Polishing

spring-beans/src/test/java/org/springframework/beans/factory/config/YamlProcessorTests.java

@@ -141,6 +141,7 @@ class YamlProcessorTests {
 	}
 
 	@Test
+	@SuppressWarnings("unchecked")
 	void standardTypesSupportedByDefault() throws Exception {
 		setYaml("value: !!set\n  ? first\n  ? second");
 		this.processor.process((properties, map) -> {

spring-jms/src/main/java/org/springframework/jms/connection/CachingConnectionFactory.java

@@ -423,6 +423,7 @@ public class CachingConnectionFactory extends SingleConnectionFactory {
 			return new CachedMessageProducer(producer);
 		}
 
+		@SuppressWarnings("resource")
 		private MessageConsumer getCachedConsumer(Destination dest, @Nullable String selector,
 				@Nullable Boolean noLocal, @Nullable String subscription, boolean durable) throws JMSException {
 

spring-webflux/src/main/java/org/springframework/web/reactive/socket/adapter/Jetty10WebSocketHandlerAdapter.java

@@ -48,9 +48,6 @@ import org.springframework.web.reactive.socket.WebSocketSession;
 @WebSocket
 public class Jetty10WebSocketHandlerAdapter {
 
-	private static final ByteBuffer EMPTY_PAYLOAD = ByteBuffer.wrap(new byte[0]);
-
-
 	private final WebSocketHandler delegateHandler;
 
 	private final Function<Session, JettyWebSocketSession> sessionFactory;
@@ -97,7 +94,9 @@ public class Jetty10WebSocketHandlerAdapter {
 // TODO: onWebSocketFrame can't be declared without compiling against Jetty 10
 //   Jetty 10: org.eclipse.jetty.websocket.api.Frame
 //   Jetty  9: org.eclipse.jetty.websocket.api.extensions.Frame
-
+//
+// private static final ByteBuffer EMPTY_PAYLOAD = ByteBuffer.wrap(new byte[0]);
+//
 //	@OnWebSocketFrame
 //	public void onWebSocketFrame(Frame frame) {
 //		if (this.delegateSession != null) {

spring-webmvc/src/test/java/org/springframework/web/servlet/function/SseServerResponseTests.java

 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -90,8 +90,7 @@ class SseServerResponseTests {
 	}
 
 	@Test
-	public void builder() throws Exception {
-		String body = "foo bar";
+	void builder() throws Exception {
 		ServerResponse response = ServerResponse.sse(sse -> {
 			try {
 				sse.id("id")
@@ -132,14 +131,15 @@ class SseServerResponseTests {
 			this.age = age;
 		}
 
+		@SuppressWarnings("unused")
 		public String getName() {
 			return this.name;
 		}
 
+		@SuppressWarnings("unused")
 		public int getAge() {
 			return this.age;
 		}
 	}
 
-
 }

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/PrincipalMethodArgumentResolverTests.java

 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -30,7 +30,6 @@ import org.junit.jupiter.api.Test;
 
 import org.springframework.core.MethodParameter;
 import org.springframework.web.context.request.ServletWebRequest;
-import org.springframework.web.method.support.ModelAndViewContainer;
 import org.springframework.web.testfixture.servlet.MockHttpServletRequest;
 import org.springframework.web.testfixture.servlet.MockHttpServletResponse;
 
@@ -41,32 +40,25 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class PrincipalMethodArgumentResolverTests {
+class PrincipalMethodArgumentResolverTests {
 
-	private PrincipalMethodArgumentResolver resolver;
+	private PrincipalMethodArgumentResolver resolver = new PrincipalMethodArgumentResolver();
 
-	private ModelAndViewContainer mavContainer;
+	private MockHttpServletRequest servletRequest = new MockHttpServletRequest("GET", "");
 
-	private MockHttpServletRequest servletRequest;
-
-	private ServletWebRequest webRequest;
+	private ServletWebRequest webRequest = new ServletWebRequest(servletRequest, new MockHttpServletResponse());
 
 	private Method method;
 
 
 	@BeforeEach
-	public void setup() throws Exception {
-		resolver = new PrincipalMethodArgumentResolver();
-		mavContainer = new ModelAndViewContainer();
-		servletRequest = new MockHttpServletRequest("GET", "");
-		webRequest = new ServletWebRequest(servletRequest, new MockHttpServletResponse());
-
+	void setup() throws Exception {
 		method = getClass().getMethod("supportedParams", ServletRequest.class, Principal.class);
 	}
 
 
 	@Test
-	public void principal() throws Exception {
+	void principal() throws Exception {
 		Principal principal = () -> "Foo";
 		servletRequest.setUserPrincipal(principal);
 
@@ -78,7 +70,7 @@ public class PrincipalMethodArgumentResolverTests {
 	}
 
 	@Test
-	public void principalAsNull() throws Exception {
+	void principalAsNull() throws Exception {
 		MethodParameter principalParameter = new MethodParameter(method, 1);
 		assertThat(resolver.supportsParameter(principalParameter)).as("Principal not supported").isTrue();
 
@@ -87,7 +79,7 @@ public class PrincipalMethodArgumentResolverTests {
 	}
 
 	@Test // gh-25780
-	public void annotatedPrincipal() throws Exception {
+	void annotatedPrincipal() throws Exception {
 		Principal principal = () -> "Foo";
 		servletRequest.setUserPrincipal(principal);
 		Method principalMethod = getClass().getMethod("supportedParamsWithAnnotatedPrincipal", Principal.class);

spring-webmvc/src/test/java/org/springframework/web/servlet/resource/ResourceUrlProviderTests.java

@@ -151,6 +151,7 @@ public class ResourceUrlProviderTests {
 	}
 
 	@Test
+	@SuppressWarnings("resource")
 	void initializeOnCurrentContext() {
 		AnnotationConfigWebApplicationContext parentContext = new AnnotationConfigWebApplicationContext();
 		parentContext.setServletContext(new MockServletContext());