Question

Here is the test.jsp

<%@ page import="java.util.*" %>
<%@ page import="java.io.*" %>
<%
    String str = request.getParameter("str");
    if (str.equals("play")) {
    }                  
%>

Errors:

type Exception report

message

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

exception

org.apache.jasper.JasperException: java.lang.NullPointerException

root cause java.lang.NullPointerException

note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 3.1.1 logs.

The above code have errors if run, what the problems of above codes?

Answer 1

Change if (str.equals("play")) to if (str!=null && str.equals("play"))

Your request parameter is null it seems.