type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Exception in JSP: /chuli.jsp:17
14: <%
15: String sql1="select * from user1 where username='"+person.getName()+"'";
16: ResultSet rs=db.executeQuery(sql1);
17: if(rs.next())
18: {out.print("对不起，该用户名被别人注册过，请重新注册！三秒后跳到注册页面");
19: response.setHeader("Refresh","3;URL=zhuce.jsp");
20: }else{
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.lang.NullPointerException
org.apache.jsp.chuli_jsp._jspService(chuli_jsp.java:79)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.
public class DataBaseConnection{public static Connection getConnection() {Connection con=null;String CLASSFORNAME="com.mysql.jdbc.Driver";String url="jdbc:mys
