Add Order annotation to GraphQL RouterFunction beans

Update GraphQL auto-configuration so that `RouterFunction` beans have
and `@Order` of 0.

Fixes gh-31314

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/graphql/reactive/GraphQlWebFluxAutoConfiguration.java

@@ -38,6 +38,7 @@ import org.springframework.boot.autoconfigure.graphql.GraphQlProperties;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.Order;
 import org.springframework.core.log.LogMessage;
 import org.springframework.graphql.ExecutionGraphQlService;
 import org.springframework.graphql.execution.GraphQlSource;
@@ -101,8 +102,9 @@ public class GraphQlWebFluxAutoConfiguration {
 	}
 
 	@Bean
-	public RouterFunction<ServerResponse> graphQlEndpoint(GraphQlHttpHandler httpHandler, GraphQlSource graphQlSource,
-			GraphQlProperties properties) {
+	@Order(0)
+	public RouterFunction<ServerResponse> graphQlRouterFunction(GraphQlHttpHandler httpHandler,
+			GraphQlSource graphQlSource, GraphQlProperties properties) {
 		String path = properties.getPath();
 		logger.info(LogMessage.format("GraphQL endpoint HTTP POST %s", path));
 		RouterFunctions.Builder builder = RouterFunctions.route();

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/graphql/servlet/GraphQlWebMvcAutoConfiguration.java

@@ -41,6 +41,7 @@ import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.Order;
 import org.springframework.core.log.LogMessage;
 import org.springframework.graphql.ExecutionGraphQlService;
 import org.springframework.graphql.execution.GraphQlSource;
@@ -106,6 +107,7 @@ public class GraphQlWebMvcAutoConfiguration {
 	}
 
 	@Bean
+	@Order(0)
 	public RouterFunction<ServerResponse> graphQlRouterFunction(GraphQlHttpHandler httpHandler,
 			GraphQlSource graphQlSource, GraphQlProperties properties) {
 		String path = properties.getPath();

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/graphql/reactive/GraphQlWebFluxAutoConfigurationTests.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.autoconfigure.graphql.reactive;
 
 import java.util.Collections;
+import java.util.Map;
 import java.util.function.Consumer;
 
 import graphql.schema.idl.TypeRuntimeWiring;
@@ -32,6 +33,7 @@ import org.springframework.boot.autoconfigure.web.reactive.WebFluxAutoConfigurat
 import org.springframework.boot.test.context.runner.ReactiveWebApplicationContextRunner;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.Order;
 import org.springframework.graphql.execution.RuntimeWiringConfigurer;
 import org.springframework.graphql.server.WebGraphQlHandler;
 import org.springframework.graphql.server.WebGraphQlInterceptor;
@@ -41,6 +43,7 @@ import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.test.web.reactive.server.WebTestClient;
+import org.springframework.web.reactive.function.server.RouterFunction;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.hamcrest.Matchers.containsString;
@@ -147,6 +150,17 @@ class GraphQlWebFluxAutoConfigurationTests {
 				.run((context) -> assertThat(context).hasSingleBean(GraphQlWebSocketHandler.class));
 	}
 
+	@Test
+	void routerFunctionShouldHaveOrderZero() throws Exception {
+		this.contextRunner.withUserConfiguration(CustomRouterFunctions.class).run((context) -> {
+			Map<String, ?> beans = context.getBeansOfType(RouterFunction.class);
+			Object[] ordered = context.getBeanProvider(RouterFunction.class).orderedStream().toArray();
+			assertThat(beans.get("before")).isSameAs(ordered[0]);
+			assertThat(beans.get("graphQlRouterFunction")).isSameAs(ordered[1]);
+			assertThat(beans.get("after")).isSameAs(ordered[2]);
+		});
+	}
+
 	private void testWithWebClient(Consumer<WebTestClient> consumer) {
 		this.contextRunner.run((context) -> {
 			WebTestClient client = WebTestClient.bindToApplicationContext(context).configureClient()
@@ -180,4 +194,21 @@ class GraphQlWebFluxAutoConfigurationTests {
 
 	}
 
+	@Configuration
+	static class CustomRouterFunctions {
+
+		@Bean
+		@Order(-1)
+		RouterFunction<?> before() {
+			return (r) -> null;
+		}
+
+		@Bean
+		@Order(1)
+		RouterFunction<?> after() {
+			return (r) -> null;
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/graphql/servlet/GraphQlWebMvcAutoConfigurationTests.java

@@ -16,6 +16,8 @@
 
 package org.springframework.boot.autoconfigure.graphql.servlet;
 
+import java.util.Map;
+
 import graphql.schema.idl.TypeRuntimeWiring;
 import org.hamcrest.Matchers;
 import org.junit.jupiter.api.Test;
@@ -30,6 +32,7 @@ import org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguratio
 import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.Order;
 import org.springframework.graphql.execution.RuntimeWiringConfigurer;
 import org.springframework.graphql.server.WebGraphQlHandler;
 import org.springframework.graphql.server.WebGraphQlInterceptor;
@@ -40,6 +43,7 @@ import org.springframework.http.MediaType;
 import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.test.web.servlet.MvcResult;
 import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+import org.springframework.web.servlet.function.RouterFunction;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.asyncDispatch;
@@ -153,6 +157,17 @@ class GraphQlWebMvcAutoConfigurationTests {
 				.run((context) -> assertThat(context).hasSingleBean(GraphQlWebSocketHandler.class));
 	}
 
+	@Test
+	void routerFunctionShouldHaveOrderZero() throws Exception {
+		this.contextRunner.withUserConfiguration(CustomRouterFunctions.class).run((context) -> {
+			Map<String, ?> beans = context.getBeansOfType(RouterFunction.class);
+			Object[] ordered = context.getBeanProvider(RouterFunction.class).orderedStream().toArray();
+			assertThat(beans.get("before")).isSameAs(ordered[0]);
+			assertThat(beans.get("graphQlRouterFunction")).isSameAs(ordered[1]);
+			assertThat(beans.get("after")).isSameAs(ordered[2]);
+		});
+	}
+
 	private void testWith(MockMvcConsumer mockMvcConsumer) {
 		this.contextRunner.run((context) -> {
 			MockMvc mockMvc = MockMvcBuilders.webAppContextSetup(context).defaultRequest(
@@ -190,4 +205,21 @@ class GraphQlWebMvcAutoConfigurationTests {
 
 	}
 
+	@Configuration
+	static class CustomRouterFunctions {
+
+		@Bean
+		@Order(-1)
+		RouterFunction<?> before() {
+			return (r) -> null;
+		}
+
+		@Bean
+		@Order(1)
+		RouterFunction<?> after() {
+			return (r) -> null;
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-docs/src/docs/asciidoc/web/spring-graphql.adoc

@@ -83,7 +83,11 @@ are detected by Spring Boot and considered as candidates for `DataFetcher` for m
 
 [[web.graphql.transports.http-websocket]]
 ==== HTTP and WebSocket
-The GraphQL HTTP endpoint is at HTTP POST "/graphql" by default. The path can be customized with configprop:spring.graphql.path[].
+The GraphQL HTTP endpoint is at HTTP POST "/graphql" by default.
+The path can be customized with configprop:spring.graphql.path[].
+
+TIP: The HTTP endpoint for both Spring MVC and Spring WebFlux is provided by a `RouterFunction` bean with an `@Order` or `0`.
+If you define your own `RouterFunction` beans, you may want to add appropriate `@Order` annotations to ensure that they are sorted correctly.
 
 The GraphQL WebSocket endpoint is off by default. To enable it: