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 can you make JSP page as an error 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.
What is a JSP page?
A JSP page is a text document that contains two types of text : static data, which can be expressed in any text-based format (such as HTML, SVG, WML, and XML), and JSP elements, which construct dynamic content. The recommended file extension for the source file of a JSP page is .
How do you prevent page errors from printing in a JSP page?
There are two ways of handling exceptions in JSP. They are: By errorPage and isErrorPage attributes of page directive . By <error-page> element in web .
How can I get error code in JSP?
- web. xml file for specifying the error-page element.
- index. jsp for input values.
- process. ...
- error.
How can a servlet call an error JSP page?
If any type of exception occurs while executing an action, the servlet catches it, sets the javax. servlet. jsp. jspException request attribute to the exception object, and forwards the request to the error JSP page.
What is JSP life cycle?
A JSP life cycle is defined as the process from its creation till the destruction . This is similar to a servlet life cycle with an additional step which is required to compile a JSP into servlet.
Is JSP a front end?
JSP is built on top of the Java Servlet specification. ... While it is not uncommon to see JSP used as the frontend for older JSF applications, Facelets is the preferred view technology for modern JSF implementations. While JSP may not be your first choice for building dynamic web pages, it is a core Java web technology.
Why JSP is basically used today?
A) JSP stands for Java Server Pages, it is a server side technology which is used for creating dynamic web pages . It is the extension of servlets.
What is difference between HTML and JSP?
The main difference between JSP and HTML is that JSP is a technology to create dynamic web applications while HTML is a standard markup language to create the structure of web pages. ... On the other hand, JSP helps to create dynamic web applications. A JSP file consists of HTML tags and JSP tags.
What is debugging in JSP?
Debugging 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.
What is the difference between JSP and servlets?
Servlets are faster as compared to JSP, as they have a short response time. JSP is slower than Servlets , as the first step in the JSP lifecycle is the conversion of JSP to Java code and then the compilation of the code. ... JSP are HTML-based codes. Servlets are harder to code, as here, the HTML codes are written in Java.
Can a JSP page process HTML form data?
JSP handles form data processing by using following methods: getParameter(): It is used to get the value of the form parameter. getParameterValues():
How do I debug a JSP file?
- In the Project Explorer view, open your JSP file. ...
- Verify that you are using the Source page of the editor. ...
- From the JSP file’s context menu in the Project Explorer view, click Debug As> Debug on Server. ...
- In the Debug view, step through the code and make the necessary changes to the JSP file. ...
- Save the JSP file.
Can we use try catch in JSP?
You can catch exceptions in a JSP page like you would do in other Java classes. Simply put the code which can throw an exception/s between a try.. catch block. There is yet another useful way of catching exceptions in JSP pages.
What happens if an exception is thrown from a JSP?
If any exception occurs in the main JSP page the control will be transferred to the page mentioned in errorPage attribute . The handler page should have isErrorPage set to true in order to use exception implicit object.
