How to know which servlet and JSP version am I using?

You can easily check the JSP,SERVER and SERVLET version. Add the following code in your jsp page after that run using any IDE Tools.

Server Version: <%= application.getServerInfo() %><br>
Servlet Version: <%= application.getMajorVersion() %>.<%= application.getMinorVersion() %>
JSP Version: <%= JspFactory.getDefaultFactory().getEngineInfo().getSpecificationVersion() %> <br>