Use String.isEmpty instead of length

Author: ngocnhan-tran1996

spring-integration-file/src/main/java/org/springframework/integration/file/remote/RemoteFileUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -29,6 +29,7 @@
  *
  * @author Gary Russell
  * @author Artem Bilan
+ * @author Ngoc Nhan
  *
  * @since 3.0
  *
@@ -56,7 +57,7 @@ public static <F> void makeDirectories(String path, Session<F> session, String r
 				List<String> pathsToCreate = new LinkedList<>();
 				while (nextSeparatorIndex > -1) {
 					String pathSegment = path.substring(0, nextSeparatorIndex);
-					if (pathSegment.length() == 0 || session.exists(pathSegment)) {
+					if (pathSegment.isEmpty() || session.exists(pathSegment)) {
 						// no more paths to create
 						break;
 					}

spring-integration-jpa/src/main/java/org/springframework/integration/jpa/config/xml/RetrievingJpaOutboundGatewayParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -37,6 +37,7 @@
  * @author Amol Nayak
  * @author Gunnar Hillert
  * @author Artem Bilan
+ * @author Ngoc Nhan
  *
  * @since 2.2
  */
@@ -99,9 +100,9 @@ private static void parseIdExpression(Element gatewayElement, ParserContext pars
 
 			boolean childElementsExist = !CollectionUtils.isEmpty(DomUtils.getChildElementsByTagName(gatewayElement,
 					"parameter"));
-			if (others.length() > 0 || childElementsExist) {
+			if (!others.isEmpty() || childElementsExist) {
 				parserContext.getReaderContext().error(
-						(others.length() == 0 ? "" : "'" + others + "' "
+						(others.isEmpty() ? "" : "'" + others + "' "
 								+ (childElementsExist ? "and " : ""))
 								+ (childElementsExist ? "child elements " : "")
 								+ "not allowed with an 'id-expression' attribute.",

spring-integration-xml/src/main/java/org/springframework/integration/xml/transformer/support/XPathExpressionEvaluatingHeaderValueMessageProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2022 the original author or authors.
+ * Copyright 2014-2024 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.
@@ -40,6 +40,7 @@
  * @author Jonas Partner
  * @author Mark Fisher
  * @author Artem Bilan
+ * @author Ngoc Nhan
  *
  * @since 2.0
  */
@@ -122,7 +123,7 @@ public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
 	public Object processMessage(Message<?> message) {
 		Node node = this.converter.convertToNode(message.getPayload());
 		Object result = this.evaluationType.evaluateXPath(this.expression, node);
-		if (result instanceof String && ((String) result).length() == 0) {
+		if (result instanceof String string && string.isEmpty()) {
 			result = null;
 		}
 		if (result != null && this.headerTypeDescriptor != null) {