How do I display error messages in the same JSP page?
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.
How can I invoke a JSP error page from a servlet?
Invoking a JSP Page from a Servlet
- Get a servlet context instance from the servlet instance:
- Get a request dispatcher from the servlet context instance, specifying the page-relative or application-relative path of the target JSP page as input to the getRequestDispatcher() method:
What type of errors can a JSP code encounter?
There are three types of exceptions in JSP; these are: Checked Exception. Runtime Exception. Errors Exception.
How can we stop errors on display in a JSP page?
In JSP, there are two ways to perform exception handling: By errorPage and isErrorPage attributes of page directive. By element in web. xml file….There are 3 files:
- index. jsp for input values.
- process. jsp for dividing the two numbers and displaying the result.
- error. jsp for handling the exception.
What is error page in JSP?
JSP gives you an option to specify Error Page for each JSP using page attribute. Whenever the page throws an exception, the JSP container automatically invokes the error page. Following is an example to specifiy an error page for a main. jsp. To set up an error page, use the <%@ page errorPage = “xxx” %> directive.
What is isErrorPage in JSP?
The isErrorPage attribute indicates that the current JSP can be used as the error page for another JSP. The value of isErrorPage is either true or false. The default value of the isErrorPage attribute is false.
Can a JSP be called using servlet?
Invoking a JSP Page from a Servlet. You can invoke a JSP page from a servlet through functionality of the standard javax. servlet. RequestDispatcher interface.
How can a servlet call error page?
(b) When the servlet throws the exception, it will automatically be caught by the calling JSP page. (c) The servlet needs to forward the request to the specific error page URL.
How do you comment on a JSP page?
There are multiple way to comment in a JSP file.
- < %– comment –%> A JSP comment. Ignored by the JSP engine.
- An HTML comment. Ignored by the browser.
- < % my code //my comment %> Java Single line comment. Ignored by the Compiler.
- < % my code /** my comment **/ %>
What is error handling and debugging in JSP?
Debugging in JSP is the process to trace the error in the application. It is not very easy to trace bugs and error in the application. JSP applications are client interactive. Hence, errors are difficult to reproduce.
How do I add an error page in Web XML?
The error page can be either a static HTML file, or a JSP, or servlet. To map the error page to an HTTP error response status code at design time, you use the tag within the tag in the web. xml deployment descriptor to specify the error code to respond to.
Which tag is used for error handling in JSP pages?
Error handling at the page level A JSP page can specify its own default error JSP page from an exception that is occurring within it, through the JSP error tag. This enables a JSP page to specify its own handling of an error.
How does the Servlet check the user input?
So, you can use Servlet to check the user input against database and display the message to the user. This example illustrate how to ensure that user input is correct by validating against the database. In this example any error on the user end is checked by the servlet.
How to display error message based on user input?
Servlet Error Message based on user input. In this example user is presented with a screen to enter the name. If the entered name exists in the database its displays the sucess message otherwise it displays the error message. So, you can use Servlet to check the user input against database and display the message to the user.
Can a error message be visible to all users?
If you set an error message as an application attribute it will be visible to ALL users, not only to the one that submitted the wrong data. OK, here is a primitive example.