unable to drop table in HSQLDB

I am unable to drop table with default user SA(or any user for that matter) in HSQLDB even though I can create table and read them without problem, please see my code below, what's wrong? On the other hand, If I use a third party SQL client(eg. squirrel), I can login and drop table without problem even when user is empty.

 public static void main(String[]args){
        try {

            DBManager.executeUpdate("drop table mytable");

        } catch (SQLException ex) {
           ex.printStackTrace();
        }
    }
    public static Connection getConnection(){
        Connection c =null;

         try {
            c = DriverManager.getConnection("jdbc:hsqldb:file:e:xxx_dbxxx", "SA", "");


        } catch (SQLException ex) {
            ex.printStackTrace();
        }
        return c;
    }
    public static int executeUpdate(String s) throws SQLException {
        Connection con = getConnection();
        try{
            return con.createStatement().executeUpdate(s);
        }
        finally{
            if(con!=null)try {
                con.close();
            } catch (SQLException ex) {
                Logger.getLogger(DBManager.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
    }

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尝试执行DDL后提交。

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事实证明，我需要做一个明确的关机

 DBManager.executeUpdate("shutdown");

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