Java Servlet Annotations provide a way to simplify the configuration of servlets in a web application. Instead of using XML files to configure servlets, you can use annotations to specify the URL mapping, initialization parameters, and other configuration settings. Here are some commonly used Servlet Annotations:

1. @WebServlet - This annotation is used to specify the URL pattern for a servlet. For example:

@WebServlet("/MyServlet")
public class MyServlet extends HttpServlet {
  // servlet code here
}

In the above example, the servlet is mapped to the URL pattern /MyServlet.

2. @WebInitParam - This annotation is used to specify initialization parameters for a servlet. For example:

@WebServlet("/MyServlet")
@WebInitParam(name = "myParam", value = "myValue")
public class MyServlet extends HttpServlet {
  // servlet code here
}

In the above example, the servlet has an initialization parameter named myParam with a value of myValue.

3. @WebFilter - This annotation is used to specify a filter for a web application. For example:

@WebFilter("/MyServlet")
public class MyFilter implements Filter {
  // filter code here
}

In the above example, the filter is mapped to the URL pattern /MyServlet.

4. @WebListener - This annotation is used to specify a listener for a web application. For example:

@WebListener
public class MyListener implements ServletContextListener {
  // listener code here
}

In the above example, the listener is invoked when the web application is started or stopped.

Annotations can make your servlet code more concise and easier to read, as configuration settings are specified in-line with the servlet code. However, be aware that using annotations can make it harder to see the configuration settings for a servlet at a glance, as they are not all in one place. Additionally, older web application servers may not support annotations, so you may need to use XML configuration files instead.