Support constructor binding method-level @NestedConfigurationProperty

Update `spring-boot-configuration-processor` to support method-level
`@NestedConfigurationProperty` annotations when constructor binding
is being used.

Fixes gh-49734

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/ConstructorParameterPropertyDescriptor.java

@@ -51,7 +51,8 @@ class ConstructorParameterPropertyDescriptor extends ParameterPropertyDescriptor
 
 	@Override
 	protected boolean isMarkedAsNested(MetadataGenerationEnvironment environment) {
-		return environment.getNestedConfigurationPropertyAnnotation(this.field) != null;
+		return environment.getNestedConfigurationPropertyAnnotation(this.field) != null
+				|| environment.getNestedConfigurationPropertyAnnotation(getGetter()) != null;
 	}
 
 	@Override

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessorTests.java

@@ -27,6 +27,7 @@ import org.springframework.boot.configurationprocessor.metadata.ItemMetadata;
 import org.springframework.boot.configurationprocessor.metadata.Metadata;
 import org.springframework.boot.configurationsample.deprecation.Dbcp2Configuration;
 import org.springframework.boot.configurationsample.method.NestedPropertiesMethod;
+import org.springframework.boot.configurationsample.method.NestedPropertiesMethodImmutable;
 import org.springframework.boot.configurationsample.record.ExampleRecord;
 import org.springframework.boot.configurationsample.record.NestedPropertiesRecord;
 import org.springframework.boot.configurationsample.record.RecordWithGetter;
@@ -394,6 +395,13 @@ class ConfigurationMetadataAnnotationProcessorTests extends AbstractMetadataGene
 		assertThat(metadata).has(Metadata.withProperty("method-nested.inner.nested.my-nested-property"));
 	}
 
+	@Test
+	void nestedClassMethodImmutable() {
+		ConfigurationMetadata metadata = compile(NestedPropertiesMethodImmutable.class);
+		assertThat(metadata).has(Metadata.withGroup("immutable-nested.nested"));
+		assertThat(metadata).has(Metadata.withProperty("immutable-nested.nested.my-nested-property"));
+	}
+
 	@Test
 	void nestedClassChildProperties() {
 		ConfigurationMetadata metadata = compile(ClassWithNestedProperties.class);

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationsample/method/NestedPropertiesMethodImmutable.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2012-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.boot.configurationsample.method;
+
+import org.springframework.boot.configurationsample.TestConfigurationProperties;
+import org.springframework.boot.configurationsample.TestNestedConfigurationProperty;
+
+@TestConfigurationProperties("immutable-nested")
+public class NestedPropertiesMethodImmutable {
+
+	private final NestedProperty nested;
+
+	NestedPropertiesMethodImmutable(NestedProperty nested) {
+		this.nested = nested;
+
+	}
+
+	@TestNestedConfigurationProperty
+	public NestedProperty getNested() {
+		return this.nested;
+	}
+
+}