GraphQL should not back off when GrapQlSource is present

Prior to this commit, the GraphQL auto-configuration that defines the
infrastructure beans for base support would only be active when:

* GraphQL schema files are detected in the configured locations
* or if GraphQlSourceBuilderCustomizer beans are present

This would allow some "code first" approaches, but not situations where
developers contribute their own `GraphQlSource`. This commit ensures
that the auto-configuration is processed even if the application only
contributes a custom `GraphQlSource` bean.

Closes spring-projectsgh-33096

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 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.
@@ -34,13 +34,15 @@
 import org.springframework.core.io.support.ResourcePatternResolver;
 import org.springframework.core.io.support.ResourcePatternUtils;
 import org.springframework.core.type.AnnotatedTypeMetadata;
+import org.springframework.graphql.execution.GraphQlSource;
 
 /**
  * {@link Condition} that checks whether a GraphQL schema has been defined in the
  * application. This is looking for:
  * <ul>
  * <li>schema files in the {@link GraphQlProperties configured locations}</li>
- * <li>or infrastructure beans such as {@link GraphQlSourceBuilderCustomizer}</li>
+ * <li>or {@link GraphQlSourceBuilderCustomizer} beans</li>
+ * <li>or a {@link GraphQlSource} bean</li>
  * </ul>
  *
  * @author Brian Clozel
@@ -82,6 +84,14 @@ public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeM
 		else {
 			messages.add((message.didNotFind("GraphQlSourceBuilderCustomizer").atAll()));
 		}
+		String[] graphqlSourceBeans = beanFactory.getBeanNamesForType(GraphQlSource.class, false, false);
+		if (graphqlSourceBeans.length != 0) {
+			match = true;
+			messages.add(message.found("graphqlSource").items(Arrays.asList(graphqlSourceBeans)));
+		}
+		else {
+			messages.add((message.didNotFind("GraphQlSource").atAll()));
+		}
 		return new ConditionOutcome(match, ConditionMessage.of(messages));
 	}
 

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

@@ -124,10 +124,14 @@ void shouldConfigureAdditionalSchemaFiles() {
 	}
 
 	@Test
-	void shouldBackOffWithCustomGraphQlSource() {
+	void shouldUseCustomGraphQlSource() {
 		this.contextRunner.withUserConfiguration(CustomGraphQlSourceConfiguration.class).run((context) -> {
 			assertThat(context).getBeanNames(GraphQlSource.class).containsOnly("customGraphQlSource");
-			assertThat(context).hasSingleBean(GraphQlProperties.class);
+			assertThat(context).hasSingleBean(GraphQlProperties.class)
+				.hasSingleBean(BatchLoaderRegistry.class)
+				.hasSingleBean(ExecutionGraphQlService.class)
+				.hasSingleBean(AnnotatedControllerConfigurer.class)
+				.hasSingleBean(EncodingCursorStrategy.class);
 		});
 	}