HikariCP generate too many connection in every request in Java - database-connection

Question

I am using HikariCP-3.1.0.jar for managing the connection pool. But When I request to my Database, it generates new more connection in every request. Every request generates a double connection or more in my database session.
Here is the configuration of my HikariCP connection to oracle database...
import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
public class JDBConnection {
public static Connection getConnection() {
Connection con = null;
try {
HikariConfig config = new HikariConfig();
config.setJdbcUrl("jdbc:oracle:thin:#localhsot:1521/mydb");
config.setUsername("dbuser");
config.setPassword("dppass");
config.setMaximumPoolSize(2000);
config.setAutoCommit(false);
config.setMinimumIdle(10);
config.setConnectionTimeout(30000);//second
config.setIdleTimeout(2 * 60 * 1000);//2 minutes
config.addDataSourceProperty("cachePrepStmts", "true");
config.addDataSourceProperty("prepStmtCacheSize", "250");
config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
config.setDriverClassName("oracle.jdbc.OracleDriver");
HikariDataSource dataSource = new HikariDataSource(config);
con = dataSource.getConnection();
} catch (SQLException ex) {
Logger.getLogger(JDBConnection.class.getName()).log(Level.SEVERE, null, ex);
}
return con;
}
public static void releaseConnection(Connection con) {
try {
con.close();
} catch (SQLException ex) {
Logger.getLogger(DBConnectionHandler.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
Calling like below:
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Calling {
public void getMessages() {
String sql = "mysql";
Connection con = JDBConnection.getConnection();
try {
PreparedStatement ps = con.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
if (rs.next()) {
String title = rs.getString("title");
}
} catch (SQLException ex) {
Logger.getLogger(Calling.class.getName()).log(Level.SEVERE, null, ex);
} finally {
JDBConnection.releaseConnection(con);
}
}
}
Is there any wrong with the configuration in HikariCP? Please help me