diff --git a/pom.xml b/pom.xml
index 38d8e97db..3c909312b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -372,6 +372,7 @@
                         <source>11</source>
                         <target>11</target>
                     </configuration>
+                    <version>3.0.0-M3</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
diff --git a/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/Hotel.java b/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/Hotel.java
index 58705e5e6..8a756f99c 100644
--- a/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/Hotel.java
+++ b/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/Hotel.java
@@ -44,7 +44,7 @@ public class Hotel {
    */
   public void bookRoom(int roomNumber) throws Exception {
 
-    Optional<Room> room = hotelDao.getById(roomNumber);
+    var room = hotelDao.getById(roomNumber);
 
     if (room.isEmpty()) {
       throw new Exception("Room number: " + roomNumber + " does not exist");
@@ -52,7 +52,7 @@ public class Hotel {
       if (room.get().isBooked()) {
         throw new Exception("Room already booked!");
       } else {
-        Room updateRoomBooking = room.get();
+        var updateRoomBooking = room.get();
         updateRoomBooking.setBooked(true);
         hotelDao.update(updateRoomBooking);
       }
@@ -66,14 +66,14 @@ public class Hotel {
    * @throws Exception if any error
    */
   public void cancelRoomBooking(int roomNumber) throws Exception {
-
-    Optional<Room> room = hotelDao.getById(roomNumber);
+  
+    var room = hotelDao.getById(roomNumber);
 
     if (room.isEmpty()) {
       throw new Exception("Room number: " + roomNumber + " does not exist");
     } else {
       if (room.get().isBooked()) {
-        Room updateRoomBooking = room.get();
+        var updateRoomBooking = room.get();
         updateRoomBooking.setBooked(false);
         int refundAmount = updateRoomBooking.getPrice();
         hotelDao.update(updateRoomBooking);
diff --git a/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/HotelDaoImpl.java b/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/HotelDaoImpl.java
index f1b509416..e95363fb5 100644
--- a/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/HotelDaoImpl.java
+++ b/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/HotelDaoImpl.java
@@ -26,7 +26,6 @@ package com.ashishtrivedi16.transactionscript;
 import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
-import java.sql.SQLException;
 import java.util.Optional;
 import java.util.Spliterator;
 import java.util.Spliterators;
@@ -48,7 +47,7 @@ public class HotelDaoImpl implements HotelDao {
     try {
       var connection = getConnection();
       var statement = connection.prepareStatement("SELECT * FROM ROOMS");
-      ResultSet resultSet = statement.executeQuery(); // NOSONAR
+      var resultSet = statement.executeQuery(); // NOSONAR
       return StreamSupport.stream(new Spliterators.AbstractSpliterator<Room>(Long.MAX_VALUE,
           Spliterator.ORDERED) {
 
@@ -60,7 +59,7 @@ public class HotelDaoImpl implements HotelDao {
             }
             action.accept(createRoom(resultSet));
             return true;
-          } catch (SQLException e) {
+          } catch (Exception e) {
             throw new RuntimeException(e); // NOSONAR
           }
         }
@@ -71,8 +70,8 @@ public class HotelDaoImpl implements HotelDao {
           e.printStackTrace();
         }
       });
-    } catch (SQLException e) {
-      throw new CustomException(e.getMessage(), e);
+    } catch (Exception e) {
+      throw new SqlException(e.getMessage(), e);
     }
   }
 
@@ -90,8 +89,8 @@ public class HotelDaoImpl implements HotelDao {
       } else {
         return Optional.empty();
       }
-    } catch (SQLException ex) {
-      throw new CustomException(ex.getMessage(), ex);
+    } catch (Exception ex) {
+      throw new SqlException(ex.getMessage(), ex);
     } finally {
       if (resultSet != null) {
         resultSet.close();
@@ -113,8 +112,8 @@ public class HotelDaoImpl implements HotelDao {
       statement.setBoolean(4, room.isBooked());
       statement.execute();
       return true;
-    } catch (SQLException ex) {
-      throw new CustomException(ex.getMessage(), ex);
+    } catch (Exception ex) {
+      throw new SqlException(ex.getMessage(), ex);
     }
   }
 
@@ -130,8 +129,8 @@ public class HotelDaoImpl implements HotelDao {
       statement.setBoolean(3, room.isBooked());
       statement.setInt(4, room.getId());
       return statement.executeUpdate() > 0;
-    } catch (SQLException ex) {
-      throw new CustomException(ex.getMessage(), ex);
+    } catch (Exception ex) {
+      throw new SqlException(ex.getMessage(), ex);
     }
   }
 
@@ -141,12 +140,12 @@ public class HotelDaoImpl implements HotelDao {
          var statement = connection.prepareStatement("DELETE FROM ROOMS WHERE ID = ?")) {
       statement.setInt(1, room.getId());
       return statement.executeUpdate() > 0;
-    } catch (SQLException ex) {
-      throw new CustomException(ex.getMessage(), ex);
+    } catch (Exception ex) {
+      throw new SqlException(ex.getMessage(), ex);
     }
   }
 
