pom.xml

@@ -47,9 +47,8 @@
 			<version>8.0.33</version>
 		</dependency>
 		<dependency>
-			<groupId>org.springframework</groupId>
-			<artifactId>spring-jdbc</artifactId>
-			<version>5.3.14</version>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-jdbc</artifactId>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework</groupId>

src/main/java/entgra/mailsender/Config/DataSourceConfig.java

@@ -0,0 +1,35 @@
+package entgra.mailsender.Config;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+
+import javax.sql.DataSource;
+
+@Configuration
+public class DataSourceConfig {
+    @Value("${spring.datasource.url}")
+    private String dbUrl;
+
+    @Value("${spring.datasource.username}")
+    private String dbUserName;
+
+    @Value("${spring.datasource.password}")
+    private String dbPassword;
+
+    @Value("${spring.datasource.driver-class-name}")
+    private String dbDriver;
+
+    @Primary
+    @Bean
+    public DataSource dataSource(){
+        return DataSourceBuilder.create()
+                .url(dbUrl)
+                .username(dbUserName)
+                .password(dbPassword)
+                .driverClassName(dbDriver)
+                .build();
+    }
+}

src/main/java/entgra/mailsender/DAO/Impl/MailDAOImpl.java

@@ -9,6 +9,7 @@ import entgra.mailsender.exception.FileConversionException;
 import entgra.mailsender.exception.MailProcessingException;
 import org.springframework.stereotype.Component;
 
+import javax.sql.DataSource;
 import java.io.*;
 import java.sql.Connection;
 import java.sql.DriverManager;
@@ -28,16 +29,22 @@ public class MailDAOImpl implements MailDAO {
 
     Logger logger = Logger.getLogger(String.valueOf(MailDAOImpl.class));
 
-    private Connection getConnection() throws SQLException {
-        return DriverManager.getConnection("jdbc:mysql://localhost:3306/email_sending", "root", "StrongPassword123!");
+    private DataSource dataSource;
+
+    public MailDAOImpl(DataSource dataSource){
+        this.dataSource = dataSource;
     }
 
+//    private Connection getConnection() throws SQLException {
+//        return DriverManager.getConnection("jdbc:mysql://localhost:3306/email_sending", "root", "StrongPassword123!");
+//    }
+
     @Override
     public int addMail(MailModel mailModel) throws SQLException {
         try {
             PreparedStatement stmt;
             int generatedId;
-            Connection conn = this.getConnection();
+            Connection conn = dataSource.getConnection();
             stmt = conn.prepareStatement("INSERT INTO EMAIL (EMAIL_ADDRESS, MSG_TEMPLATE, PRIORITY, ATTACHMENT, PARAMETERS, TIME, FILENAME, EXPIRY_AT) VALUES (?, ?, ?, ?, ?, ?, ?, ?)", PreparedStatement.RETURN_GENERATED_KEYS);
             Timestamp current_time = new Timestamp(System.currentTimeMillis());
             String parametersJson = new ObjectMapper().writeValueAsString(mailModel.getParameters());
@@ -74,7 +81,7 @@ public class MailDAOImpl implements MailDAO {
 
         List<MailModel> unsentMails = new ArrayList<>();
 
-        try (Connection connection = this.getConnection();
+        try (Connection connection = dataSource.getConnection();
              PreparedStatement statement = connection.prepareStatement(sql);
              ResultSet rs = statement.executeQuery()) {
             while (rs.next()) {
@@ -98,7 +105,7 @@ public class MailDAOImpl implements MailDAO {
         MailModel mailModel = new MailModel();
 
         try {
-            Connection conn = this.getConnection();
+            Connection conn = dataSource.getConnection();
             try (PreparedStatement stmt = conn.prepareStatement(sql)) {
                 stmt.setInt(1, mail_id);
                 try (ResultSet rs = stmt.executeQuery()) {
@@ -160,7 +167,7 @@ public class MailDAOImpl implements MailDAO {
     public void addToSentMail(Integer mail_id) {
         try {
             PreparedStatement stmt;
-            Connection connection = this.getConnection();
+            Connection connection = dataSource.getConnection();
             stmt = connection.prepareStatement("INSERT INTO SENTEMAIL (EMAIL_ID,SENT_TIME) VALUE (?,?)");
             stmt.setInt(1, mail_id);
             stmt.setDate(2, Date.valueOf(LocalDate.now()));