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The user must supply a JDBC connection
java.lang.UnsupportedOperationException: The user must supply a JDBC connection	at net.sf.hibernate.connection.UserSuppliedConnectionProvider.getConnection(UserSuppliedConnectionProvider.java:32)	at net.sf.hibernate.impl.BatcherImpl.openConnection(BatcherImpl.java:278)	at net.sf.hibernate.id.TableGenerator.generate(TableGenerator.java:81)	at net.sf.hibernate.id.TableHiLoGenerator.generate(TableHiLoGenerator.java:59)	at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:765)	at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:738)	at com.k_buy.accor.servlet.CrearUsuarioPrueba.processRequest(CrearUsuarioPrueba.java:87)	at com.k_buy.accor.servlet.CrearUsuarioPrueba.main(CrearUsuarioPrueba.java:32)