空指针异常,又是空指针异常!!!
我现在做的是一个后台管理员登录的系统,但是提示有空指针异常!!异常信息如下:
root cause
java.lang.NullPointerException
com.tytd.argi.persistence.AdminSql.findByPwd(AdminSql.java:46)
com.tytd.argi.business.Admin.getByPwd(Admin.java:35)
com.tytd.argi.struts.action.AdmLogAction.execute(AdmLogAction.java:34)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.