Use instanceof instead of Class#isInstance where feasible

Closes gh-25446

spring-context-indexer/src/main/java/org/springframework/context/index/processor/CandidateComponentsIndexer.java

@@ -137,7 +137,7 @@ public class CandidateComponentsIndexer implements Processor {
 		List<TypeElement> list = new ArrayList<>();
 		for (Element element : elements) {
 			if (TYPE_KINDS.contains(element.getKind()) && element.getModifiers().contains(Modifier.STATIC)) {
-				list.add(TypeElement.class.cast(element));
+				list.add((TypeElement) element);
 			}
 		}
 		return list;

spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/KeyGeneratorAdapter.java

@@ -87,7 +87,7 @@ class KeyGeneratorAdapter implements KeyGenerator {
 	@Override
 	public Object generate(Object target, Method method, Object... params) {
 		JCacheOperation<?> operation = this.cacheOperationSource.getCacheOperation(method, target.getClass());
-		if (!(AbstractJCacheKeyOperation.class.isInstance(operation))) {
+		if (!(operation instanceof AbstractJCacheKeyOperation)) {
 			throw new IllegalStateException("Invalid operation, should be a key-based operation " + operation);
 		}
 		CacheKeyInvocationContext<?> invocationContext = createCacheKeyInvocationContext(target, operation, params);

spring-context/src/test/java/org/springframework/validation/DataBinderTests.java

@@ -1994,7 +1994,7 @@ public class DataBinderTests {
 		mpv.add("age", "invalid");
 		binder.bind(mpv);
 		assertThat(binder.getBindingResult().getFieldError("age").getCode()).isEqualTo("errors.typeMismatch");
-		assertThat(BeanWrapper.class.cast(binder.getInternalBindingResult().getPropertyAccessor()).getAutoGrowCollectionLimit()).isEqualTo(512);
+		assertThat(((BeanWrapper) binder.getInternalBindingResult().getPropertyAccessor()).getAutoGrowCollectionLimit()).isEqualTo(512);
 	}
 
 	@Test // SPR-15009

spring-jms/src/test/java/org/springframework/jms/core/JmsMessagingTemplateTests.java

@@ -652,7 +652,7 @@ public class JmsMessagingTemplateTests {
 						new StubTextMessage((String) invocation.getArguments()[0]));
 		javax.jms.Message message = creator.createMessage(mock);
 		verify(mock).createTextMessage(any());
-		return TextMessage.class.cast(message);
+		return (TextMessage) message;
 	}
 
 }

spring-orm/src/main/java/org/springframework/orm/hibernate5/SessionHolder.java

@@ -51,7 +51,7 @@ public class SessionHolder extends EntityManagerHolder {
 
 	public SessionHolder(Session session) {
 		// Check below is always true against Hibernate >= 5.2 but not against 5.0/5.1 at runtime
-		super(EntityManager.class.isInstance(session) ? session : null);
+		super(session instanceof EntityManager ? session : null);
 		this.session = session;
 	}
 

spring-test/src/main/java/org/springframework/test/web/servlet/result/HandlerResultMatchers.java

@@ -69,7 +69,7 @@ public class HandlerResultMatchers {
 			assertNotNull("No handler", handler);
 			if (handler != null) {
 				Class<?> actual = handler.getClass();
-				if (HandlerMethod.class.isInstance(handler)) {
+				if (handler instanceof HandlerMethod) {
 					actual = ((HandlerMethod) handler).getBeanType();
 				}
 				assertEquals("Handler type", type, ClassUtils.getUserClass(actual));

spring-tx/src/main/java/org/springframework/dao/support/DataAccessUtils.java

@@ -169,7 +169,7 @@ public abstract class DataAccessUtils {
 			if (String.class == requiredType) {
 				result = result.toString();
 			}
-			else if (Number.class.isAssignableFrom(requiredType) && Number.class.isInstance(result)) {
+			else if (Number.class.isAssignableFrom(requiredType) && result instanceof Number) {
 				try {
 					result = NumberUtils.convertNumberToTargetClass(((Number) result), (Class<? extends Number>) requiredType);
 				}

spring-web/src/main/java/org/springframework/http/client/SimpleClientHttpRequestFactory.java

@@ -185,7 +185,7 @@ public class SimpleClientHttpRequestFactory implements ClientHttpRequestFactory,
 	 */
 	protected HttpURLConnection openConnection(URL url, @Nullable Proxy proxy) throws IOException {
 		URLConnection urlConnection = (proxy != null ? url.openConnection(proxy) : url.openConnection());
-		if (!HttpURLConnection.class.isInstance(urlConnection)) {
+		if (!(urlConnection instanceof HttpURLConnection)) {
 			throw new IllegalStateException("HttpURLConnection required for [" + url + "] but got: " + urlConnection);
 		}
 		return (HttpURLConnection) urlConnection;

spring-web/src/main/java/org/springframework/http/server/ServletServerHttpRequest.java

@@ -216,7 +216,7 @@ public class ServletServerHttpRequest implements ServerHttpRequest {
 	@Override
 	public ServerHttpAsyncRequestControl getAsyncRequestControl(ServerHttpResponse response) {
 		if (this.asyncRequestControl == null) {
-			if (!ServletServerHttpResponse.class.isInstance(response)) {
+			if (!(response instanceof ServletServerHttpResponse)) {
 				throw new IllegalArgumentException(
 						"Response must be a ServletServerHttpResponse: " + response.getClass());
 			}

spring-web/src/test/java/org/springframework/http/client/HttpComponentsClientHttpRequestFactoryTests.java

@@ -66,7 +66,7 @@ public class HttpComponentsClientHttpRequestFactoryTests extends AbstractHttpReq
 
 		Object config = request.getHttpContext().getAttribute(HttpClientContext.REQUEST_CONFIG);
 		assertThat(config).as("Request config should be set").isNotNull();
-		assertThat(RequestConfig.class.isInstance(config)).as("Wrong request config type" + config.getClass().getName()).isTrue();
+		assertThat(config instanceof RequestConfig).as("Wrong request config type" + config.getClass().getName()).isTrue();
 		RequestConfig requestConfig = (RequestConfig) config;
 		assertThat(requestConfig.getConnectTimeout()).as("Wrong custom connection timeout").isEqualTo(1234);
 		assertThat(requestConfig.getConnectionRequestTimeout()).as("Wrong custom connection request timeout").isEqualTo(4321);