Eclipse Add jar (servlet API)

Right-click your project directory Select the last item "Properties" Properties and select "java build path " Java build path right tab third item "Library" Libraries and then point to the right

"add jars " add jars   (this is to find the jar package from the project) or choose the second one.

jars " add external  jars

then find the package ( Here's a blur, easy to add the wrong jar: in fact, I needed to add a servlet package, but

I was confused to add the common. Jar package, Therefore, always thought that it was not added successfully , in fact, add is successful, but the wrong jar,

What I really need to add is the Apache Tomcat installation directory Lib Servlet-api.jar), added to the line;