How does Error handling is done in JSP?

How does Error handling is done in JSP?

There are two ways of handling exceptions in JSP. They are: By errorPage and isErrorPage attributes of page directive. By element in web.

What is error handling and debugging in JSP?

When 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. Simple syntax errors in the JSP pages are almost a given during the development phase.

What is JSP error?

While a JSP page is executing and processing client requests, runtime errors can occur either inside the page or outside the page (such as in a called JavaBean). This section describes the JSP error processing mechanism and provides a simple example.

How do you handle ServletException?

If the web application throws either ServletException or IOException, then the web container invokes the /ErrorHandler servlet. You can define different Error Handlers to handle different type of errors or exceptions. Above example is very much generic and hope it serve the purpose to explain you the basic concept.

How can I get error message in JSP?

To 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.

Is error page is by default true?

The errorPage attribute tells the JSP engine which page to display if there is an error while the current page runs. The value of the errorPage attribute is a relative URL. The value of isErrorPage is either true or false. The default value of the isErrorPage attribute is false.

What are doGet () and doPost () methods?

The doGet() method is used for getting the information from server while the doPost() method is used for sending information to the server.

Which JSP life cycle is in correct order?

Which one is the correct order of phases in JSP life cycle? Explanation: The correct order is Compilation, Initialization, Execution, Cleanup.

What is the syntax of page directive?

JSP directives are the elements of a JSP source code that guide the web container on how to translate the JSP page into it’s respective servlet. Directives can have a number of attributes which you can list down as key-value pairs and separated by commas.

How to handle a servlet exception in Java?

Sometime back I wrote a post about Exception Handling in Java but when it comes to web application, we need more than normal exception handling in java. If you notice, doGet () and doPost () methods throw javax.servlet.ServletException and IOException, let’s see what happens when we throw these exception from our application.

Can a JSP page be used as an exception handler?

You can also use JSP page as exception handler, just provide the location of jsp file rather than servlet mapping. That’s all for servlet exception handling in web application, I hope you liked it.

How to create a servlet for an error page?

As you can see, it’s very easy to specify Exception handler servlets for the application using error-page element. Each error-page element should have either error-code or exception-type element. We define the exception handler servlet in location element.

What happens if I send an invalid request to a servlet?

If we send request for an invalid URL, we get response HTML like below image. Again it’s a generic HTML generated by server on our application behalf and hold little to no value to the user. Servlet API provides support for custom Exception and Error Handler servlets that we can configure in deployment descriptor.