Remove reassignments for builders in GraphQL auto-configurations

See gh-40590

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -112,15 +112,15 @@ public class GraphQlWebFluxAutoConfiguration {
 		String path = properties.getPath();
 		logger.info(LogMessage.format("GraphQL endpoint HTTP POST %s", path));
 		RouterFunctions.Builder builder = RouterFunctions.route();
-		builder = builder.GET(path, this::onlyAllowPost);
+		builder.GET(path, this::onlyAllowPost);
-		builder = builder.POST(path, SUPPORTS_MEDIATYPES, httpHandler::handleRequest);
+		builder.POST(path, SUPPORTS_MEDIATYPES, httpHandler::handleRequest);
 		if (properties.getGraphiql().isEnabled()) {
 			GraphiQlHandler graphQlHandler = new GraphiQlHandler(path, properties.getWebsocket().getPath());
-			builder = builder.GET(properties.getGraphiql().getPath(), graphQlHandler::handleRequest);
+			builder.GET(properties.getGraphiql().getPath(), graphQlHandler::handleRequest);
 		}
 		if (properties.getSchema().getPrinter().isEnabled()) {
 			SchemaHandler schemaHandler = new SchemaHandler(graphQlSource);
-			builder = builder.GET(path + "/schema", schemaHandler::handleRequest);
+			builder.GET(path + "/schema", schemaHandler::handleRequest);
 		}
 		return builder.build();
 	}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -112,16 +112,16 @@ public class GraphQlWebMvcAutoConfiguration {
 		String path = properties.getPath();
 		logger.info(LogMessage.format("GraphQL endpoint HTTP POST %s", path));
 		RouterFunctions.Builder builder = RouterFunctions.route();
-		builder = builder.GET(path, this::onlyAllowPost);
+		builder.GET(path, this::onlyAllowPost);
-		builder = builder.POST(path, RequestPredicates.contentType(MediaType.APPLICATION_JSON)
+		builder.POST(path, RequestPredicates.contentType(MediaType.APPLICATION_JSON)
 			.and(RequestPredicates.accept(SUPPORTED_MEDIA_TYPES)), httpHandler::handleRequest);
 		if (properties.getGraphiql().isEnabled()) {
 			GraphiQlHandler graphiQLHandler = new GraphiQlHandler(path, properties.getWebsocket().getPath());
-			builder = builder.GET(properties.getGraphiql().getPath(), graphiQLHandler::handleRequest);
+			builder.GET(properties.getGraphiql().getPath(), graphiQLHandler::handleRequest);
 		}
 		if (properties.getSchema().getPrinter().isEnabled()) {
 			SchemaHandler schemaHandler = new SchemaHandler(graphQlSource);
-			builder = builder.GET(path + "/schema", schemaHandler::handleRequest);
+			builder.GET(path + "/schema", schemaHandler::handleRequest);
 		}
 		return builder.build();
 	}