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java.lang.NullPointerException: 	at de.marcelstuht.nerven2.shared.model.Account.(Account.java:52)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)	at org.hibernate.engine.internal.UnsavedValueFactory.instantiate(UnsavedValueFactory.java:46)	at org.hibernate.engine.internal.UnsavedValueFactory.instantiate(UnsavedValueFactory.java:49)	at org.hibernate.engine.internal.UnsavedValueFactory.getUnsavedIdentifierValue(UnsavedValueFactory.java:68)	at org.hibernate.tuple.PropertyFactory.buildIdentifierProperty(PropertyFactory.java:75)	at org.hibernate.tuple.entity.EntityMetamodel.(EntityMetamodel.java:143)	at org.hibernate.persister.entity.AbstractEntityPersister.(AbstractEntityPersister.java:498)	at org.hibernate.persister.entity.SingleTableEntityPersister.(SingleTableEntityPersister.java:142)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)	at org.hibernate.persister.internal.PersisterFactoryImpl.create(PersisterFactoryImpl.java:158)	at org.hibernate.persister.internal.PersisterFactoryImpl.create(PersisterFactoryImpl.java:180)	at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:131)	at org.hibernate.internal.SessionFactoryImpl.(SessionFactoryImpl.java:345)	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1737)	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1775)	at de.marcelstuht.nerven2.server.HibernateUtil.buildSessionFactory(HibernateUtil.java:18)	at de.marcelstuht.nerven2.server.HibernateUtil.buildSessionFactory(HibernateUtil.java:23)	at de.marcelstuht.nerven2.server.HibernateUtil.(HibernateUtil.java:8)	at de.marcelstuht.nerven2.shared.model.Account.(Account.java:52)	at de.marcelstuht.nerven2.server.GreetingServiceImpl.loginServer(GreetingServiceImpl.java:39)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)