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java.lang.NullPointerException: 	at java.util.Calendar.setTime(Calendar.java:902)	at java.text.SimpleDateFormat.format(SimpleDateFormat.java:782)	at java.text.SimpleDateFormat.format(SimpleDateFormat.java:775)	at java.text.DateFormat.format(DateFormat.java:314)	at schulnoten.Schueler.getGeburtstag(Schueler.java:153)