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图书馆管理系统无法进入系统
发表在JavaWeb图书答疑
2008-05-16
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我的电脑Windows XP系统.我安装了jdk-1_5_0_06-nb-4_1-win-ml.apache-tomcat-5.5.15.NetBean和JBuilder 2006也安装了.数据库安装的mysql-5.0-falcon-alpha-win32.所有软件安装配置正常.按照书中的步骤操作.出现图书馆管理系统登陆界面后输入管理员mr 密码mrsoft 后出现如下错误:
<DIV>HTTP Status 500 - </DIV>
<DIV>--------------------------------------------------------------------------------</DIV>
<DIV>type Exception report</DIV>
<DIV>message </DIV>
<DIV>description The server encountered an internal error () that prevented it from fulfilling this request.</DIV>
<DIV>exception </DIV>
<DIV>java.lang.NullPointerException<BR> com.core.ConnDB.executeQuery(ConnDB.java:32)<BR> com.dao.ManagerDAO.checkManager(ManagerDAO.java:70)<BR> com.action.Manager.managerLogin(Manager.java:53)<BR> com.action.Manager.perform(Manager.java:24)<BR> org.apache.struts.action.ActionServlet.processActionPerform(ActionServlet.java:1787)<BR> org.apache.struts.action.ActionServlet.process(ActionServlet.java:1586)<BR> org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)<BR> javax.servlet.http.HttpServlet.service(HttpServlet.java:709)<BR> javax.servlet.http.HttpServlet.service(HttpServlet.java:802)</DIV>
<DIV><BR>note The full stack trace of the root cause is available in the Apache Tomcat/5.5.15 logs.</DIV>
<DIV><BR>--------------------------------------------------------------------------------</DIV>
<DIV>Apache Tomcat/5.5.15 </DIV>
<DIV>请高手帮忙解决一下</DIV>
<DIV>HTTP Status 500 - </DIV>
<DIV>--------------------------------------------------------------------------------</DIV>
<DIV>type Exception report</DIV>
<DIV>message </DIV>
<DIV>description The server encountered an internal error () that prevented it from fulfilling this request.</DIV>
<DIV>exception </DIV>
<DIV>java.lang.NullPointerException<BR> com.core.ConnDB.executeQuery(ConnDB.java:32)<BR> com.dao.ManagerDAO.checkManager(ManagerDAO.java:70)<BR> com.action.Manager.managerLogin(Manager.java:53)<BR> com.action.Manager.perform(Manager.java:24)<BR> org.apache.struts.action.ActionServlet.processActionPerform(ActionServlet.java:1787)<BR> org.apache.struts.action.ActionServlet.process(ActionServlet.java:1586)<BR> org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)<BR> javax.servlet.http.HttpServlet.service(HttpServlet.java:709)<BR> javax.servlet.http.HttpServlet.service(HttpServlet.java:802)</DIV>
<DIV><BR>note The full stack trace of the root cause is available in the Apache Tomcat/5.5.15 logs.</DIV>
<DIV><BR>--------------------------------------------------------------------------------</DIV>
<DIV>Apache Tomcat/5.5.15 </DIV>
<DIV>请高手帮忙解决一下</DIV>
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