How To Show Error In Jsp
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How To Display Error Message In Jsp
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How To Display Error Message In Jsp Using Javascript
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Servlet Redirect To Same Page With Error Message
Community Stack Overflow is a community of 4.7 million programmers, 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 Targhere for a quick overview of the site Help Center Detailed answers to any questions you how to display error message in login page using jsp might have Meta Discuss the workings and policies of this site how to display alert message in jsp page? About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or how to display error message in same jsp page using struts posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of http://stackoverflow.com/questions/21903765/displaying-error-message-in-login-page-after-login-failure 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How can I print error stack trace in JSP page? up vote 12 down vote favorite 2 I have set my error page like this in web.xml:
- 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 https://www.tutorialspoint.com/jsp/jsp_exception_handling.htm Handling JSP - Session 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 http://www.journaldev.com/2049/jsp-exception-handling-jsp-error-page JSP - Database Access JSP - XML Data JSP - Java Beans JSP - Custom Tags JSP - Expression Language JSP - Exception Handling JSP - Debugging JSP - Security JSP - Internationalization JSP Useful Resources JSP how to - Questions and Answers JSP - Quick Guide JSP - 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 how to display JSP code: Checked exceptions: Achecked exception is an exception that is typically a user 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 ThrowableQuestionsJava Interview QuestionsJDBC Interview QuestionsServlet Interview QuestionsJSP Interview QuestionsStruts2 Interview QuestionsSpring Interview QuestionsHibernate Interview QuestionsJSF Interview QuestionsResourcesStoreHome » Java » Java EE » JSP Exception Handling - JSP Error PageJSP Exception Handling - JSP Error PageSeptember 11, 2016 by Pankaj 3 Comments Exception handling in JSP is done by JSP exception pages.Exception Handling in JSPSometime back I wrote a post about Servlet Exception Handling and why do we need it. Same explanation is also applicable for JSP pages also and that's why Java EE provides a clear approach for exception handling in JSP using JSP error pages.To handle exceptions thrown by the JSP page, all we need is an error page and define the error page in JSP using jsp page directive.JSP Error PageTo create a JSP error page, we need to set page directive attribute isErrorPage value to true, then we can access exception jsp implicit object in the JSP and use it to send customized error message to the client.JSP Error Page ConfigurationWe need to set page directive errorPage attribute to define the JSP that will handle any exception thrown by the JSP service method. When JSP Error page is translated to servlet code, it extends org.apache.jasper.runtime.HttpJspBase in Tomcat.Error Page Deployment Descriptor ConfigurationMost of the times, we have a common error page that we want to use for all the JSPs, so rather than configuring it in all the JSPs individually, we can define error page in web.xml with error-page element. We can configure JSP error page to handle other error codes like 404 also.Let's see how all these fit together in a web application.We will create a simple web application JSPExceptionHandling whose project structure will look like below image. The entry point of the application is index.jsp whose code is given below. <%@ page language="java" contentType="text/html; charset=US-ASCII" pageEncoding="US-ASCII"%>