require an authenticated user.

It is recommended to provide a SecurityFilterChain that does not specify any securityMatcher to ensure the entire application is protected, as demonstrated in the earlier example.

Notice that the requestMatchers method only applies to individual authorization rules. Each request listed there must also match the overall securityMatcher for this particular HttpSecurity instance used to create the SecurityFilterChain. Using anyRequest() in this example matches all other requests within this particular SecurityFilterChain (which must begin with /secured/).

See Authorize HttpServletRequests for more information on requestMatchers.

SecurityFilterChain Endpoints

Several filters in the SecurityFilterChain directly provide endpoints, such as the UsernamePasswordAuthenticationFilter which is set up by http.formLogin() and provides the POST /login endpoint. In the above example, the /login endpoint is not matched by http.securityMatcher("/secured/**") and therefore that application would not have any GET /login or POST /login endpoint. Such requests would return 404 Not Found. This is often surprising to users.

Specifying http.securityMatcher() affects what requests are matched by that SecurityFilterChain. However, it does not automatically affect endpoints provided by the filter chain. In such cases, you may need to customize the URL of any endpoints you would like the filter chain to provide.

The following example demonstrates a configuration that secures requests that begin with /secured/ and denies all other requests, while also customizing endpoints provided by the SecurityFilterChain:

@Configuration
@EnableWebSecurity
public class SecuredSecurityConfig {

	@Bean
	public UserDetailsService userDetailsService() throws Exception {
		// ...
	}

	@Bean
	@Order(1)
	public SecurityFilterChain securedFilterChain(HttpSecurity http) throws Exception {
		http
			.securityMatcher("/secured/**")                            (1)
			.authorizeHttpRequests((authorize) -> authorize
				.anyRequest().authenticated()                          (2)
			)
			.formLogin((formLogin) -> formLogin                          (3)
				.loginPage("/secured/login")
				.loginProcessingUrl("/secured/login")
				.permitAll()
			)
			.logout((logout) -> logout                                   (4)
				.logoutUrl("/secured/logout")
				.logoutSuccessUrl("/secured/login?logout")
				.permitAll()
			);
		return http.build();
	}

	@Bean
	public SecurityFilterChain defaultFilterChain(HttpSecurity http) throws Exception {
		http
			.authorizeHttpRequests((authorize) -> authorize
				.anyRequest().denyAll()                                (5)
			);
		return http.build();
	}
}
1 Requests that begin with /secured/ will be protected by this filter chain.
2 Requests that begin with /secured/ require an authenticated user.
3 Customize form login to prefix URLs with /secured/.
4 Customize logout to prefix URLs with /secured/.
5 All other requests will be denied.

This example customizes the login and logout pages, which disables Spring Security’s generated pages. You must provide your own custom endpoints for GET /secured/login and GET /secured/logout. Note that Spring Security still provides POST /secured/login and POST /secured/logout endpoints for you.

Real World Example

The following example demonstrates a slightly more real-world configuration putting all of these elements together:

@Configuration
@EnableWebSecurity
public class BankingSecurityConfig {

    @Bean                                                              (1)
    public UserDetailsService userDetailsService() {
		UserBuilder users = User.withDefaultPasswordEncoder();
        InMemoryUserDetailsManager manager = new InMemoryUserDetailsManager();
        manager.createUser(users.username("user1").password("password").roles("USER", "VIEW_BALANCE").build());
        manager.createUser(users.username("user2").password("password").roles("USER").build());
        manager.createUser(users.username("admin").password("password").roles("ADMIN").build());
        return manager;
    }

    @Bean
    @Order(1)                                                          (2)
    public SecurityFilterChain approvalsSecurityFilterChain(HttpSecurity http) throws Exception {
        String[] approvalsPaths = { "/accounts/approvals/**", "/loans/approvals/**", "/credit-cards/approvals/**" };
        http
            .securityMatcher(approvalsPaths)
            .authorizeHttpRequests((authorize) -> authorize
				.anyRequest().hasRole("ADMIN")
            )
            .httpBasic(Customizer.withDefaults());
        return http.build();
    }

    @Bean
    @Order(2)                                                          (3)
    public SecurityFilterChain bankingSecurityFilterChain(HttpSecurity http) throws Exception {
        String[] bankingPaths = { "/accounts/**", "/loans/**", "/credit-cards/**", "/balances/**" };
		String[] viewBalancePaths = { "/balances/**" };
        http
			.securityMatcher(bankingPaths)
			.authorizeHttpRequests((authorize) -> authorize
				.requestMatchers(viewBalancePaths).hasRole("VIEW_BALANCE")
				.anyRequest().hasRole("USER")
            );
        return http.build();
    }

