JDBCTest.java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class JDBCTest {

    public static void main(final String[] args) throws Exception {
        final Connection conn = DriverManager.getConnection(args[0],
                                                            args[1],
                                                            args[2]);
        try (final Statement stmt = conn.createStatement()) {
            try (final ResultSet rs = stmt.executeQuery("SELECT 1")) {
                assert rs.first();
                System.out.println(rs.getObject(1));
            }
        }
        
        Thread.sleep(3500);
        
        try (final Statement stmt = conn.createStatement()) {
            try (final ResultSet rs = stmt.executeQuery("SELECT 1")) {
                assert rs.first();
                System.out.println(rs.getObject(1));
            }
        }
    }
}