diff --git a/spring-graphql/src/main/java/org/springframework/graphql/execution/AbstractGraphQlSourceBuilder.java b/spring-graphql/src/main/java/org/springframework/graphql/execution/AbstractGraphQlSourceBuilder.java
index 0698e48d..6aefeaa5 100644
--- a/spring-graphql/src/main/java/org/springframework/graphql/execution/AbstractGraphQlSourceBuilder.java
+++ b/spring-graphql/src/main/java/org/springframework/graphql/execution/AbstractGraphQlSourceBuilder.java
@@ -149,27 +149,7 @@ abstract class AbstractGraphQlSourceBuilder<B extends GraphQlSource.Builder<B>>
 	/**
 	 * {@link GraphQlSource} with fixed {@link GraphQL} and {@link GraphQLSchema} instances.
 	 */
-	private static class FixedGraphQlSource implements GraphQlSource {
-
-		private final GraphQL graphQl;
-
-		private final GraphQLSchema schema;
-
-		FixedGraphQlSource(GraphQL graphQl, GraphQLSchema schema) {
-			this.graphQl = graphQl;
-			this.schema = schema;
-		}
-
-		@Override
-		public GraphQL graphQl() {
-			return this.graphQl;
-		}
-
-		@Override
-		public GraphQLSchema schema() {
-			return this.schema;
-		}
-
+	private record FixedGraphQlSource(GraphQL graphQl, GraphQLSchema schema) implements GraphQlSource {
 	}
 
 }
diff --git a/spring-graphql/src/main/java/org/springframework/graphql/execution/DefaultSchemaResourceGraphQlSourceBuilder.java b/spring-graphql/src/main/java/org/springframework/graphql/execution/DefaultSchemaResourceGraphQlSourceBuilder.java
index 57a2689b..ffb94dee 100644
--- a/spring-graphql/src/main/java/org/springframework/graphql/execution/DefaultSchemaResourceGraphQlSourceBuilder.java
+++ b/spring-graphql/src/main/java/org/springframework/graphql/execution/DefaultSchemaResourceGraphQlSourceBuilder.java
@@ -60,7 +60,7 @@ final class DefaultSchemaResourceGraphQlSourceBuilder
 
 	private final Set<Resource> schemaResources = new LinkedHashSet<>();
 
-	private List<TypeDefinitionConfigurer> typeDefinitionConfigurers = new ArrayList<>();
+	private final List<TypeDefinitionConfigurer> typeDefinitionConfigurers = new ArrayList<>();
 
 	private final List<RuntimeWiringConfigurer> runtimeWiringConfigurers = new ArrayList<>();
 
@@ -133,6 +133,9 @@ final class DefaultSchemaResourceGraphQlSourceBuilder
 			}
 		});
 
+		// SchemaMappingInspector needs RuntimeWiring, but cannot run here since type
+		// visitors may transform the schema, for example to add Connection types.
+
 		configureGraphQl(builder -> {
 			GraphQLSchema schema = builder.build().getGraphQLSchema();
 			SchemaMappingInspector.Report report = SchemaMappingInspector.inspect(schema, runtimeWiring);
diff --git a/spring-graphql/src/main/java/org/springframework/graphql/execution/ExternalSchemaGraphQlSourceBuilder.java b/spring-graphql/src/main/java/org/springframework/graphql/execution/ExternalSchemaGraphQlSourceBuilder.java
index d1eefcdf..e4170a95 100644
--- a/spring-graphql/src/main/java/org/springframework/graphql/execution/ExternalSchemaGraphQlSourceBuilder.java
+++ b/spring-graphql/src/main/java/org/springframework/graphql/execution/ExternalSchemaGraphQlSourceBuilder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -29,7 +29,8 @@ import org.springframework.util.Assert;
  * @author Rossen Stoyanchev
  * @since 1.0.0
  */
-final class ExternalSchemaGraphQlSourceBuilder extends AbstractGraphQlSourceBuilder<ExternalSchemaGraphQlSourceBuilder>
+final class ExternalSchemaGraphQlSourceBuilder
+		extends AbstractGraphQlSourceBuilder<ExternalSchemaGraphQlSourceBuilder>
 		implements GraphQlSource.Builder<ExternalSchemaGraphQlSourceBuilder> {
 
 	private final GraphQLSchema schema;