Question

类型：例外报告

消息：An exception occurred processing JSP page /registration.jsp

说明：The server encountered an internal error that prevented it from fulfilling this request。

异常：

org.apache.jasper.JasperException：在第14行处理JSP页面/registration.jsp时发生异常

 Statement st = con.createStatement();
 ResultSet rs;
 int i = st.executeUpdate("insert into members(fname,lname,email,uname,pass) values (?,?,?,?,?)");
if (i > 0) {
     session.setAttribute("userid", user);
     response.sendRedirect("welcome.jsp");

堆栈跟踪：

org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:575)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:462)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

根本原因：

javax.servlet.ServletException: java.sql.SQLSyntaxErrorException: Invalid amount of bind variables
'insert into members(fname,lname,email,uname,pass) values (?,?,?,?,?)'
    org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:916)
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:845)
    org.apache.jsp.registration_jsp._jspService(registration_jsp.java:116)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

根本原因

java.sql.SQLSyntaxErrorException: Invalid amount of bind variables
'insert into members(fname,lname,email,uname,pass) values (?,?,?,?,?)'
    org.bigsql.cassandra2.jdbc.CassandraStatement.doExecute(CassandraStatement.java:188)
    org.bigsql.cassandra2.jdbc.CassandraStatement.executeUpdate(CassandraStatement.java:252)
    org.apache.jsp.registration_jsp._jspService(registration_jsp.java:96)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

根本原因

InvalidRequestException(why:Invalid amount of bind variables)
    org.apache.cassandra.thrift.Cassandra$execute_cql3_query_result$execute_cql3_query_resultStandardScheme.read(Cassandra.java:50297)
    org.apache.cassandra.thrift.Cassandra$execute_cql3_query_result$execute_cql3_query_resultStandardScheme.read(Cassandra.java:50274)
    org.apache.cassandra.thrift.Cassandra$execute_cql3_query_result.read(Cassandra.java:50189)
    org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:78)
    org.apache.cassandra.thrift.Cassandra$Client.recv_execute_cql3_query(Cassandra.java:1734)
    org.apache.cassandra.thrift.Cassandra$Client.execute_cql3_query(Cassandra.java:1719)
    org.bigsql.cassandra2.jdbc.CassandraConnection.execute(CassandraConnection.java:548)
    org.bigsql.cassandra2.jdbc.CassandraConnection.execute(CassandraConnection.java:574)
    org.bigsql.cassandra2.jdbc.CassandraStatement.doExecute(CassandraStatement.java:171)
    org.bigsql.cassandra2.jdbc.CassandraStatement.executeUpdate(CassandraStatement.java:252)
    org.apache.jsp.registration_jsp._jspService(registration_jsp.java:96)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

Answer 1

Statement st = con.createStatement（）;

您应该使用PreparedStatement代替Statement。例如：

PreparedStatement ps = conn.prepareStatement("insert into members(fname,lname,email,uname,pass) values (?,?,?,?,?)");
ps.setString(1,fname);
ps.setString(2,lname);
  ...

处理JSP页面/registration.jsp时发生异常

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