import java.sql.Connection;
import java.sql.DriverManager;

public class LockTest {

    public static void main(String[] args) throws Exception {
        System.out.println("using: "+org.postgresql.Driver.getVersion());
        Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/locktest", "test", "blubb");
        conn.setAutoCommit(false);
        conn.setTransactionIsolation(Connection.TRANSACTION_SERIALIZABLE);
        conn.setReadOnly(false);
        conn.createStatement().execute("SET statement_timeout TO 5000; LOCK TABLE exampletable IN EXCLUSIVE MODE; SET statement_timeout TO DEFAULT;");
        System.out.println("Lock acquired");
        Thread.sleep(10000000);
    }
}