diff --git a/src/main/java/demo/security/servlet/HomeServlet.java b/src/main/java/demo/security/servlet/HomeServlet.java
index fac56e5c..fdbd1f39 100644
--- a/src/main/java/demo/security/servlet/HomeServlet.java
+++ b/src/main/java/demo/security/servlet/HomeServlet.java
@@ -27,6 +27,7 @@ protected void doGet(HttpServletRequest request,
         out.close();
     }
 
+    @Override
     protected void doPost(HttpServletRequest request,
                           HttpServletResponse response) throws ServletException, IOException {
         // TODO Auto-generated method stub
diff --git a/src/main/java/demo/security/servlet/Insecure.java b/src/main/java/demo/security/servlet/Insecure.java
index ebda03fe..f692b5e1 100644
--- a/src/main/java/demo/security/servlet/Insecure.java
+++ b/src/main/java/demo/security/servlet/Insecure.java
@@ -9,6 +9,7 @@
 import java.security.NoSuchAlgorithmException;
 import java.sql.Connection;
 import java.sql.ResultSet;
+import java.sql.SQLException;
 import java.sql.Statement;
 
 import javax.servlet.http.Cookie;
@@ -32,7 +33,7 @@ public void badFunction(HttpServletRequest request) throws IOException {
     Files.exists(Paths.get("/tmp/", obj));
   }
 
-  public String taintedSQL(HttpServletRequest request, Connection connection) throws Exception {
+  public String taintedSQL(HttpServletRequest request, Connection connection) throws SQLException {
     String user = request.getParameter("user");
     String query = "SELECT userid FROM users WHERE username = '" + user  + "'";
     Statement statement = connection.createStatement();
@@ -40,12 +41,12 @@ public String taintedSQL(HttpServletRequest request, Connection connection) thro
     return resultSet.getString(0);
   }
   
-  public String hotspotSQL(Connection connection, String user) throws Exception {
-	  Statement statement = null;
-	  statement = connection.createStatement();
-	  ResultSet rs = statement.executeQuery("select userid from users WHERE username=" + user);
-	  return rs.getString(0);
-	}
+  public String hotspotSQL(Connection connection, String user) throws SQLException {
+    Statement statement = null;
+    statement = connection.createStatement();
+    ResultSet rs = statement.executeQuery("select userid from users WHERE username=" + user);
+    return rs.getString(0);
+  }
 
   // --------------------------------------------------------------------------
   // Custom sources, sanitizer and sinks example
diff --git a/src/main/java/demo/security/util/DBUtils.java b/src/main/java/demo/security/util/DBUtils.java
index 2f1aca62..8870fcaf 100644
--- a/src/main/java/demo/security/util/DBUtils.java
+++ b/src/main/java/demo/security/util/DBUtils.java
@@ -7,8 +7,12 @@
 import java.sql.*;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 public class DBUtils {
+    private static final Logger LOGGER = Logger.getLogger(DBUtils.class.getName());
+
     Object value;
 
     Connection connection;
@@ -79,12 +83,6 @@ public void sumNumbers(int max) {
             count = 0;
             for (int i = 2; i <= number / 2; i++) {
                 if (number % i == 0) {
-                    for (int m = 2; i <= number / 2; i++) {
-                        if (number % m == 0) {
-                            count++;
-                            break;
-                        }
-                    }
                     count++;
                     break;
                 }
@@ -93,7 +91,9 @@ public void sumNumbers(int max) {
                 sum = sum + number;
             }
         }
-        System.out.println("The Sum of numbers is: " + sum);
+        if (LOGGER.isLoggable(Level.INFO)) {
+            LOGGER.info("The Sum of numbers is: " + sum);
+        }
     }
 
     /**