New JSP Error "The superclass" Javax.servlet.http.HttpServlet "is not found on the Java Build Path"

Today, when creating a new JSP file, the error "Visual page Editor has experimental support for Windows 64-bit", and then just stackoverflow above the solution with the wrong, Portal: HTTPS ://stackoverflow.com/questions/30274852/visual-page-editor-has-experimental-support-for-windows-64-bit, It is said to be the minor problem of JBoss, then follow the operation once, but still error, as follows:

It turns out that the Tomcat runtime related classes were not added to the project, so you need to do the following:

Right-click the project name->propertise->java build path->libraries->add libraries->server runtime-> Choose your Tomcat server- >finish

The error is gone.

New JSP Error "The superclass" Javax.servlet.http.HttpServlet "is not found on the Java Build Path"