Error Handling And Debugging In Jsp Pdf
Contents |
by Hans Bergsten Published by O'Reilly Media, Inc. Java Server Pages Preface What’s in This Book Audience Organization About the Examples Conventions Used in This Book How to Contact Us Acknowledgments I. JSP Application Basics 1. Introducing JavaServer Pages 2. error handling and debugging in jsp pages HTTP and Servlet Basics 3. JSP Overview 4. Setting Up the JSP Environment II. JSP error handling and debugging in jsp ppt Application Development 5. Generating Dynamic Content 6. Using Scripting Elements 7. Error Handling and Debugging 8. Sharing Data Between JSP Pages, Requests,
Error Handling In Jsp
and Users 9. Database Access 10. Authentication and Personalization 11. Internationalization 12. Bits and Pieces III. JSP in J2EE and JSP Component Development 13. Web Application Models 14. Combining Servlets and JSP 15. Developing JavaBeans for JSP
Jsp Error Handling And Debugging
16. Developing JSP Custom Actions 17. Developing Database Access Components IV. Appendixes A. JSP Elements Syntax Reference B. JSP API Reference C. Book Example Custom Actions and Classes Reference D. Web-Application Structure and Deployment Descriptor Reference E. JSP Resource Reference Index Colophon Chapter 7. Error Handling and DebuggingWhen you develop any application that’s more than a trivial example, errors are inevitable. A JSP-based application is no exception. There are many types of errors you will deal with. sharing data between jsp pages Simple syntax errors in the JSP pages are almost a given during the development phase. And even after you have fixed all the syntax errors, you may still have to figure out why the application doesn’t work as you intended due to design mistakes. The application must also be designed to deal with problems that can occur when it’s deployed for production use. Users can enter invalid values and try to use the application in ways you never imagined. External systems, such as databases, can fail or become unavailable due to network problems.Since a web application is the face of a company, making sure it behaves well, even when the users misbehave and the world around it falls apart, is extremely important for a positive customer perception. Proper design and testing is the only way to accomplish this goal. Unfortunately, many developers seem to forget the hard-learned lessons from traditional application development when designing web applications. For instance, a survey of 100 e-commerce managers, conducted by InternetWeek magazine (April 3, 2000 issue), shows that 50% of all web site problems were caused by application coding errors. That’s the highest ranking reason in the survey, ahead of poor server performance (38%), poor service provider performance (35%), ... The best content for your career. Discover unlimited learning on demand for around $1/day. Get 10
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Sharing Data Between Jsp Pages Sharing Session And Application Data
- JSP Error PageSeptember 11, 2016 by Pankaj 3 Comments Exception conditional processing in jsp 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 https://www.safaribooksonline.com/library/view/java-server-pages/156592746X/ch07.html 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 http://www.journaldev.com/2049/jsp-exception-handling-jsp-error-page 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"%>
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