Java code to check if you have the PostgreSQL jdbc driver configured properly and if you can access your database. Replace the string values for the database property where necessary.

TestDBConnection.java

package tests;

import database.properties.DBProperty;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * @author : saif
 * @project : UniDB
 * @date : 23/10/15
 */
public class TestDBConnection {

    private static final Logger log = Logger.getLogger(DBProperty.class.getName());

    public static void main(String[] args) {

        DBProperty dbProperty = new DBProperty();

        String serverURL = dbProperty.getServerURL();
        String dbName = dbProperty.getDbName();
        String url = serverURL+dbName;
        String username = dbProperty.getUsername();
        String password = dbProperty.getPassword();

        try {
            Class.forName("org.postgresql.Driver");
        } catch (ClassNotFoundException e) {
            log.log(Level.SEVERE, e.toString(), e);
            e.printStackTrace();
        }

        log.log(Level.INFO, "PostgreSQL driver registered.");

        Connection dbConn = null;

        try {
            dbConn = DriverManager.getConnection(url, username, password);

            if (dbConn != null) {
                log.log(Level.INFO, "Database accessed!");
            } else {
                log.log(Level.SEVERE, "Failed to make dbConnection");
            }
        } catch (SQLException e) {
            log.log(Level.SEVERE, e.toString(), e);
            e.printStackTrace();
        } finally {
            try {
                if (dbConn != null)
                    dbConn.close();
            } catch (SQLException e) {
                log.log(Level.SEVERE, e.toString(), e);
                e.printStackTrace();
            }
        }


    }
}