java - Understanding External Class Folder -

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whilst learning develop servlets added c:\program files\apache\tomcat8\lib\servlet-api.jar j2ee project's build path servlets work. fine:

i decided instead add entire folder c:\program files\apache\tomcat8\lib "external class folder" , i'm "javax.servlet cannot resolved".

this seems make no sense when compared how eclipse adds tomcat library - looks identical:

[[3]

i guess questions are:

  1. what wrong including entire folder "library"?
  2. how 1 add folder appears proper library in "apache tomcat v8.0" library eclipse adds via wizard

class-folders folders compiled classes not folder libs. use user-library feature of eclipse in generell have add every jar hand.


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