set global max_connections = 200;

public class ParserMain {
        public static void main(String[] args) throws java.io.IOException {
            // Общее число сообщений
            int total_entries = 12000;
            // Кол-во потоков
            int thread_count = 25;
            // Кол-во записей на поток
            int entries_thread = total_entries / thread_count;
            // Начальный инкремент потока
            int thread_end;
            // Конечный инкремент потока
            int thread_start;

            for (int i = 1; i <= thread_count; ++i) {
                thread_end = i * entries_thread;
                thread_start = thread_end - entries_thread;
                new ParserThread(thread_start, thread_end).start();
            }
        }
    }

    public class ParserThread extends Thread {
        private int jstart;
        private int jend;

        protected Connection conn;
        protected PreparedStatement ps;
        protected Statement st;
        protected ResultSet rs;

        public ParserThread(int jstart, int jend) {
            this.jstart = jstart;
            this.jend = jend;
        }

        public void run() {
            String dbDriver = "org.gjt.mm.mysql.Driver";
            String dbHost = "jdbc:mysql://localhost/test?autoReconnect=true";

            try {
                Class.forName(dbDriver);
                conn = DriverManager.getConnection(dbHost, "root", "");
            } catch (Exception e) {
                System.err.println(e.getMessage());
            }
        }
    }