-  private Connection getConnection() throws SQLException {
+  private Connection getConnection() throws Exception {
     return dataSource.getConnection();
   }
 
@@ -156,12 +155,12 @@ public class HotelDaoImpl implements HotelDao {
       resultSet.close();
       statement.close();
       connection.close();
-    } catch (SQLException e) {
-      throw new CustomException(e.getMessage(), e);
+    } catch (Exception e) {
+      throw new SqlException(e.getMessage(), e);
     }
   }
 
-  private Room createRoom(ResultSet resultSet) throws SQLException {
+  private Room createRoom(ResultSet resultSet) throws Exception {
     return new Room(resultSet.getInt("ID"),
         resultSet.getString("ROOM_TYPE"),
         resultSet.getInt("PRICE"),
diff --git a/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/CustomException.java b/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/SqlException.java
similarity index 88%
rename from transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/CustomException.java
rename to transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/SqlException.java
index 002ea79aa..369eb259d 100644
--- a/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/CustomException.java
+++ b/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/SqlException.java
@@ -26,18 +26,18 @@ package com.ashishtrivedi16.transactionscript;
 /**
  * Custom exception.
  */
-public class CustomException extends Exception {
+public class SqlException extends Exception {
 
   private static final long serialVersionUID = 1L;
 
-  public CustomException() {
+  public SqlException() {
   }
 
-  public CustomException(String message) {
+  public SqlException(String message) {
     super(message);
   }
 
-  public CustomException(String message, Throwable cause) {
+  public SqlException(String message, Throwable cause) {
     super(message, cause);
   }
 }
diff --git a/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/TransactionScriptApp.java b/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/TransactionScriptApp.java
index 13a19dd48..e49e1d501 100644
--- a/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/TransactionScriptApp.java
+++ b/transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/TransactionScriptApp.java
@@ -23,7 +23,6 @@
 
 package com.ashishtrivedi16.transactionscript;
 
-import java.sql.SQLException;
 import java.util.List;
 import javax.sql.DataSource;
 import org.h2.jdbcx.JdbcDataSource;
@@ -51,8 +50,8 @@ public class TransactionScriptApp {
     addRooms(dao);
 
     getRoomStatus(dao);
-
-    Hotel hotel = new Hotel(dao);
+  
+    var hotel = new Hotel(dao);
 
     hotel.bookRoom(1);
     hotel.bookRoom(2);
@@ -77,7 +76,7 @@ public class TransactionScriptApp {
     }
   }
 
-  private static void deleteSchema(DataSource dataSource) throws SQLException {
+  private static void deleteSchema(DataSource dataSource) throws java.sql.SQLException {
     try (var connection = dataSource.getConnection();
          var statement = connection.createStatement()) {
       statement.execute(RoomSchemaSql.DELETE_SCHEMA_SQL);
@@ -89,7 +88,7 @@ public class TransactionScriptApp {
          var statement = connection.createStatement()) {
       statement.execute(RoomSchemaSql.CREATE_SCHEMA_SQL);
     } catch (Exception e) {
-      throw new CustomException(e.getMessage(), e);
+      throw new SqlException(e.getMessage(), e);
     }
   }
 
@@ -99,7 +98,7 @@ public class TransactionScriptApp {
    * @return h2 datasource
    */
   private static DataSource createDataSource() {
-    JdbcDataSource dataSource = new JdbcDataSource();
+    var dataSource = new JdbcDataSource();
     dataSource.setUrl(H2_DB_URL);
     return dataSource;
   }
diff --git a/transaction-script/src/test/java/com/ashishtrivedi16/transactionscript/HotelTest.java b/transaction-script/src/test/java/com/ashishtrivedi16/transactionscript/HotelTest.java
index 62aad9527..86f4605b3 100644
--- a/transaction-script/src/test/java/com/ashishtrivedi16/transactionscript/HotelTest.java
+++ b/transaction-script/src/test/java/com/ashishtrivedi16/transactionscript/HotelTest.java
@@ -28,7 +28,6 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import javax.sql.DataSource;
-import java.sql.SQLException;
 import java.util.List;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -103,7 +102,7 @@ public class HotelTest {
   }
 
 
-  private static void deleteSchema(DataSource dataSource) throws SQLException {
+  private static void deleteSchema(DataSource dataSource) throws java.sql.SQLException {
     try (var connection = dataSource.getConnection();
          var statement = connection.createStatement()) {
       statement.execute(RoomSchemaSql.DELETE_SCHEMA_SQL);
@@ -115,7 +114,7 @@ public class HotelTest {
          var statement = connection.createStatement()) {
       statement.execute(RoomSchemaSql.CREATE_SCHEMA_SQL);
     } catch (Exception e) {
-      throw new CustomException(e.getMessage(), e);
+      throw new SqlException(e.getMessage(), e);
     }
   }