Jsp Error Message Example
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How To Display Error Message In Jsp Using Javascript
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just like you, helping each other. Join them; it only takes a minute: Sign up displaying error message in login page after login failure up vote 1 down vote favorite 2 here is some part of code from login.jsp login.jsp
Login
<%=request.getAttribute("errorMessage") %>
in the servlet code if the user does't exist i'm using requestdispatcher with error msg servlet if(res.next()) { if ((thisname.equals(res.getString("username"))) && (thispwd.equals(res.getString("password")))) { session.setAttribute("username", request.getParameter("username")); response.sendRedirect("login-success.html"); } else{ session.invalidate(); request.setAttribute("errorMessage", "Invalid user or password"); RequestDispatcher rd = request.getRequestDispatcher("/login.jsp"); rd.forward(request, response); } but thing is<%=request.getAttribute("errorMessage") %>
runs whenever login jsp is opened which returns null on the page when there is no failure.only when the failure occurs it displays "invalid user or password" .so i want to check if request.getAttribute("errorMessage") is null . is its not then invoke<%=request.getAttribute("errorMessage") %>
. how do i do it? or is there a better way jsp servlets share|improve this question asked Feb 20 '14 at 9:38 Rajshekar Targar 623412 Here the jsp for example runs just as a static html in case of h2, give a condition that returns the value in h2 only afterTutorial Categories: Ajax (1)Ant (16)Apache Web Server (8)Bioinformatics (10)Cascading Style Sheets (47)Classes and Objects (14)Database (13)Design Patterns (22)Eclipse (39)Files (62)General Java (69)JSPs (9)Java how to display alert message in jsp page Basics (11)Linux (23)Logging (5)Maven (88)Search (12)Servlets (20)Struts (1)Text (19)Tomcat (8)Version Control (8)Windows (2)XML how to display error message in login page using jsp (1) How do I create a JSP error page to handle exceptions? Author: Deron Eriksson Description: This Java tutorial describes how to display error message in same jsp page using struts how to create a JSP error page to handle exceptions. Tutorial created using: Windows XP || JDK 1.5.0_09 || Eclipse Web Tools Platform 2.0 (Eclipse 3.3.0) || Tomcat 5.5.20 Page: 1 2> http://stackoverflow.com/questions/21903765/displaying-error-message-in-login-page-after-login-failure When an exception is thrown in your web application and it is not caught, you will typically see the result featuring the exception displayed in your browser window, as shown here: Rather than displaying the above default page when an exception occurs, you can redirect the user to a custom-written error page for a particular type of exception. You can do this via the error-page element http://www.avajava.com/tutorials/lessons/how-do-i-create-a-jsp-error-page-to-handle-exceptions.html in web.xmlW, in which you can specify an exception-type and the location of the resource where a user should be sent if an error occurs. In this example, I specified the exception-type as java.lang.Throwable so that all exceptions would be sent to the error.jsp page.
- Life Cycle JSP - Syntax JSP - Directives JSP - Actions JSP - Implicit Objects JSP - Client Request JSP - Server Response JSP - Http Codes JSP - Form Processing JSP - Writing Filters JSP - Cookies Handling JSP - Session https://www.tutorialspoint.com/jsp/jsp_exception_handling.htm Tracking JSP - File Uploading JSP - Handling Date JSP - Page Redirect JSP - Hits Counter JSP - Auto Refresh JSP - Sending Email Advanced JSP Tutorials JSP - Standard Tag Library JSP - Database Access JSP - XML http://www.javapractices.com/topic/TopicAction.do?Id=220 Data JSP - Java Beans JSP - Custom Tags JSP - Expression Language JSP - Exception Handling JSP - Debugging JSP - Security JSP - Internationalization JSP Useful Resources JSP - Questions and Answers JSP - Quick Guide JSP - how to Useful Resources JSP - Discussion Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who JSP - Exception Handling Advertisements Previous Page Next Page When you are writing JSP code, a programmer may leave a coding errors which can occur at any part of the code. You can have following type of errors in your JSP code: Checked exceptions: Achecked exception is an exception that is typically a user how to display error or a problem that cannot be foreseen by the programmer. For example, if a file is to be opened, but the file cannot be found, an exception occurs. These exceptions cannot simply be ignored at the time of compilation. Runtime exceptions: A runtime exception is an exception that occurs that probably could have been avoided by the programmer. As opposed to checked exceptions, runtime exceptions are ignored at the time of compliation. Errors: These are not exceptions at all, but problems that arise beyond the control of the user or the programmer. Errors are typically ignored in your code because you can rarely do anything about an error. For example, if a stack overflow occurs, an error will arise. They are also ignored at the time of compilation. This tutorial will give you few simple and elegant ways to handle run time exception/error occuring in your JSP code. Using Exception Object: The exception object is an instance of a subclass of Throwable (e.g., java.lang. NullPointerException) and is only available in error pages. Following is the list of important medthods available in the Throwable class. SNMethods with Description 1public String getMessage()
Returns a detailed message about the exception that has occurred. This message is initialized in the Throwable constructor. 2public Throwable getCause() Returns the cause of the exception as represented by a Throwable object. 3public String toString() Returns the name of the class concatenated with the resHere is an example of such an entry in web.xml: