fix: support GraalVM native image for Fabric8 Spring Cloud Kubernetes

Remove @ConstructorBinding from ConfigMapConfigProperties and SecretsConfigProperties as it is not needed in this case.

Register both classes in Fabric8RuntimeHints with INVOKE_DECLARED_CONSTRUCTORS
to ensure GraalVM can construct them at runtime.

Add unit tests for Fabric8RuntimeHints covering reflection hint registrations
for Fabric8 client classes, Kubernetes API resources, and config properties.

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

Author: kamalcis

spring-cloud-kubernetes-commons/src/main/java/org/springframework/cloud/kubernetes/commons/config/ConfigMapConfigProperties.java

@@ -20,7 +20,6 @@
 import java.util.Map;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
-import org.springframework.boot.context.properties.bind.ConstructorBinding;
 import org.springframework.boot.context.properties.bind.DefaultValue;
 
 /**
@@ -37,7 +36,6 @@ public final class ConfigMapConfigProperties extends SourceConfigProperties {
 	 */
 	public static final String PREFIX = "spring.cloud.kubernetes.config";
 
-	@ConstructorBinding
 	public ConfigMapConfigProperties(@DefaultValue("true") boolean enabled, @DefaultValue List<Source> sources,
 			@DefaultValue Map<String, String> labels, String name, String namespace, boolean useNameAsPrefix,
 			@DefaultValue("true") boolean includeProfileSpecificSources, boolean failFast,

spring-cloud-kubernetes-commons/src/main/java/org/springframework/cloud/kubernetes/commons/config/SecretsConfigProperties.java

@@ -20,7 +20,6 @@
 import java.util.Map;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
-import org.springframework.boot.context.properties.bind.ConstructorBinding;
 import org.springframework.boot.context.properties.bind.DefaultValue;
 
 /**
@@ -38,7 +37,6 @@ public final class SecretsConfigProperties extends SourceConfigProperties {
 	 */
 	public static final String PREFIX = "spring.cloud.kubernetes.secrets";
 
-	@ConstructorBinding
 	public SecretsConfigProperties(@DefaultValue("false") boolean enabled, @DefaultValue List<Source> sources,
 			@DefaultValue Map<String, String> labels, String name, String namespace, boolean useNameAsPrefix,
 			@DefaultValue("true") boolean includeProfileSpecificSources, boolean failFast,

spring-cloud-kubernetes-fabric8-autoconfig/src/test/java/org/springframework/cloud/kubernetes/fabric8/Fabric8RuntimeHintsTests.java

@@ -0,0 +1,88 @@
+/*
+ * 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.api.model.ConfigMap;
+import io.fabric8.kubernetes.api.model.ConfigMapList;
+import io.fabric8.kubernetes.api.model.ObjectMeta;
+import io.fabric8.kubernetes.api.model.Secret;
+import io.fabric8.kubernetes.api.model.SecretList;
+import io.fabric8.kubernetes.client.Config;
+import io.fabric8.kubernetes.client.ConfigBuilder;
+import io.fabric8.kubernetes.client.KubernetesClientBuilder;
+import io.fabric8.kubernetes.client.impl.KubernetesClientImpl;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.predicate.RuntimeHintsPredicates;
+import org.springframework.cloud.kubernetes.commons.config.ConfigMapConfigProperties;
+import org.springframework.cloud.kubernetes.commons.config.SecretsConfigProperties;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link Fabric8RuntimeHints}.
+ *
+ * @author Abu Hena Mostafa Kamal
+ * @since 5.0.3
+ */
+class Fabric8RuntimeHintsTests {
+
+	private final Fabric8RuntimeHints hintsRegistrar = new Fabric8RuntimeHints();
+
+	@Test
+	void fabric8ClientClassesShouldBeRegistered() {
+		RuntimeHints hints = new RuntimeHints();
+		hintsRegistrar.registerHints(hints, null);
+
+		assertThat(RuntimeHintsPredicates.reflection().onType(KubernetesClientImpl.class)).accepts(hints);
+		assertThat(RuntimeHintsPredicates.reflection().onType(KubernetesClientBuilder.class)).accepts(hints);
+		assertThat(RuntimeHintsPredicates.reflection().onType(Config.class)).accepts(hints);
+		assertThat(RuntimeHintsPredicates.reflection().onType(ConfigBuilder.class)).accepts(hints);
+	}
+
+	@Test
+	void kubernetesResourcesShouldBeRegistered() {
+		RuntimeHints hints = new RuntimeHints();
+		hintsRegistrar.registerHints(hints, null);
+
+		assertThat(RuntimeHintsPredicates.reflection().onType(ConfigMap.class)).accepts(hints);
+		assertThat(RuntimeHintsPredicates.reflection().onType(ConfigMapList.class)).accepts(hints);
+		assertThat(RuntimeHintsPredicates.reflection().onType(ObjectMeta.class)).accepts(hints);
+		assertThat(RuntimeHintsPredicates.reflection().onType(Secret.class)).accepts(hints);
+		assertThat(RuntimeHintsPredicates.reflection().onType(SecretList.class)).accepts(hints);
+	}
+
+	@Test
+	void configPropertiesShouldBeRegistered() {
+		RuntimeHints hints = new RuntimeHints();
+		hintsRegistrar.registerHints(hints, null);
+
+		assertThat(RuntimeHintsPredicates.reflection().onType(ConfigMapConfigProperties.class)).accepts(hints);
+		assertThat(RuntimeHintsPredicates.reflection().onType(SecretsConfigProperties.class)).accepts(hints);
+	}
+
+	@Test
+	void unrelatedClassesShouldNotBeRegistered() {
+		RuntimeHints hints = new RuntimeHints();
+		hintsRegistrar.registerHints(hints, null);
+
+		assertThat(RuntimeHintsPredicates.reflection().onType(String.class)).rejects(hints);
+		assertThat(RuntimeHintsPredicates.reflection().onType(Integer.class)).rejects(hints);
+	}
+
+}