Using ServletContext in java class

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Java

I have the data in the web.xml as

<context-param>
      <param-name>vDriver</param-name>
      <param-value>com.mysql.jdbc.Driver</param-value>
     <!-- <description> ClassLoader of Driver </description>-->
 </context-param>

 <context-param>
      <param-name>vConnection</param-name>
      <param-value>jdbc:mysql://localhost:3306/cdr555</param-value>
<!--      <description> Connection to Database </description>-->
 </context-param>

 <context-param>
      <param-name>vConnectionA</param-name>
      <param-value>jdbc:mysql://localhost:3306/maindata</param-value>
<!--      <description> Connection to Database </description>-->
 </context-param>

 <context-param>
      <param-name>vConnectionB</param-name>
      <param-value>jdbc:mysql://localhost:3306/states_ap</param-value>
<!--      <description> Connection to Database </description>-->
 </context-param>

 <context-param>
      <param-name>vConnectionP</param-name>
      <param-value>jdbc:mysql://localhost:3306/personal</param-value>
<!--      <description> Connection to Database </description>-->
 </context-param>


 <context-param>
      <param-name>vUsername</param-name>
      <param-value>root</param-value>
<!--      <description> Username of Database </description>-->
 </context-param>

 <context-param>
      <param-name>vPassword</param-name>
      <param-value>sigma</param-value>
<!--      <description> Password of Database </description>-->
 </context-param>

Now, I want to access these values in the java class file by using the code:

ServletContext sc =getServletConfig().getServletContext();
String vDriver = sc.getInitParameter("vDriver");
String vConnection = sc.getInitParameter("vConnection");
String vConnectionA = sc.getInitParameter("vConnectionA");
String vConnectionB = sc.getInitParameter("vConnectionB");
String vConnectionP = sc.getInitParameter("vConnectionP");
String vUsername = sc.getInitParameter("vUsername");
String vPassword = sc.getInitParameter("vPassword");

Using above code, I am retriving the values. But the values are not coming instead of that it is giving null values.

Please give the reply. its very urgent