Upgrade to GraphQL Java 19.0

This new release makes the request `Locale` mandatory.

Closes gh-444

build.gradle

@@ -5,7 +5,7 @@ plugins {
 
 ext {
 	moduleProjects = [project(":spring-graphql"), project(":spring-graphql-test")]
-	graphQlJavaVersion = "18.2"
+	graphQlJavaVersion = "19.0"
 	bootVersion = "3.0.0-SNAPSHOT"
 }
 

spring-graphql/src/main/java/org/springframework/graphql/support/DefaultExecutionGraphQlRequest.java

@@ -50,7 +50,6 @@ public class DefaultExecutionGraphQlRequest extends DefaultGraphQlRequest implem
 	@Nullable
 	private ExecutionId executionId;
 
-	@Nullable
 	private final Locale locale;
 
 	private final List<BiFunction<ExecutionInput, ExecutionInput.Builder, ExecutionInput>> executionInputConfigurers = new ArrayList<>();
@@ -73,7 +72,7 @@ public class DefaultExecutionGraphQlRequest extends DefaultGraphQlRequest implem
 		super(document, operationName, variables, extensions);
 		Assert.notNull(id, "'id' is required");
 		this.id = id;
-		this.locale = locale;
+		this.locale = (locale != null) ? locale : Locale.getDefault();
 	}
 
 
@@ -95,7 +94,6 @@ public class DefaultExecutionGraphQlRequest extends DefaultGraphQlRequest implem
 	}
 
 	@Override
-	@Nullable
 	public Locale getLocale() {
 		return this.locale;
 	}

spring-graphql/src/test/java/org/springframework/graphql/DefaultExecutionGraphQlRequestTests.java

@@ -16,6 +16,8 @@
 
 package org.springframework.graphql;
 
+import java.util.Locale;
+
 import graphql.execution.ExecutionId;
 import org.junit.jupiter.api.Test;
 
@@ -46,4 +48,9 @@ class DefaultExecutionGraphQlRequestTests {
 		assertThat(this.request.toExecutionInput().getExecutionId()).isEqualTo(customId);
 	}
 
+	@Test
+	void shouldHaveDefaultLocale() {
+		assertThat(this.request.getLocale()).isEqualTo(Locale.getDefault());
+	}
+
 }

spring-graphql/src/test/java/org/springframework/graphql/data/query/QuerydslDataFetcherTests.java

@@ -20,6 +20,7 @@ import java.net.URI;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.Locale;
 import java.util.Optional;
 import java.util.function.Consumer;
 import java.util.stream.Collectors;
@@ -294,7 +295,7 @@ class QuerydslDataFetcherTests {
 
 	private WebGraphQlRequest request(String query) {
 		return new WebGraphQlRequest(
-				URI.create("/"), new HttpHeaders(), Collections.singletonMap("query", query), "1", null);
+				URI.create("/"), new HttpHeaders(), Collections.singletonMap("query", query), "1", Locale.ENGLISH);
 	}
 
 

spring-graphql/src/testFixtures/java/org/springframework/graphql/TestExecutionRequest.java

@@ -16,6 +16,7 @@
 
 package org.springframework.graphql;
 
+import java.util.Locale;
 import java.util.concurrent.atomic.AtomicLong;
 
 import org.springframework.graphql.support.DefaultExecutionGraphQlRequest;
@@ -32,7 +33,7 @@ public class TestExecutionRequest extends DefaultExecutionGraphQlRequest {
 
 
 	private TestExecutionRequest(String document) {
-		super(document, null, null, null, String.valueOf(idIndex.incrementAndGet()), null);
+		super(document, null, null, null, String.valueOf(idIndex.incrementAndGet()), Locale.ENGLISH);
 	}