Configure additional GraphQL schema files

Prior to this commit, the GraphQL auto-configuration would provide
configuration properties for specifying the locations and file
extensions of schema files to be scanned during startup.

This commit adds a new "spring.graphql.schema.additional-files" that
applications can use to point at particular files, like
"classpath:mylocation/schema.graphqls". These files will be parsed and
considered for the schema in addition to the scanned ones.

Closes spring-projectsgh-42792

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -96,11 +96,15 @@ public GraphQlSource graphQlSource(ResourcePatternResolver resourcePatternResolv
 			ObjectProvider<SubscriptionExceptionResolver> subscriptionExceptionResolvers,
 			ObjectProvider<Instrumentation> instrumentations, ObjectProvider<RuntimeWiringConfigurer> wiringConfigurers,
 			ObjectProvider<GraphQlSourceBuilderCustomizer> sourceCustomizers) {
+
 		String[] schemaLocations = properties.getSchema().getLocations();
-		Resource[] schemaResources = resolveSchemaResources(resourcePatternResolver, schemaLocations,
-				properties.getSchema().getFileExtensions());
+		List<Resource> schemaResources = new ArrayList<>();
+		schemaResources.addAll(resolveSchemaResources(resourcePatternResolver, schemaLocations,
+				properties.getSchema().getFileExtensions()));
+		schemaResources.addAll(Arrays.asList(properties.getSchema().getAdditionalFiles()));
+
 		GraphQlSource.SchemaResourceBuilder builder = GraphQlSource.schemaResourceBuilder()
-			.schemaResources(schemaResources)
+			.schemaResources(schemaResources.toArray(new Resource[0]))
 			.exceptionResolvers(exceptionResolvers.orderedStream().toList())
 			.subscriptionExceptionResolvers(subscriptionExceptionResolvers.orderedStream().toList())
 			.instrumentation(instrumentations.orderedStream().toList());
@@ -116,15 +120,15 @@ public GraphQlSource graphQlSource(ResourcePatternResolver resourcePatternResolv
 		return builder.build();
 	}
 
-	private Resource[] resolveSchemaResources(ResourcePatternResolver resolver, String[] locations,
+	private List<Resource> resolveSchemaResources(ResourcePatternResolver resolver, String[] locations,
 			String[] extensions) {
 		List<Resource> resources = new ArrayList<>();
 		for (String location : locations) {
 			for (String extension : extensions) {
 				resources.addAll(resolveSchemaResources(resolver, location + "*" + extension));
 			}
 		}
-		return resources.toArray(new Resource[0]);
+		return resources;
 	}
 
 	private List<Resource> resolveSchemaResources(ResourcePatternResolver resolver, String pattern) {

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -20,6 +20,7 @@
 import java.util.Arrays;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.core.io.Resource;
 
 /**
  * {@link ConfigurationProperties Properties} for Spring GraphQL.
@@ -85,6 +86,11 @@ public static class Schema {
 		 */
 		private String[] fileExtensions = new String[] { ".graphqls", ".gqls" };
 
+		/**
+		 * Locations of additional, individual schema files to parse.
+		 */
+		private Resource[] additionalFiles = new Resource[0];
+
 		private final Inspection inspection = new Inspection();
 
 		private final Introspection introspection = new Introspection();
@@ -107,6 +113,14 @@ public void setFileExtensions(String[] fileExtensions) {
 			this.fileExtensions = fileExtensions;
 		}
 
+		public Resource[] getAdditionalFiles() {
+			return this.additionalFiles;
+		}
+
+		public void setAdditionalFiles(Resource[] additionalFiles) {
+			this.additionalFiles = additionalFiles;
+		}
+
 		private String[] appendSlashIfNecessary(String[] locations) {
 			return Arrays.stream(locations)
 				.map((location) -> location.endsWith("/") ? location : location + "/")

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -110,6 +110,19 @@ void shouldScanLocationsWithCustomExtension() {
 			});
 	}
 
+	@Test
+	void shouldConfigureAdditionalSchemaFiles() {
+		this.contextRunner
+			.withPropertyValues("spring.graphql.schema.additional-files=classpath:graphql/types/person.custom")
+			.run((context) -> {
+				assertThat(context).hasSingleBean(GraphQlSource.class);
+				GraphQlSource graphQlSource = context.getBean(GraphQlSource.class);
+				GraphQLSchema schema = graphQlSource.schema();
+				assertThat(schema.getObjectType("Book")).isNotNull();
+				assertThat(schema.getObjectType("Person")).isNotNull();
+			});
+	}
+
 	@Test
 	void shouldBackOffWithCustomGraphQlSource() {
 		this.contextRunner.withUserConfiguration(CustomGraphQlSourceConfiguration.class).run((context) -> {