Revert introduction of isNotEmpty aliases

Issue: SPR-12009

spring-core/src/main/java/org/springframework/util/StringUtils.java

@@ -79,43 +79,11 @@ public abstract class StringUtils {
 	 * Objects since attributes may e.g. be primitive value objects as well.
 	 * @param str the candidate String
 	 * @since 3.2.1
-	 * @see #isNotEmpty(CharSequence)
-	 * @see #isNotEmpty(String)
 	 */
 	public static boolean isEmpty(Object str) {
 		return (str == null || "".equals(str));
 	}
 
-	/**
-	 * Check that the given {@code CharSequence} is not empty (i.e., neither
-	 * {@code null} nor of length 0).
-	 * <p>This method is an alias for {@link #hasLength(CharSequence)}.
-	 * <p>Note: this method returns {@code true} for a {@code CharSequence}
-	 * that purely consists of whitespace.
-	 * @param str the {@code CharSequence} to check (may be {@code null})
-	 * @return {@code true} if the {@code CharSequence} is not {@code null} and has length
-	 * @see #hasText(CharSequence)
-	 * @since 4.2
-	 */
-	public static boolean isNotEmpty(CharSequence str) {
-		return hasLength(str);
-	}
-
-	/**
-	 * Check that the given {@code String} is not empty (i.e., neither
-	 * {@code null} nor of length 0).
-	 * <p>This method is an alias for {@link #hasLength(String)}.
-	 * <p>Note: this method returns {@code true} for a {@code String} that
-	 * purely consists of whitespace.
-	 * @param str the {@code String} to check (may be {@code null})
-	 * @return {@code true} if the {@code String} is not {@code null} and has length
-	 * @see #hasText(String)
-	 * @since 4.2
-	 */
-	public static boolean isNotEmpty(String str) {
-		return hasLength(str);
-	}
-
 	/**
 	 * Check that the given {@code CharSequence} is neither {@code null} nor
 	 * of length 0.