[Si e' verificato un errore di sistema!, Eccezione: java.lang.NullPointerException: null is not a valid identifier , Stack Trace: , net.sf.hibernate.impl.SessionImpl.load(SessionImpl.java:1929) , it.castellidelducato.persistence.impl.hibernate2.HibernateService.read(HibernateService.java:169), it.castellidelducato.action.CastleAction.prepare(CastleAction.java:24), com.opensymphony.xwork.interceptor.PrepareInterceptor.before(PrepareInterceptor.java:28), com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:34), com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:164), it.castellidelducato.persistence.PersistenceInterceptor.intercept(PersistenceInterceptor.java:51), com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:164), com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35), com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:164), ...]