    @Bean                                                              (4)
    public SecurityFilterChain defaultSecurityFilterChain(HttpSecurity http) throws Exception {
		String[] allowedPaths = { "/", "/user-login", "/user-logout", "/notices", "/contact", "/register" };
        http
            .authorizeHttpRequests((authorize) -> authorize
				.requestMatchers(allowedPaths).permitAll()
				.anyRequest().authenticated()
            )
			.formLogin((formLogin) -> formLogin
				.loginPage("/user-login")
				.loginProcessingUrl("/user-login")
			)
			.logout((logout) -> logout
				.logoutUrl("/user-logout")
				.logoutSuccessUrl("/?logout")
			);
        return http.build();
    }
}
1 Begin by configuring authentication settings.
2 Define a SecurityFilterChain instance with @Order(1), which means that this filter chain will have the highest priority. This filter chain applies only to requests that begin with /accounts/approvals/, /loans/approvals/ or /credit-cards/approvals/. Requests to this filter chain require the ROLE_ADMIN authority and allow HTTP Basic Authentication.
3 Next, create another SecurityFilterChain instance with @Order(2) which will be considered second. This filter chain applies only to requests that begin with /accounts/, /loans/, /credit-cards/, or /balances/. Notice that because this filter chain is second, any requests that include /approvals/ will match the previous filter chain and will not be matched by this filter chain. Requests to this filter chain require the ROLE_USER authority. This filter chain does not define any authentication because the next (default) filter chain contains that configuration.
4 Lastly, create an additional SecurityFilterChain instance without an @Order annotation. This configuration will handle requests not covered by the other filter chains and will be processed last (no @Order defaults to last). Requests that match /, /user-login, /user-logout, /notices, /contact and /register allow access without authentication. Any other requests require the user to be authenticated to access any URL not explicitly allowed or protected by other filter chains.

Custom DSLs

You can provide your own custom DSLs in Spring Security:

  • Java

  • Kotlin

public class MyCustomDsl extends AbstractHttpConfigurer<MyCustomDsl, HttpSecurity> {
	private boolean flag;

	@Override
	public void init(HttpSecurity http) throws Exception {
		// any method that adds another configurer
		// must be done in the init method
		http.csrf().disable();
	}

	@Override
	public void configure(HttpSecurity http) throws Exception {
		ApplicationContext context = http.getSharedObject(ApplicationContext.class);

		// here we lookup from the ApplicationContext. You can also just create a new instance.
		MyFilter myFilter = context.getBean(MyFilter.class);
		myFilter.setFlag(flag);
		http.addFilterBefore(myFilter, UsernamePasswordAuthenticationFilter.class);
	}

	public MyCustomDsl flag(boolean value) {
		this.flag = value;
		return this;
	}

	public static MyCustomDsl customDsl() {
		return new MyCustomDsl();
	}
}
class MyCustomDsl : AbstractHttpConfigurer<MyCustomDsl, HttpSecurity>() {
    var flag: Boolean = false

    override fun init(http: HttpSecurity) {
        // any method that adds another configurer
        // must be done in the init method
        http.csrf().disable()
    }

    override fun configure(http: HttpSecurity) {
        val context: ApplicationContext = http.getSharedObject(ApplicationContext::class.java)

        // here we lookup from the ApplicationContext. You can also just create a new instance.
        val myFilter: MyFilter = context.getBean(MyFilter::class.java)
        myFilter.setFlag(flag)
        http.addFilterBefore(myFilter, UsernamePasswordAuthenticationFilter::class.java)
    }

    companion object {
        @JvmStatic
        fun customDsl(): MyCustomDsl {
            return MyCustomDsl()
        }
    }
}

This is actually how methods like HttpSecurity.authorizeHttpRequests() are implemented.

You can then use the custom DSL:

  • Java

  • Kotlin

@Configuration
@EnableWebSecurity
public class Config {
	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			.with(MyCustomDsl.customDsl(), (dsl) -> dsl
				.flag(true)
			)
			// ...
		return http.build();
	}
}
@Configuration
@EnableWebSecurity
class Config {

    @Bean
    fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http
            .with(MyCustomDsl.customDsl()) {
                flag = true
            }
            // ...

        return http.build()
    }
}

The code is invoked in the following order:

  • Code in the Config.filterChain method is invoked

  • Code in the MyCustomDsl.init method is invoked

  • Code in the MyCustomDsl.configure method is invoked

If you want, you can have HttpSecurity add MyCustomDsl by default by using SpringFactories. For example, you can create a resource on the classpath named META-INF/spring.factories with the following contents:

META-INF/spring.factories
org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer = sample.MyCustomDsl

