<%@page import="Koneksi.koneksi" %>
<%@page import="java.sql.*" %>
<% String nim = request.getParameter("txtNim");
String nama = request.getParameter("txtNama");
String alamat = request.getParameter("txtAlamat");
String oke = request.getParameter("tombol");
if(oke.toString().equals("simpan")){
try {
koneksi konek = new koneksi();
Connection conn = konek.bukaKoneksi();
Statement stm = conn.createStatement();
String sql = "insert into mahasiswa(nim,nama,alamat) values ('"+nim+"','"+nama+"','"+alamat+"')";
stm.executeUpdate(sql);
conn.close();
out.print("berhasil input");
out.print("<a href='index.jsp'>Back</a>");
}

catch(Exception e) {
out.print(e);
}
}


%>

<form method="post" action="simpan.jsp">

nim <input type="text" name="txtNim">
Nama <input type="text" name="txtNama">
alamat <textarea name="txtAlamat"/>
<input type="submit" name="tombol" value="simpan">


</form>

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /simpan.jsp at line 7

4: String nama = request.getParameter("txtNama");
5: String alamat = request.getParameter("txtAlamat");
6: String oke = request.getParameter("tombol");
7: if(oke.toString().equals("simpan")){
8: try {
9: koneksi konek = new koneksi();
10: Connection conn = konek.bukaKoneksi();


Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:567)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:471)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause

java.lang.NullPointerException
org.apache.jsp.simpan_jsp._jspService(simpan_jsp.java:70)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.21 logs.

Apache Tomcat/7.0.21