Servlet tag and servlet mapping tag are present in the web.xml as shown below
<servlet>
<servlet-name>AbcServlet</servlet-name>
<servlet-class>edu.studies.service.AbcServlet</servlet-class>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>AbcServlet</servlet-name>
<url-pattern>/abc/*</url-pattern>
</servlet-mapping>
But it still says The requested resource (Servlet AbcServlet is not available) is not available. What did I miss? Please help.