You can also explicit disable the default:

  • Java

  • Kotlin

@Configuration
@EnableWebSecurity
public class Config {
	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			.with(MyCustomDsl.customDsl(), (dsl) -> dsl
				.disable()
			)
			...;
		return http.build();
	}
}
@Configuration
@EnableWebSecurity
class Config {

    @Bean
    fun filterChain(http: HttpSecurity): SecurityFilterChain {
        http
            .with(MyCustomDsl.customDsl()) {
                disable()
            }
            // ...
        return http.build()
    }

}

Modular HttpSecurity Configuration

Many users prefer that their Spring Security configuration lives in a centralized place and will choose to configure it in a single SecurityFilterChain instance. However, there are times that users may want to modularize the configuration. This can be done using:

If you are using Spring Security’s Kotlin Configuration, then you can also expose *Dsl → Unit Beans as outlined in Modular HttpSecurityDsl Configuration.

Customizer<HttpSecurity> Beans

If you would like to modularize your security configuration you can place logic in a Customizer<HttpSecurity> Bean. For example, the following configuration will ensure all HttpSecurity instances are configured to:

  • Java

  • Kotlin

@Bean
ThrowingCustomizer<HttpSecurity> httpSecurityCustomizer() {
	return (http) -> http
		.headers((headers) -> headers
			.contentSecurityPolicy((csp) -> csp
				(1)
				.policyDirectives("object-src 'none'")
			)
		)
		(2)
		.redirectToHttps(Customizer.withDefaults());
}
@Bean
fun httpSecurityCustomizer(): ThrowingCustomizer<HttpSecurity> {
    return ThrowingCustomizer { http -> http
        .headers { headers -> headers
            .contentSecurityPolicy { csp -> csp
                (1)
                .policyDirectives("object-src 'none'")
            }
        }
        (2)
        .redirectToHttps(Customizer.withDefaults())
    }
}
1 Set the Content Security Policy to object-src 'none'
2 Redirect any request to https

Top Level HttpSecurity Customizer Beans

If you prefer to have further modularization of your security configuration, Spring Security will automatically apply any top level HttpSecurity Customizer Beans.

A top level HttpSecurity Customizer type can be summarized as any Customizer<T> that matches public HttpSecurity.*(Customizer<T>). This translates to any Customizer<T> that is a single argument to a public method on HttpSecurity.

A few examples can help to clarify. If Customizer<ContentTypeOptionsConfig> is published as a Bean, it will not be be automatically applied because it is an argument to HeadersConfigurer.contentTypeOptions(Customizer) which is not a method defined on HttpSecurity. However, if Customizer<HeadersConfigurer<HttpSecurity>> is published as a Bean, it will be automatically applied because it is an argument to HttpSecurity.headers(Customizer).

For example, the following configuration will ensure that the Content Security Policy is set to object-src 'none':

  • Java

  • Kotlin

@Bean
Customizer<HeadersConfigurer<HttpSecurity>> headersSecurity() {
	return (headers) -> headers
		.contentSecurityPolicy((csp) -> csp
			(1)
			.policyDirectives("object-src 'none'")
		);
}
@Bean
fun headersSecurity(): Customizer<HeadersConfigurer<HttpSecurity>> {
    return Customizer { headers -> headers
        .contentSecurityPolicy { csp -> csp
            (1)
            .policyDirectives("object-src 'none'")
        }
    }
}

Customizer Bean Ordering

First each Customizer<HttpSecurity> Bean is applied using ObjectProvider#orderedStream(). This means that if there are multiple Customizer<HttpSecurity> Beans, the @Order annotation can be added to the Bean definitions to control the ordering.

Next every Top Level HttpSecurity Customizer Beans type is looked up and each is is applied using ObjectProvider#orderedStream(). If there is are two Customizer<HeadersConfigurer<HttpSecurity>> beans and two Customizer<HttpsRedirectConfigurer<HttpSecurity>> instances, the order that each Customizer type is invoked is undefined. However, the order that each instance of Customizer<HttpsRedirectConfigurer<HttpSecurity>> is defined by ObjectProvider#orderedStream() and can be controlled using @Order on the Bean the definitions.

Finally, the HttpSecurity Bean is injected as a Bean. All Customizer instances are applied before the HttpSecurity Bean is created. This allows overriding the customizations provided by the Customizer Beans.

