Adding an external jar library to Intellij IDEA - configuration

Question

I'm having a silly problem : I'm trying to add the Jsoup library (which is just an external jar) to my android application developed in Intellij Idea and it seems and don't do it right .
I put the library in the libs folder , then I went in Project Structure -> modules and selected dependencies , select add global library , select attach source and click ok.
When I write code it is able to automatically import classes and to compile , but when running I get " java.lang.NoClassDefFoundError: org.jsoup.Jsoup"

Answer 1

Copy the .jar file into your lib/ directory.
Right click the new .jar in the lefthand file browser in IntelliJ / Android Studio
Choose "Add as Library..."
Voila!

Answer 2

-Open the External Libraries node on the Left hand panel.
-Select Open Library Settings
-Project structure dialogue opens up.
Select the Libraries.
Click the "+" to browse the file.
![add external jar1

Answer 3

In IntelliJ IDEA 15 you can also access the Project Structure menu item from "File" item in the menu bar. Select Libraries from the list on the left. Click the "+" to browse the file, select it and you're done. It will be added to the "External Libraries" directory in your project.

Answer 4

Have a look at the newer artifacts section. Perhaps you don't add the JAR into your deployment properly.
UPDATE:
I'd like to update my answer based on lessons learned over the past six years since I first answered this question.
The best way to manage 3rd party JAR dependencies in Java projects is to learn Maven (my preference) or Gradle. IntelliJ has terrific integration with both.
If you combine those with an enterprise repository like Nexus you'll have no problems. Your dependencies and versions will be completely specified. Conflicts will be identified for you. Updates will be relatively simple.