Table of Contents
What is the use of welcome-file-list in web xml?
The web. xml file’s welcome-file-list property is used to establish a list of welcome files. If you don’t supply a file name while loading the project in the browser, the tag is used to define the files that will be called by the server by default.
What is web xml file in servlet?
Java web applications use a deployment descriptor file to determine how URLs map to servlets, which URLs require authentication, and other information. This file is named web. xml , and resides in the app’s WAR under the WEB-INF/ directory. web. xml is part of the servlet standard for web applications.
What is context param in web xml?
The “context-param” tag is define in “web. xml” file and it provides parameters to the entire web application. For example, store administrator’s email address in “context-param” parameter to send errors notification from our web application.
How are servlets loaded on startup?
The element ‘load-on-startup’ is used to load the servlet. The ‘void init()’ method of servlet gets executed when the server gets started. The element content of ‘load-on-startup’ is Integer. if the integer is negative: The container loads servlet at any time.
What is init param in servlet?
The init-param element within a filter or servlet definition element contains initialization parameters for that filter or servlet instance. These are distinct from context parameters, discussed in Section 4.7. Each init-param contains a param-name element and a param-value element.
How do I add a context root in web xml?
To Set the Context Root A context root must start with a forward slash (/) and end with a string. In a packaged web module for deployment on the GlassFish Server, the context root is stored in glassfish-web. xml.
How do you set servlet to initial parameters?
To view this administrative console page, click Applications > Application Types > WebSphere enterprise applications > application_name > Init parameters for servlets. This page is the same as the Init parameters for servlets in each web module panel on the application installation and update wizards.
How the servlet is loaded?
This process of loading a java servlet before receiving any request is called preloading or preinitialization of a servlet. Servlet are loaded in the order of number(non-zero-integer) specified. That is, lower(example: 1) the load-on-startup value is loaded first and then servlet with higher values are loaded.
What is init param in web xml?
This is an element within the servlet. The optional init-param element contains a name/value pair as an initialization parameter of the servlet. Use a separate set of init-param tags for each parameter. You can access these parameters with the javax.
What is load on startup in servlet?
The element load-on-startup indicates that this servlet should be loaded (instantiated and have its init() called) on the startup of the Web application. The element content of this element must be an integer indicating the order in which the servlet should be loaded.
What is welcome-file-list in web XML?
welcome-file-list in web.xml The welcome-file-list element of web-app, is used to define a list of welcome files. Its sub element is welcome-file that is used to define the welcome file. A welcome file is the file that is invoked automatically by the server, if you don’t specify any file name.
What is a welcome file in a server?
A welcome file is the file that is invoked automatically by the server, if you don’t specify any file name. By default server looks for the welcome file in following order: welcome-file-list in web.xml.
How do I map a Java servlet to a web page?
For a Java servlet to be accessible from a browser, you must tell the servlet container what servlets to deploy, and what URL’s to map the servlets to. This is done in the web.xml file of your Java web application. Configuring and Mapping a Servlet. To configure a servlet in the web.xml file, you write this:
How to pass parameters to a servlet from the web?
You can pass parameters to a servlet from the web.xml file. The init parameters of a servlet can only be accessed by that servlet. Here is how you configure them in the web.xml file: