Why derby do not auto commit?

[Hawkx]

I found that derby do not auto commit data change on my computer, even I set
auto commit to true explicitly. nothing written to database, unless I call
commit().

java version "1.6.0_19"
Java(TM) SE Runtime Environment (build 1.6.0_19-b04)
Java HotSpot(TM) Client VM (build 16.2-b04, mixed mode, sharing)
derby 10.6.1 embedded driver

Code:
    Connection con =
DriverManager.getConnection("jdbc:derby:D:/test/testdb");
//    con.setAutoCommit(true);
    Statement stm = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);
    ResultSet rst = stm.executeQuery("SELECT * FROM test_table");
    rst.moveToInsertRow();
    rst.updateString(1, "test line");
    rst.insertRow();
    rst.beforeFirst();
    while (rst.next()) {
      System.out.println(rst.getString(1));
    }
    System.out.println(con.getAutoCommit());
//    con.commit();
    con.close();

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