這篇文章保存下自己要解決的異常
java.lang.NullPointerException org.apache.jsp.index_jsp._jspInit(index_jsp.java:27) org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52) org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
2,開發環境Eclipse3.7 動態web工程
javax.servlet.ServletException: Servlet execution threw an exception
root cause
java.lang.NoClassDefFoundError: org/hibernate/Session
cn.itworks.J2EE.dao.impl.daoImpl.getPersonit(daoImpl.java:18)
cn.itworks.J2EE.service.ShowPersonsServlet.doGet(ShowPersonsServlet.java:40)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
java.lang.ClassNotFoundException: org.hibernate.Session
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
java.lang.ClassLoader.loadClassInternal(Unknown Source)
cn.itworks.J2EE.dao.impl.daoImpl.getPersonit(daoImpl.java:18)
cn.itworks.J2EE.service.ShowPersonsServlet.doGet(ShowPersonsServlet.java:40)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)