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java.lang.UnsupportedOperationException: The user must supply a JDBC connection	at org.hibernate.connection.UserSuppliedConnectionProvider.getConnection(UserSuppliedConnectionProvider.java:54)	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)	at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)	at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:160)	at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:81)	at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)	at com.vaannila.student.Main.main(Main.java:15)