Add missing org.yaml.snakeyaml.Yaml reflection hint

Closes gh-31441

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/env/PropertySourceRuntimeHintsRegistrar.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2012-2022 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.boot.env;
+
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.aot.hint.TypeReference;
+
+/**
+ * {@link RuntimeHintsRegistrar} implementation for property source support.
+ *
+ * @author Stephane Nicoll
+ */
+class PropertySourceRuntimeHintsRegistrar implements RuntimeHintsRegistrar {
+
+	@Override
+	public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+		hints.reflection().registerTypeIfPresent(classLoader, "org.yaml.snakeyaml.Yaml",
+				hint -> hint.onReachableType(TypeReference.of(YamlPropertySourceLoader.class)));
+	}
+
+}

spring-boot-project/spring-boot/src/main/resources/META-INF/spring/aot.factories

@@ -1,5 +1,6 @@
 org.springframework.aot.hint.RuntimeHintsRegistrar=\
 org.springframework.boot.context.config.ConfigDataLocationRuntimeHintsRegistrar,\
+org.springframework.boot.env.PropertySourceRuntimeHintsRegistrar,\
 org.springframework.boot.logging.logback.LogbackRuntimeHintsRegistrar,\
 org.springframework.boot.WebApplicationType.WebApplicationTypeRuntimeHintsRegistrar