请问:如下的错误是怎麽回事?如何解决
Apache Tomcat/4.0.6 - HTTP Status 500 - Internal Server Error
type :Exception report
message :Internal Server Error
description :The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this
request:java.lang.NullPointerException
at com.linktone.wap.core.dao.hibernate.HibernateSessionFactory.openSession(HibernateSessionFactory.java:27)