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java.lang.NullPointerException: 	at net.sf.hibernate.collection.Set.toString(Set.java:218)	at java.lang.String.valueOf(String.java:2177)	at java.io.PrintStream.print(PrintStream.java:462)	at java.io.PrintStream.println(PrintStream.java:599)	at de.jdufner.Main.main(Main.java:46)