diff --git a/spring-aop/src/test/java/org/springframework/aop/aspectj/AspectJExpressionPointcutTests.java b/spring-aop/src/test/java/org/springframework/aop/aspectj/AspectJExpressionPointcutTests.java
index e5418bf8056d..b851ceb69002 100644
--- a/spring-aop/src/test/java/org/springframework/aop/aspectj/AspectJExpressionPointcutTests.java
+++ b/spring-aop/src/test/java/org/springframework/aop/aspectj/AspectJExpressionPointcutTests.java
@@ -60,7 +60,7 @@ class AspectJExpressionPointcutTests {
 
 
 	@BeforeEach
-	public void setup() throws NoSuchMethodException {
+	void setup() throws NoSuchMethodException {
 		getAge = TestBean.class.getMethod("getAge");
 		setAge = TestBean.class.getMethod("setAge", int.class);
 		setSomeNumber = TestBean.class.getMethod("setSomeNumber", Number.class);
@@ -193,7 +193,7 @@ void testFriendlyErrorOnNoLocation3ArgMatching() {
 
 
 	@Test
-	void testMatchWithArgs() throws Exception {
+	void testMatchWithArgs() {
 		String expression = "execution(void org.springframework.beans.testfixture.beans.TestBean.setSomeNumber(Number)) && args(Double)";
 
 		Pointcut pointcut = getPointcut(expression);
diff --git a/spring-core/src/main/java/org/springframework/util/StringUtils.java b/spring-core/src/main/java/org/springframework/util/StringUtils.java
index 9394b6836c08..52c2ca00bcfb 100644
--- a/spring-core/src/main/java/org/springframework/util/StringUtils.java
+++ b/spring-core/src/main/java/org/springframework/util/StringUtils.java
@@ -123,7 +123,7 @@ public static boolean isEmpty(@Nullable Object str) {
 	 * @see #hasText(CharSequence)
 	 */
 	public static boolean hasLength(@Nullable CharSequence str) {
-		return (str != null && str.length() > 0);
+		return (str != null && !str.isEmpty());  // as of JDK 15
 	}
 
 	/**
@@ -853,7 +853,7 @@ public static Locale parseLocale(String localeValue) {
 		if (!localeValue.contains("_") && !localeValue.contains(" ")) {
 			validateLocalePart(localeValue);
 			Locale resolved = Locale.forLanguageTag(localeValue);
-			if (resolved.getLanguage().length() > 0) {
+			if (!resolved.getLanguage().isEmpty()) {
 				return resolved;
 			}
 		}
@@ -1182,7 +1182,7 @@ public static String[] tokenizeToStringArray(
 			if (trimTokens) {
 				token = token.trim();
 			}
-			if (!ignoreEmptyTokens || token.length() > 0) {
+			if (!ignoreEmptyTokens || !token.isEmpty()) {
 				tokens.add(token);
 			}
 		}
@@ -1244,7 +1244,7 @@ public static String[] delimitedListToStringArray(
 				result.add(deleteAny(str.substring(pos, delPos), charsToDelete));
 				pos = delPos + delimiter.length();
 			}
-			if (str.length() > 0 && pos <= str.length()) {
+			if (!str.isEmpty() && pos <= str.length()) {
 				// Add rest of String, but not in case of empty input.
 				result.add(deleteAny(str.substring(pos), charsToDelete));
 			}