DEPLOYMENT DESCRIPTOR

       DEPLOYMENT DESCRIPTOR

Q) What is DEPLOYMENT DESCRIPTOR (DD) ? How many DEPLOYMENT DESCRIPTORS are available ?

  
Def of  DEPLOYMENT DESCRIPTOR (DD): Deployment descriptor is an XML file that describes how to deploy a module or application by specifying configuration and container options. 

                                           (or)

---->  deployment descriptor describes how a web application or enterprise application should be deployed. It directs a deployment tool to deploy a module or application with specific container options, security settings and describes specific configuration requirements



---> For example, an EJB deployment descriptor passes information to an EJB container about how to manage and control an enterprise bean



---->  This file is web.xml

-----> This is an xml file. It tells to the server about the application.

-----> Each web application contain one deployment descriptor

                                  (OR)

 ----> Deployment descriptors are used specify the information that is used to deploy the application on the server.
                                  
                                              (OR)



----->  Deployment Descriptor is an xml file which contains information about runtime properties of the specific application.

                

A) ----> A DEPLOYMENT DESCRIPTOR (DD) refers to configuration file that is deployed to some Container/Engine

    -----> DEPLOYMENT DESCRIPTOR (DD) describes how web application or Enterprise Application should be deployed.

  ------> It directs deployment tool to deploy module application with Container options

 ------> Security Settings and Configuration requirements.

------> XML is used as Syntax for DEPLOYMENT DESCRIPTOR.

   
Two Types of DEPLOYMENT DESCRIPTOR .



1) WEBAPPLICATION DEPLOYMENTDESCRIPTOR

2) PORTLET DEPLOYMENTDESCRIPTOR




1) web.xml : The web.xml defines the Web application being deployed. This section will detail the required elements of the web.xml when deploying a portlet application.

2) Portlet.xml 
                               (OR) 



----> Deployment Descriptor describes how a web application or enterprise application to be deployed.
----> Pre-complie JSP should be done default.
       

 There are 3 types.


1)  JAR file= Collection of class files
2)  WAR file =Collection of Class, JSP,XML files.
3)  EAR file=Collection of JAR,WAR and EJBs.