我是否必须在Webstart应用程序中显式调用System.exit（）？

Recently I converted a Swing application to Webstart. The process was pretty straightforward, but I found that after I close all windows, my application's JVM did not terminate. The thread dump showed that there are a couple of non-daemon threads, notably Swing's EDT, AWT and a couple of websart related threads. Recently I converted a Swing application to Web