Merge branch '6.1.x'

config/src/main/java/org/springframework/security/config/annotation/web/AbstractRequestMatcherRegistry.java

@@ -23,12 +23,14 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicReference;
-import java.util.function.Supplier;
+import java.util.function.Function;
 
 import jakarta.servlet.DispatcherType;
 import jakarta.servlet.ServletContext;
 import jakarta.servlet.ServletRegistration;
 import jakarta.servlet.http.HttpServletRequest;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.context.ApplicationContext;
@@ -44,7 +46,6 @@ import org.springframework.security.web.util.matcher.RegexRequestMatcher;
 import org.springframework.security.web.util.matcher.RequestMatcher;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
-import org.springframework.util.function.SingletonSupplier;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.servlet.handler.HandlerMappingIntrospector;
 
@@ -76,6 +77,8 @@ public abstract class AbstractRequestMatcherRegistry<C> {
 				AbstractRequestMatcherRegistry.class.getClassLoader());
 	}
 
+	private final Log logger = LogFactory.getLog(getClass());
+
 	protected final void setApplicationContext(ApplicationContext context) {
 		this.context = context;
 	}
@@ -209,7 +212,12 @@ public abstract class AbstractRequestMatcherRegistry<C> {
 				matchers.add(resolve(ant, mvc, servletContext));
 			}
 			else {
-				matchers.add(new DeferredRequestMatcher(() -> resolve(ant, mvc, servletContext), mvc, ant));
+				this.logger
+					.warn("The ServletRegistration API was not available at startup time. This may be due to a misconfiguration; "
+							+ "if you are using AbstractSecurityWebApplicationInitializer, please double-check the recommendations outlined in "
+							+ "https://docs.spring.io/spring-security/reference/servlet/configuration/java.html#abstractsecuritywebapplicationinitializer-with-spring-mvc");
+				matchers.add(new DeferredRequestMatcher((request) -> resolve(ant, mvc, request.getServletContext()),
+						mvc, ant));
 			}
 		}
 		return requestMatchers(matchers.toArray(new RequestMatcher[0]));
@@ -466,27 +474,34 @@ public abstract class AbstractRequestMatcherRegistry<C> {
 
 	static class DeferredRequestMatcher implements RequestMatcher {
 
-		final Supplier<RequestMatcher> requestMatcher;
+		final Function<HttpServletRequest, RequestMatcher> requestMatcherFactory;
 
 		final AtomicReference<String> description = new AtomicReference<>();
 
-		DeferredRequestMatcher(Supplier<RequestMatcher> resolver, RequestMatcher... candidates) {
-			this.requestMatcher = SingletonSupplier.of(() -> {
-				RequestMatcher matcher = resolver.get();
-				this.description.set(matcher.toString());
-				return matcher;
-			});
+		volatile RequestMatcher requestMatcher;
+
+		DeferredRequestMatcher(Function<HttpServletRequest, RequestMatcher> resolver, RequestMatcher... candidates) {
+			this.requestMatcherFactory = (request) -> {
+				if (this.requestMatcher == null) {
+					synchronized (this) {
+						if (this.requestMatcher == null) {
+							this.requestMatcher = resolver.apply(request);
+						}
+					}
+				}
+				return this.requestMatcher;
+			};
 			this.description.set("Deferred " + Arrays.toString(candidates));
 		}
 
 		@Override
 		public boolean matches(HttpServletRequest request) {
-			return this.requestMatcher.get().matches(request);
+			return this.requestMatcherFactory.apply(request).matches(request);
 		}
 
 		@Override
 		public MatchResult matcher(HttpServletRequest request) {
-			return this.requestMatcher.get().matcher(request);
+			return this.requestMatcherFactory.apply(request).matcher(request);
 		}
 
 		@Override

config/src/test/java/org/springframework/security/config/annotation/web/AbstractRequestMatcherRegistryTests.java

@@ -307,7 +307,7 @@ public class AbstractRequestMatcherRegistryTests {
 			List<RequestMatcher> requestMatchers = new ArrayList<>();
 			for (RequestMatcher requestMatcher : wrappedMatchers) {
 				if (requestMatcher instanceof AbstractRequestMatcherRegistry.DeferredRequestMatcher) {
-					requestMatchers.add(((DeferredRequestMatcher) requestMatcher).requestMatcher.get());
+					requestMatchers.add(((DeferredRequestMatcher) requestMatcher).requestMatcher);
 				}
 				else {
 					requestMatchers.add(requestMatcher);

docs/modules/ROOT/pages/servlet/configuration/java.adoc

@@ -114,7 +114,7 @@ public class SecurityWebApplicationInitializer
 
 This onlys register 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 `getRootConfigClasses()`:
+For example, if we use Spring MVC it is added in the `getServletConfigClasses()`:
 
 [[message-web-application-inititializer-java]]
 [source,java]
@@ -123,14 +123,42 @@ public class MvcWebApplicationInitializer extends
 		AbstractAnnotationConfigDispatcherServletInitializer {
 
 	@Override
-	protected Class<?>[] getRootConfigClasses() {
-		return new Class[] { WebSecurityConfig.class };
+	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 xref:servlet/authorization/authorize-http-requests.adoc#_request_matchers[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 `HandlerMappingIntrospector`.
+
+==== 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:
+
+[source,java]
+----
+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.
+
 [[jc-httpsecurity]]
 == HttpSecurity