As you may know, if you have servlets in you Java project you need to add servlet-api.jar to you Web App Libraries. Since I don’t work in Eclipse very often, I always keep forgetting how to do it. So, here is a short instruction with pictures.
Go to Web App Libraries/Build Path/Configure Build Path…
Click Add External JARs…
Find and choose the servlet-api.jar file. It should be located in the lib folder of your Tomcat. In my case the path to the file is:
/usr/local/apache-tomcat-8.0.33/lib/servlet-api.jar
