Passing initialization parameters to a servlet via annotations
Sometimes it is useful to pass some initialization parameters to a servlet. That way, we can make said servlet behave differently based on the parameters that are sent to it. For example, we may want to configure a servlet to behave differently in development and production environments.
In the old days, servlet initialization parameters were sent via the <init-param> parameter in web.xml. As of servlet 3.0, initialization parameters can be passed to the servlet as the value of the initParams attribute of the @WebServlet annotation. The following example illustrates how to do this:
package com.ensode.jakartaeebook.initparams;
//imports omitted for brevity
@WebServlet(name = "InitParamsServlet", urlPatterns = {
  "/InitParamsServlet"}, initParams = {
  @WebInitParam(name = "param1", value = "value1"),
  @WebInitParam(name = "param2"...
