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 * [OSGi in Practice](http://njbartlett.name/files/osgibook_preview_20091217.pdf) (PDF)
 * [Sun's Java Tutorials](http://download.oracle.com/javase/tutorial/)
 * [Thinking in Java](http://www.mindview.net/Books/TIJ/)
-
+* [OOP - Learn Object Oriented Thinking & Programming](http://pub.bruckner.cz/titles/oop) - Rudolf Pecinovsky
 
 ####Wicket
 * [Official Free Online Guide for Apache Wicket framework](http://wicket.apache.org/guide/)