diff --git a/core-java-modules/core-java-15/pom.xml b/core-java-modules/core-java-15/pom.xml
index c6f1454078..df8aeafca9 100644
--- a/core-java-modules/core-java-15/pom.xml
+++ b/core-java-modules/core-java-15/pom.xml
@@ -51,8 +51,8 @@
                 <configuration>
                     <release>${maven.compiler.release}</release>
                     <compilerArgs>--enable-preview</compilerArgs>
-                    <source>15</source>
-                    <target>15</target>
+                    <source>14</source>
+                    <target>14</target>
                 </configuration>
             </plugin>
             <plugin>
diff --git a/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/records/Person.java b/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/records/Person.java
index 67d3151440..74cf5edf9c 100644
--- a/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/records/Person.java
+++ b/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/records/Person.java
@@ -3,15 +3,12 @@ package com.baeldung.whatsnew.records;
 /**
  * Java record with a header indicating 2 fields.
  */
-public record Person(String name, int age)
-{
+public record Person(String name, int age) {
     /**
      * Public constructor that does some basic validation.
      */
-    public Person
-    {
-        if (age < 0)
-        {
+    public Person {
+        if (age < 0) {
             throw new IllegalArgumentException("Age cannot be negative");
         }
     }
diff --git a/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Employee.java b/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Employee.java
index 72ef75cb7c..ec85c371b7 100644
--- a/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Employee.java
+++ b/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Employee.java
@@ -2,10 +2,8 @@ package com.baeldung.whatsnew.sealedclasses;
 
 import java.util.Date;
 
-public non-sealed class Employee extends Person
-{
-    public Date getHiredDate()
-    {
+public non-sealed class Employee extends Person {
+    public Date getHiredDate() {
         return new Date();
     }
 }
diff --git a/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Manager.java b/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Manager.java
index 87cbcf2673..79c50b057e 100644
--- a/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Manager.java
+++ b/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Manager.java
@@ -1,5 +1,4 @@
 package com.baeldung.whatsnew.sealedclasses;
 
-public final class Manager extends Person
-{
+public final class Manager extends Person {
 }
diff --git a/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Person.java b/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Person.java
index d4beb64867..2a52bc1a73 100644
--- a/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Person.java
+++ b/core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Person.java
@@ -2,23 +2,19 @@ package com.baeldung.whatsnew.sealedclasses;
 
 import java.util.Date;
 
-public sealed class Person permits Employee, Manager
-{
+public sealed class Person permits Employee, Manager {
     /**
      * Demonstration of pattern matching for instanceof
      *
      * @param person A Person object
      * @return
      */
-    public static void patternMatchingDemo(Person person)
-    {
-        if(person instanceof Employee employee)
-        {
+    public static void patternMatchingDemo(Person person) {
+        if(person instanceof Employee employee) {
             Date hiredDate = employee.getHiredDate();
         }
 
-        if(person instanceof Employee employee && employee.getHiredDate() != null)
-        {
+        if(person instanceof Employee employee && employee.getHiredDate() != null) {
             Date hiredDate = employee.getHiredDate();
         }
     }