If someone wants to integrate Skype services and functionalities inside a Java program, the best Java API it’s always been Skype4Java. The problem is that the library has not been updated since 2006 and it is quite old to fully manage all the Skype features and it is not compatible with Java 64 bit installations.
BUT now the things are changed!!!
Thanks to Gabriel Takeuchi, Skype4Java revives with a new name and version!

skype-java-api 1.1

The library starts to be a clone of the old Skype4Java, solving some bugs and adding new features and methods:

getLanguageByISOCode()

is an example that permits to get the user language returning the language ISO code and not its full name.. I think it is a really useful method!

 ( Italian -> it )

The library is compatible with Windows , Linux 64bit and MacOs but soon it will be compatible also with Linux 32bit as well.

Any reference to SWT library have been erased making this peace of software more fast and reliable.

Here it is the link for the download from Maven repo and here it is the link to the developer blog .