From 63759d76b9a68b9d35ce55ce07a415a4b4ef266f Mon Sep 17 00:00:00 2001
From: Zahid Khan <63726443+ZFK07@users.noreply.github.com>
Date: Fri, 1 Jul 2022 01:24:22 +0530
Subject: [PATCH] Add assertions on utility classes in IP module

* Add assertions and comment on the utility class.
Added assertion on the utility class, so that it can't be mistakenly ever initialized in the class.
* Add exception message for RegexUtils
* Add exception message "Class Instantiation not allowed." for the TestingUtilities
---
 .../org/springframework/integration/ip/util/RegexUtils.java     | 2 ++
 .../springframework/integration/ip/util/TestingUtilities.java   | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/spring-integration-ip/src/main/java/org/springframework/integration/ip/util/RegexUtils.java b/spring-integration-ip/src/main/java/org/springframework/integration/ip/util/RegexUtils.java
index a982b48fb0..0473c9324b 100644
--- a/spring-integration-ip/src/main/java/org/springframework/integration/ip/util/RegexUtils.java
+++ b/spring-integration-ip/src/main/java/org/springframework/integration/ip/util/RegexUtils.java
@@ -43,7 +43,9 @@ public final class RegexUtils {
 		return stringToEscape.replaceAll("([.$\\[\\]^*+{}()\\\\?|])", "\\\\$1");
 	}
 
+	// Non-instantiable utility class
 	private RegexUtils() {
+		throw new AssertionError("Class Instantiation not allowed.");
 	}
 
 }
diff --git a/spring-integration-ip/src/main/java/org/springframework/integration/ip/util/TestingUtilities.java b/spring-integration-ip/src/main/java/org/springframework/integration/ip/util/TestingUtilities.java
index 245da64eef..2327396221 100644
--- a/spring-integration-ip/src/main/java/org/springframework/integration/ip/util/TestingUtilities.java
+++ b/spring-integration-ip/src/main/java/org/springframework/integration/ip/util/TestingUtilities.java
@@ -33,7 +33,9 @@ import org.springframework.lang.Nullable;
  */
 public final class TestingUtilities {
 
+	// Non-instantiable utility class
 	private TestingUtilities() {
+		throw new AssertionError("Class Instantiation not allowed.");
 	}
 
 	/**