Fix invalid syntax for JDK8

Author: bclozel

spring-graphql/src/main/java/org/springframework/graphql/server/WebGraphQlRequest.java

@@ -69,7 +69,7 @@ public WebGraphQlRequest(
 
 private static String getQuery(Map<String, Object> body) {
 Object value = body.get("query");
-if (!(value instanceof String query) || !StringUtils.hasText(query)) {
+if (!(value instanceof String) || !StringUtils.hasText((String) value)) {
 throw new ServerWebInputException("Invalid value for 'query'");
 }
 return (String) value;

spring-graphql/src/test/java/org/springframework/graphql/server/WebGraphQlRequestTests.java

@@ -18,6 +18,7 @@
 
 import java.net.URI;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.Map;
 
 import org.junit.jupiter.api.Test;
@@ -37,18 +38,28 @@ public class WebGraphQlRequestTests {
 
 @Test // gh-726
 void invalidBody() {
-testInvalidBody(Map.of());
-testInvalidBody(Map.of("query", Collections.emptyMap()));
-testInvalidBody(Map.of("query", "query { foo }", "operation", Collections.emptyMap()));
-testInvalidBody(Map.of("query", "query { foo }", "variables", "not-a-map"));
-testInvalidBody(Map.of("query", "query { foo }", "extensions", "not-a-map"));
+testInvalidBody(new HashMap<>());
+Map<String, Object> empty = new HashMap<>();
+empty.put("query", Collections.emptyMap());
+testInvalidBody(empty);
+Map<String, Object> emptyOperations = new HashMap<>();
+emptyOperations.put("query", "query { foo }");
+emptyOperations.put("operation", Collections.emptyMap());
+testInvalidBody(emptyOperations);
+Map<String, Object> invalidVariables = new HashMap<>();
+invalidVariables.put("query", "query { foo }");
+invalidVariables.put("variables", "not-a-map");
+testInvalidBody(invalidVariables);
+Map<String, Object> invalidExtensions = new HashMap<>();
+invalidExtensions.put("query", "query { foo }");
+invalidExtensions.put("extensions", "not-a-map");
+testInvalidBody(invalidExtensions);
 }
 
 private void testInvalidBody(Map<String, Object> body) {
 assertThatThrownBy(() ->
 new WebGraphQlRequest(
-URI.create("/graphql"), new HttpHeaders(), new LinkedMultiValueMap<>(),
-Collections.emptyMap(), body, "1", null))
+URI.create("/graphql"), new HttpHeaders(), body, "1", null))
 .isInstanceOf(ServerWebInputException.class);
 }