As it says in the API doc, this method appeared in Servlet API 2.3, which is covered on J2EE 1.3. Are you using an updated servlet-api.jar and servlet.jar (for example, from Tomcat 4.1 or 5.x or 6.x)? If you're developing using an IDE, look for the target J2EE, maybe it's configured by default to 1.2 or 1.1...
Joined: Feb 09, 2007
I have tried with the updated version(servlet-api.jar) also, still I am getting the same error.