我将光盘中的06考到tomcat目录下，将数据文件成功还原的sqlserver中，在web-inf的lib目录中拷贝了antlr.jar，commons-beanutils.jar，commons-collections.jar，commons-digester.jar，commons-fileupload.jar，commons-logging.jar，commons-validator.jar，hibernate3.jar，jakarta-oro.jar，jta.jar，jtds-0.8.1.jar，struts.jar，这些文件。但是在输入用户名和密码后，出现如下错误：
exception 

javax.servlet.ServletException
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:516)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:423)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.struts.filter.MyFilter.doFilter(MyFilter.java:15)


root cause 

java.lang.NullPointerException
com.hiernate.util.HibernateUtil.findUser(HibernateUtil.java:27)
com.struts.action.FindUserAction.finUser(FindUserAction.java:23)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:276)
org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:196)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.struts.filter.MyFilter.doFilter(MyFilter.java:15)

请问是什么环节出现错误了，如果是lib中的文件有问题，你能将这些文件给我吗？