diff --git a/core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/deepcopyarraylist/Course.java b/core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/deepcopyarraylist/Course.java
index 5724be7218..f8367cfd50 100644
--- a/core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/deepcopyarraylist/Course.java
+++ b/core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/deepcopyarraylist/Course.java
@@ -36,7 +36,7 @@ public class Course implements Serializable, Cloneable {
         try {
             return (Course) super.clone();
         } catch (CloneNotSupportedException e) {
-            throw new AssertionError();
+            throw new IllegalStateException(e);
         }
     }
 }
diff --git a/core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/deepcopyarraylist/Student.java b/core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/deepcopyarraylist/Student.java
index fedc9010ab..0b3f1ba4a9 100644
--- a/core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/deepcopyarraylist/Student.java
+++ b/core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/deepcopyarraylist/Student.java
@@ -95,7 +95,7 @@ public class Student implements Serializable, Cloneable {
         try {
             student = (Student) super.clone();
         } catch (CloneNotSupportedException e) {
-            throw new AssertionError();
+            throw new IllegalStateException(e);
         }
         student.course = this.course.clone();
         return student;