What is the right code for the error page in the deployment descriptor?
Java EE allows you to handle errors (by HTTP error codes and Java exception types) easily by putting some pieces of configuration in the web deployment descriptor document (the web. xml file). With this declaration, if any 404 error occurred, your own error page is displayed to the user (Error404.
What is failOnMissingWebXml?
The failOnMissingWebXml property is one of the properties of the Apache Maven war plugin, org. apache. maven. plugins:maven-war-plugin. xml file is not present, then the goal to package it as a war file will fail.
What is URL pattern in Web xml?
The element specifies a URL pattern and the name of a declared servlet to use for requests whose URL matches the pattern. The URL pattern can use an asterisk ( * ) at the beginning or end of the pattern to indicate zero or more of any character.
Which tag is used to declare error page in the deployment descriptor for the entire Web application?
Error Pages Mapped to Error Codes To map the error page to an HTTP error response status code, you use the tag within the tag to specify the error code to respond to. Such an error page is returned to the client only if the sendError method of the ServletResponse is invoked.
What is Tomcat Web XML?
XML. The web. xml file is derived from the Servlet specification, and contains information used to deploy and configure the components of your web applications. When configuring Tomcat for the first time, this is where you can define servlet mappings for central components such as JSP.
Are Servlets still used?
Servlets and JSPs are considered outdated technologies and no longer chosen for the new projects. These were found in use significantly for legacy projects. Servlet JSPs were used enormously in around 2000. With the popularity of emerging MVC frameworks like Struts, Webwork, Spring etc.
What is the difference between HTML and JSP?
JSP is a technology which is used to create dynamic web applications. HTML is a standard markup language which is used to create the structure of web pages. JSP allow to place the custom tag or third party tag. It does not allow to place the custom tag or third party tag.
When to throw an error code in web.xml?
When you have a URL that cannot be mapped to any sitemap item, a org.hippoecm.hst.core.container.ContainerNotFoundException is thrown which falls through all the way to the web container to finally match the web.xml configured 404 .
How to handle 400 errors in web.xml?
400 (Bad Request) errors are handled directly by Tomcat and not delegated to the webapp. Therefore, it is not necessary to configure an error page for 400 errors in web.xml. Not all error codes and exceptions should be handled this way.
When to use web.xml as a last fallback?
The web.xml error pages should be used as a last fallback solution, for example when the HST sends a HttpServletResponse.SC_SERVICE_UNAVAILABLE, or 503 as error-code. With this solution, you cannot use any tooling from the HST, as it is out of the scope of the HST request processing.