lingering excel process

Hi,

Consider the following piece of code:

public class testexcel
{
    public static void main(String[] args) throws COMException
    {
        try
        {
            Ole32.CoInitialize();
            DispatchPtr app = new DispatchPtr("Excel.Application");
            app.put("Visible", false);
            DispatchPtr wbooks = (DispatchPtr) app.get("Workbooks");
            DispatchPtr wbook = (DispatchPtr) wbooks.invoke("Open",
"c:\\t.xls");
            wbook.invoke("Close");
            wbooks.invoke("Close");
            app.invoke("Quit");
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        finally
        {
            Ole32.CoUninitialize();
        }
    }

}


When i run the above, excel process still keeps on running even though
the above program is finished. What do we need to do to get rid of
this process.

Thanks