chore:add runtime hints for sample test.

spring-cloud-gcp-samples/spring-cloud-gcp-logging-sample/src/test/java/com.example/LoggingSampleApplicationIntegrationTests.java

@@ -40,6 +40,7 @@
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.web.client.TestRestTemplate;
 import org.springframework.boot.test.web.server.LocalServerPort;
+import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
@@ -52,6 +53,7 @@
 @SpringBootTest(
     webEnvironment = WebEnvironment.RANDOM_PORT,
     classes = {Application.class})
+@ImportRuntimeHints(TestRuntimeHints.class)
 class LoggingSampleApplicationIntegrationTests {
 
   private static final String LOG_FILTER_FORMAT =

spring-cloud-gcp-samples/spring-cloud-gcp-logging-sample/src/test/java/com.example/TestRuntimeHints.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example;
+
+import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
+import ch.qos.logback.core.ConsoleAppender;
+import java.util.Arrays;
+import org.springframework.aot.hint.MemberCategory;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.aot.hint.TypeReference;
+
+/** Runtime Hints for GraalVM Native Images * */
+public class TestRuntimeHints implements RuntimeHintsRegistrar {
+  @Override
+  public void registerHints(
+      org.springframework.aot.hint.RuntimeHints hints, ClassLoader classLoader) {
+    hints
+        .reflection()
+        .registerTypes(
+            Arrays.asList(
+                TypeReference.of(ConsoleAppender.class),
+                TypeReference.of(PatternLayoutEncoder.class)),
+            hint ->
+                hint.withMembers(
+                    MemberCategory.INVOKE_DECLARED_CONSTRUCTORS,
+                    MemberCategory.INVOKE_PUBLIC_METHODS));
+    hints.resources().registerPattern("logback-test.xml");
+    hints.resources().registerPattern("com/google/cloud/spring/logging/logback-appender.xml");
+  }
+}