Add nullability annotations to smoke-test/spring-boot-smoke-test-rsocket

See gh-46587

Author: mhalbritter

smoke-test/spring-boot-smoke-test-rsocket/src/main/java/smoketest/rsocket/Project.java

@@ -18,10 +18,7 @@
 
 public class Project {
 
-	private String name;
-
-	public Project() {
-	}
+	private final String name;
 
 	public Project(String name) {
 		this.name = name;
@@ -31,8 +28,4 @@ public String getName() {
 		return this.name;
 	}
 
-	public void setName(String name) {
-		this.name = name;
-	}
-
 }

smoke-test/spring-boot-smoke-test-rsocket/src/main/java/smoketest/rsocket/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * 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.
+ */
+
+@NullMarked
+package smoketest.rsocket;
+
+import org.jspecify.annotations.NullMarked;