You can find an example below that illustrates the ordering:

  • Java

  • Kotlin

@Bean (4)
SecurityFilterChain springSecurity(HttpSecurity http) throws Exception {
	http
		.authorizeHttpRequests((requests) -> requests
			.anyRequest().authenticated()
		);
	return http.build();
}

@Bean
@Order(Ordered.LOWEST_PRECEDENCE) (2)
ThrowingCustomizer<HttpSecurity> userAuthorization() {
	return (http) -> http
		.authorizeHttpRequests((requests) -> requests
			.requestMatchers("/users/**").hasRole("USER")
		);
}

@Bean
@Order(Ordered.HIGHEST_PRECEDENCE) (1)
ThrowingCustomizer<HttpSecurity> adminAuthorization() {
	return (http) -> http
		.authorizeHttpRequests((requests) -> requests
			.requestMatchers("/admins/**").hasRole("ADMIN")
		);
}

(3)

@Bean
Customizer<HeadersConfigurer<HttpSecurity>> contentSecurityPolicy() {
	return (headers) -> headers
		.contentSecurityPolicy((csp) -> csp
			.policyDirectives("object-src 'none'")
		);
}

@Bean
Customizer<HeadersConfigurer<HttpSecurity>> contentTypeOptions() {
	return (headers) -> headers
		.contentTypeOptions(Customizer.withDefaults());
}

@Bean
Customizer<HttpsRedirectConfigurer<HttpSecurity>> httpsRedirect() {
	return Customizer.withDefaults();
}
@Bean (4)
fun springSecurity(http: HttpSecurity): SecurityFilterChain {
    http
        .authorizeHttpRequests({ requests -> requests
            .anyRequest().authenticated()
        })
    return http.build()
}

@Bean
@Order(Ordered.LOWEST_PRECEDENCE)  (2)
fun userAuthorization(): ThrowingCustomizer<HttpSecurity> {
    return ThrowingCustomizer { http -> http
        .authorizeHttpRequests { requests -> requests
            .requestMatchers("/users/**").hasRole("USER")
        }
    }
}

@Bean
@Order(Ordered.HIGHEST_PRECEDENCE) (1)
fun adminAuthorization(): ThrowingCustomizer<HttpSecurity> {
    return ThrowingCustomizer { http -> http
        .authorizeHttpRequests { requests -> requests
            .requestMatchers("/admins/**").hasRole("ADMIN")
        }
    }
}

(3)

@Bean
fun contentSecurityPolicy(): Customizer<HeadersConfigurer<HttpSecurity>> {
    return Customizer { headers -> headers
        .contentSecurityPolicy { csp -> csp
            .policyDirectives("object-src 'none'")
        }
    }
}

@Bean
fun contentTypeOptions(): Customizer<HeadersConfigurer<HttpSecurity>> {
    return Customizer { headers -> headers
        .contentTypeOptions(Customizer.withDefaults())
    }
}

@Bean
fun httpsRedirect(): Customizer<HttpsRedirectConfigurer<HttpSecurity>> {
    return Customizer.withDefaults<HttpsRedirectConfigurer<HttpSecurity>>()
}
1 First all Customizer<HttpSecurity> instances are applied. The adminAuthorization Bean has the highest @Order so it is applied first. If there are no @Order annotations on the Customizer<HttpSecurity> Beans or the @Order annotations had the same value, then the order that the Customizer<HttpSecurity> instances are applied is undefined.
2 The userAuthorization is applied next due to being an instance of Customizer<HttpSecurity>
3 The order that the Customizer types are undefined. In this example, the order of contentSecurityPolicy, contentTypeOptions, and httpsRedirect are undefined. If @Order(Ordered.HIGHEST_PRECEDENCE) was added to contentTypeOptions, then we would know that contentTypeOptions is before contentSecurityPolicy (they are the same type), but we do not know if httpsRedirect is before or after the Customizer<HeadersConfigurer<HttpSecurity>> Beans.
4 After all of the Customizer Beans are applied, the HttpSecurity is passed in as a Bean.

Post Processing Configured Objects

Spring Security’s Java configuration does not expose every property of every object that it configures. This simplifies the configuration for a majority of users. After all, if every property were exposed, users could use standard bean configuration.

While there are good reasons to not directly expose every property, users may still need more advanced configuration options. To address this issue, Spring Security introduces the concept of an ObjectPostProcessor, which can be used to modify or replace many of the Object instances created by the Java Configuration. For example, to configure the filterSecurityPublishAuthorizationSuccess property on FilterSecurityInterceptor, you can use the following:

@Bean
public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
	http
		.authorizeHttpRequests((authorize) -> authorize
			.anyRequest().authenticated()
			.withObjectPostProcessor(new ObjectPostProcessor<FilterSecurityInterceptor>() {
				public <O extends FilterSecurityInterceptor> O postProcess(
						O fsi) {
					fsi.setPublishAuthorizationSuccess(true);
					return fsi;
				}
			})
		);
	return http.build();
}