Setting environment variable in web.xml then accessing in portlet jsp

Step 1 :- Open your web application and double click on web.xml and then add any entry for environment as given below

<?xml version="1.0" encoding="UTF-8"?>

<web-app id="WebApp_ID" version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

<display-name>TrainingJ2eeApp</display-name>

<welcome-file-list>

<welcome-file>index.html</welcome-file>

<welcome-file>index.htm</welcome-file>

<welcome-file>index.jsp</welcome-file>

<welcome-file>default.html</welcome-file>

<welcome-file>default.htm</welcome-file>

<welcome-file>default.jsp</welcome-file>

</welcome-file-list>

<env-entry> 

    <env-entry-name>Key</env-entry-name> 

    <env-entry-type>java.lang.String</env-entry-type> 

    <env-entry-value>value</env-entry-value> 

</env-entry>

</web-app>

Step 2 :- Now create a asp and place below content in it to access the env value

<%!

public void jspInit() {

    System.out.println("env entries are being read and set..");

String rootPageName = null;

   String commonsHostURL = null;

   Context env = null;

   

try {

// Get a handle to the JNDI environment naming context

env = (Context)new InitialContext().lookup("java:comp/env");

} catch(javax.naming.NamingException e) {

e.printStackTrace();

}

try {

rootPageName = (String)env.lookup("key");

} catch(javax.naming.NamingException e1) {

e1.printStackTrace();

}

getServletContext().setAttribute("key", rootPageName);

}

%>

Step 3 :- Now you can access it were ever you need