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  1. 01-29-2012, 09:23 AM #1
    donewithmytime
    donewithmytime is offline Member
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    Default Input Validation Error

    Hi there,

    I was trying an input validation example taken from the OWASP ESAPI and I am getting the following error:

    Error: Cannot make a static reference to the non-static method getValidInput(String, String, String, int, boolean) from the type Validator

    Html:

    Java Code: 
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<form method="post" action="inputvalidation">
		Enter zip:<input type="text" name="zip" />
	</form>
</body>
</html>

    Servlet

    Java Code: 
    package com.example.web;

import java.io.IOException;
import java.io.PrintWriter;
import org.owasp.esapi.*;
import org.owasp.esapi.errors.ValidationException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class InputValidation extends HttpServlet {
private static final long serialVersionUID = 1L;
   
    public InputValidation() {
        super();
        // TODO Auto-generated constructor stub
    }


	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html");
		PrintWriter out=response.getWriter();

		
		try
		{
			 String zipCode=Validator.getValidInput("ChangeAddressPage_ZipCodeField",
                         request.getParameter( "zip" ), 
                          "zipCodePattern", 10, false); //Error on this line 
			 out.print(zipCode);
				 
		}
		catch(ValidationException e)
		{
			response.sendError( response.SC_BAD_REQUEST, e.getMessage() );
		}
	}

}
    Any suggestions?
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  2. 01-29-2012, 02:02 PM #2
    Norm's Avatar
    Norm
    Norm is offline Moderator
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    Default Re: Input Validation Error

    Cannot make a static reference to the non-static method
    Create an instance or get a reference to the class and use that reference to call the method.
    Or make the method static

    This syntax: CLASSNAME.methodName is a static refererence.
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