Add GraalVM native image support for Fabric8 autoconfig module

Signed-off-by: Abu Hena Mostafa Kamal <kamalcis@gmail.com>

Author: kamalcis

spring-cloud-kubernetes-fabric8-autoconfig/src/main/java/org/springframework/cloud/kubernetes/fabric8/Fabric8AutoConfiguration.java

@@ -32,6 +32,7 @@
 import org.springframework.cloud.kubernetes.commons.KubernetesNamespaceProvider;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.core.env.Environment;
 
 /**
@@ -41,6 +42,7 @@
  * @author Eddú Meléndez
  * @author Tim Ysewyn
  */
+@ImportRuntimeHints(Fabric8RuntimeHints.class)
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnCloudPlatform(CloudPlatform.KUBERNETES)
 @AutoConfigureAfter(KubernetesCommonsAutoConfiguration.class)

spring-cloud-kubernetes-fabric8-autoconfig/src/main/java/org/springframework/cloud/kubernetes/fabric8/Fabric8RuntimeHints.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2013-present 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.
+ * 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 org.springframework.cloud.kubernetes.fabric8;
+
+import io.fabric8.kubernetes.client.Config;
+import io.fabric8.kubernetes.client.KubernetesClientBuilder;
+import io.fabric8.kubernetes.client.impl.KubernetesClientImpl;
+
+import org.springframework.aot.hint.MemberCategory;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.aot.hint.TypeReference;
+
+/**
+ * {@link RuntimeHintsRegistrar} for Spring Cloud Kubernetes Fabric8 native image support.
+ *
+ * Registers reflection, resource, and proxy hints required for GraalVM native image
+ * compilation when using the Fabric8 Kubernetes client with Spring Cloud Kubernetes.
+ *
+ * @author Abu Hena Mostafa Kamal
+ */
+public class Fabric8RuntimeHints implements RuntimeHintsRegistrar {
+
+	@Override
+	public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+		// Fabric8 client impl - loaded reflectively via KubernetesClientBuilder
+		hints.reflection()
+			.registerType(TypeReference.of(KubernetesClientImpl.class), MemberCategory.INVOKE_DECLARED_CONSTRUCTORS,
+					MemberCategory.INVOKE_DECLARED_METHODS, MemberCategory.ACCESS_DECLARED_FIELDS);
+
+		// KubernetesClientBuilder - used in Fabric8AutoConfiguration
+		hints.reflection()
+			.registerType(TypeReference.of(KubernetesClientBuilder.class), MemberCategory.INVOKE_DECLARED_CONSTRUCTORS,
+					MemberCategory.INVOKE_DECLARED_METHODS);
+
+		// Fabric8 Config - used in Fabric8AutoConfiguration
+		hints.reflection()
+			.registerType(TypeReference.of(Config.class), MemberCategory.INVOKE_DECLARED_CONSTRUCTORS,
+					MemberCategory.INVOKE_DECLARED_METHODS, MemberCategory.ACCESS_DECLARED_FIELDS);
+
+		// EnvironmentPostProcessor loaded via spring.factories
+		hints.reflection()
+			.registerType(TypeReference.of(Fabric8ProfileEnvironmentPostProcessor.class),
+					MemberCategory.INVOKE_DECLARED_CONSTRUCTORS);
+
+		// Kubernetes service account and kubeconfig resources
+		hints.resources().registerPattern(".kube/config");
+		hints.resources().registerPattern("var/run/secrets/kubernetes.io/serviceaccount/token");
+		hints.resources().registerPattern("var/run/secrets/kubernetes.io/serviceaccount/ca.crt");
+		hints.resources().registerPattern("var/run/secrets/kubernetes.io/serviceaccount/namespace");
+
+	}
+
+}

spring-cloud-kubernetes-fabric8-autoconfig/src/main/resources/META-INF/spring/aot.factories

@@ -0,0 +1,2 @@
+org.springframework.aot.hint.RuntimeHintsRegistrar=\
+org.springframework.cloud.kubernetes.fabric8.Fabric8RuntimeHints