为什么SimpleDateFormatter会返回错误

Question

调用此方法，并且应该将时间输出到void msgOut（String s）

        SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");
        String uhrzeit = sdf.format(new Date());

        msgOut("[System] Zeit: "+uhrzeit);

        txtSName.setText("");
        txtSName.requestFocus();
    }

但每次都会返回错误：

Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
    at sun.util.calendar.ZoneInfo.getOffsets(ZoneInfo.java:236)
    at java.util.GregorianCalendar.computeFields(GregorianCalendar.java:2340)
    at java.util.GregorianCalendar.computeFields(GregorianCalendar.java:2312)
    at java.util.Calendar.setTimeInMillis(Calendar.java:1804)
    at java.util.Calendar$Builder.build(Calendar.java:1508)
    at sun.util.locale.provider.CalendarProviderImpl.getInstance(CalendarProviderImpl.java:88)
    at java.util.Calendar.createCalendar(Calendar.java:1666)
    at java.util.Calendar.getInstance(Calendar.java:1655)
    at java.text.SimpleDateFormat.initializeCalendar(SimpleDateFormat.java:657)
    at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:601)
    at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:580)
    at Server.befTime(Server.java:261)

（行SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");是行号261并返回错误...

有人可以帮帮我吗？

添加：相同 - ＆gt; SAME（复制和粘贴）方法在另一个类中工作，没有任何错误...