Apache DBCP2 with SSL client authentication

TestDBCP.java

import java.sql.ResultSet;
import org.apache.commons.dbcp2.BasicDataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class TestDBCP {

    private BasicDataSource connectionPool;

    public void init() {
        String dbUrl = "jdbc:postgresql://server_ip:5432/postgres";
        connectionPool = new BasicDataSource();

        connectionPool.setDriverClassName("org.postgresql.Driver");
        connectionPool.setUrl(dbUrl);
        connectionPool.setUsername("postgres");
        connectionPool.setPassword("postgres");
        connectionPool.setInitialSize(1);        
        connectionPool.addConnectionProperty("ssl", "true");
        connectionPool.addConnectionProperty("sslmode", "verify-ca");
        connectionPool.addConnectionProperty("sslcert", "postgres-client.crt");
        connectionPool.addConnectionProperty("sslkey", "postgres-client.key.pk8");
        connectionPool.addConnectionProperty("sslrootcert", "ca.crt");

        try ( Connection conn = connectionPool.getConnection()) {
            // Do your thing with conn object
        } catch (SQLException e) {
            System.err.println(e.getMessage());
        }
    }

    public static void main(String[] args) {
        new TestDBCP().init();
    }
}