Clean up warnings in spring-core

spring-core/src/main/java/org/springframework/core/MethodParameter.java

@@ -182,7 +182,7 @@ public class MethodParameter {
 	 */
 	@Nullable
 	public Constructor<?> getConstructor() {
-		return (this.executable instanceof Constructor ? (Constructor) this.executable : null);
+		return (this.executable instanceof Constructor ? (Constructor<?>) this.executable : null);
 	}
 
 	/**
@@ -586,7 +586,7 @@ public class MethodParameter {
 				parameterNames = discoverer.getParameterNames((Method) this.executable);
 			}
 			else if (this.executable instanceof Constructor) {
-				parameterNames = discoverer.getParameterNames((Constructor) this.executable);
+				parameterNames = discoverer.getParameterNames((Constructor<?>) this.executable);
 			}
 			if (parameterNames != null) {
 				this.parameterName = parameterNames[this.parameterIndex];

spring-core/src/main/java/org/springframework/core/convert/TypeDescriptor.java

@@ -251,7 +251,6 @@ public class TypeDescriptor implements Serializable {
 	 * @param annotationType the annotation type
 	 * @return the annotation, or {@code null} if no such annotation exists on this type descriptor
 	 */
-	@SuppressWarnings("unchecked")
 	@Nullable
 	public <T extends Annotation> T getAnnotation(Class<T> annotationType) {
 		if (this.annotatedElement.isEmpty()) {

spring-core/src/main/java/org/springframework/core/convert/support/ObjectToOptionalConverter.java

@@ -76,7 +76,7 @@ final class ObjectToOptionalConverter implements ConditionalGenericConverter {
 		else if (targetType.getResolvableType().hasGenerics()) {
 			Object target = this.conversionService.convert(source, sourceType, new GenericTypeDescriptor(targetType));
 			if (target == null || (target.getClass().isArray() && Array.getLength(target) == 0) ||
-						(target instanceof Collection && ((Collection) target).isEmpty())) {
+						(target instanceof Collection && ((Collection<?>) target).isEmpty())) {
 				return Optional.empty();
 			}
 			return Optional.of(target);

spring-core/src/test/java/org/springframework/core/BridgeMethodResolverTests.java

@@ -18,7 +18,6 @@ package org.springframework.core;
 
 import java.io.Serializable;
 import java.lang.reflect.Method;
-import java.lang.reflect.TypeVariable;
 import java.util.Collection;
 import java.util.Date;
 import java.util.HashMap;
@@ -43,16 +42,6 @@ import static org.junit.Assert.*;
 @SuppressWarnings("rawtypes")
 public class BridgeMethodResolverTests {
 
-	private static TypeVariable<?> findTypeVariable(Class<?> clazz, String name) {
-		TypeVariable<?>[] variables = clazz.getTypeParameters();
-		for (TypeVariable<?> variable : variables) {
-			if (variable.getName().equals(name)) {
-				return variable;
-			}
-		}
-		return null;
-	}
-
 	private static Method findMethodWithReturnType(String name, Class<?> returnType, Class<SettingsDaoImpl> targetType) {
 		Method[] methods = targetType.getMethods();
 		for (Method m : methods) {

spring-core/src/test/java/org/springframework/core/convert/support/ReactiveAdapterRegistryTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.core.convert.support;
 
 import java.time.Duration;
@@ -22,7 +23,6 @@ import java.util.concurrent.CompletableFuture;
 
 import io.reactivex.Flowable;
 import io.reactivex.Maybe;
-import org.junit.Before;
 import org.junit.Test;
 import org.reactivestreams.Publisher;
 import reactor.core.publisher.Flux;
@@ -50,13 +50,7 @@ import static org.junit.Assert.assertTrue;
 @SuppressWarnings("unchecked")
 public class ReactiveAdapterRegistryTests {
 
-	private ReactiveAdapterRegistry registry;
-
-
-	@Before
-	public void setUp() throws Exception {
-		this.registry = new ReactiveAdapterRegistry();
-	}
+	private final ReactiveAdapterRegistry registry = new ReactiveAdapterRegistry();
 
 
 	@Test
@@ -137,7 +131,7 @@ public class ReactiveAdapterRegistryTests {
 		Publisher<Integer> source = Flowable.fromIterable(sequence);
 		Object target = getAdapter(rx.Observable.class).fromPublisher(source);
 		assertTrue(target instanceof rx.Observable);
-		assertEquals(sequence, ((rx.Observable) target).toList().toBlocking().first());
+		assertEquals(sequence, ((rx.Observable<?>) target).toList().toBlocking().first());
 	}
 
 	@Test
@@ -162,7 +156,7 @@ public class ReactiveAdapterRegistryTests {
 		Publisher<Integer> source = Flux.fromIterable(sequence);
 		Object target = getAdapter(io.reactivex.Flowable.class).fromPublisher(source);
 		assertTrue(target instanceof io.reactivex.Flowable);
-		assertEquals(sequence, ((io.reactivex.Flowable) target).toList().blockingGet());
+		assertEquals(sequence, ((io.reactivex.Flowable<?>) target).toList().blockingGet());
 	}
 
 	@Test
@@ -171,7 +165,7 @@ public class ReactiveAdapterRegistryTests {
 		Publisher<Integer> source = Flowable.fromIterable(sequence);
 		Object target = getAdapter(io.reactivex.Observable.class).fromPublisher(source);
 		assertTrue(target instanceof io.reactivex.Observable);
-		assertEquals(sequence, ((io.reactivex.Observable) target).toList().blockingGet());
+		assertEquals(sequence, ((io.reactivex.Observable<?>) target).toList().blockingGet());
 	}
 
 	@Test
@@ -251,7 +245,7 @@ public class ReactiveAdapterRegistryTests {
 
 	@Test
 	public void CompletableFutureToPublisher() throws Exception {
-		CompletableFuture<Integer> future = new CompletableFuture();
+		CompletableFuture<Integer> future = new CompletableFuture<>();
 		future.complete(1);
 		Object target = getAdapter(CompletableFuture.class).toPublisher(future);
 		assertTrue("Expected Mono Publisher: " + target.getClass().getName(), target instanceof Mono);

spring-core/src/test/java/org/springframework/util/LinkedCaseInsensitiveMapTests.java

@@ -104,7 +104,6 @@ public class LinkedCaseInsensitiveMapTests {
 	}
 
 	@Test
-	@SuppressWarnings("unchecked")
 	public void mapClone() {
 		map.put("key", "value1");
 		LinkedCaseInsensitiveMap<String> copy = map.clone();