Asked by: Yumei Knoepke
Asked in category: technology and computing, web development
Last Updated: 7th May 2024
What tag is used to handle errors in JSP pages
Two attributes can be used for exception handling in JSP's page directive. These are: errorPage To site the page that will be displayed when exception occurs. isErrorPage: This page can be marked as an error page if exceptions are displayed.
Which code sets the JSP's error page correctly?
Use the %@ errorPage = "xxx") directive to create an error page. Now, we will write one error handling JSP showError. jsp is the following. The error-handling page also includes the directive %@ Page isErrorPage = %>.
How can a JSP error page be called by a servlet? (b) The JSP page will catch the exception if the servlet throws it. (c) The must forward the request to the error URL. An attribute called "javax" is used to pass the exception. servlet.
So, what exactly is exception handling in JSP
Exception handling is the process of dealing with runtime errors. exception can occur at any time in your web app. handling exceptions makes it safer for web developers. There are two options for handling exceptions in JSP: by errorPage or isErrorPage attributes.
What does JSP do with runtime exceptions in JSP?
If an uncaught exception is encountered, the errorPage attribute in the page directive can be used. redirects the browser the JSP page problem. JSP If an uncaught exception is encountered while processing the request.
17 Related Question Answers Found
What is error page in JSP?
JSP 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 JSP life cycle?
JSP Life Cycle is defined as translation of JSP Page into servlet as a JSP Page needs to be converted into servlet first in order to process the service requests. The Life Cycle starts with the creation of JSP and ends with the disintegration of that.
How are errors handled in JSP?
The page directive in JSP provides two attributes to be used in exception handling. They're: errorPage: Used to site which page to be displayed when exception occurred. isErrorPage : Used to mark a page as an error page where exceptions are displayed.
What are the two ways to include the result of another page?
There are two ways to include the result of another page:
- By include directive.
- By include action.
How do I fix null pointer exception?
These include:
- Calling the instance method of a null object.
- Accessing or modifying the field of a null object.
- Taking the length of null as if it were an array.
- Accessing or modifying the slots of null as if it were an array.
- Throwing null as if it were a Throwable value.
How do I debug a JSP page?
Procedure
- 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.
Which protocol Servlets and JSP communicate with clients?
First, JSP replies on HTTP protocol to provide client-server communication over the network. Second, JSP is built on top of Java servlet technology to simplify the development tasks for web developers.
Which one is the correct order of phases in JSP life cycle?
Which one is the correct order of phases in JSP life cycle? Explanation: The correct order is Compilation, Initialization, Execution, Cleanup.
What are custom tags in JSP?
JSP - Custom Tags. A custom tag is a user-defined JSP language element. When a JSP page containing a custom tag is translated into a servlet, the tag is converted to operations on an object called a tag handler. The Web container then invokes those operations when the JSP page's servlet is executed.
How is JSP used in the MVC model?
In this article, we have learnt about the MVC i.e. Model View Controller architecture. JSP plays the role of presentation of the data and controller. It is an interface between model and view while model connects both to the controller as well as the database. Main business logic is present in the model layer.
What is expression language in JSP?
Expression Language (EL) is mechanism that simplifies the accessibility of the data stored in Java bean component and other object like request, session and application, etc. There are many operators in JSP that are used in EL like arithmetic and logical operators to perform an expression. It was introduced in JSP 2.0.
What are directives in JSP?
JSP directives are the messages to JSP container. They provide global information about an entire JSP page. JSP directives are used to give special instruction to a container for translation of JSP to servlet code.
What are implicit objects in JSP?
JSP - Implicit Objects. These Objects are the Java objects that the JSP Container makes available to the developers in each page and the developer can call them directly without being explicitly declared. JSP Implicit Objects are also called pre-defined variables.
What is exception handling in Java?
Exception Handling in Java is a very interesting topic. Exception is an error event that can happen during the execution of a program and disrupts its normal flow. Java provides a robust and object oriented way to handle exception scenarios, known as Java Exception Handling.
Which of the following tag disables Scriptlets in JSP?
xml. The EL is intended to replace the use of Java scriptlets in developing JSPbased web applications. To this end, it's possible to disable the evaluation of scriptlets through configuration parameters. This allows a developer to ensure that no one inadvertently uses scriptlets instead of the EL.
What technique is used for the authentication mechanism in the servlet specification?
The authentication mechanism in the servlet specification uses a technique called role-based security. The idea is that rather than restricting resources at the user level, you create roles and restrict the resources by role. This file defines a simple mapping between username, password, and role.
Which exception is thrown for JSP related errors during compilation?
Exceptions occur when there is an error in the code either by the developer or internal error from the system. Exception handling in JSP is same as in java where we manage exceptions using try catch blocks. Unlike Java, there are exceptions in JSP also when there is an error in the code.
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