Vaadin portlet2 archetype
· This archetype creates a simple porlet with required Vaadin dependencies. In addition to standard JSR 286 configurations the archetype also adds liferay specific configuration files, but they shoudn't affect other portals.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window vaadin-archetype-portlet-1.0.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.