Create a Vaadin Portlet for Liferay

In this tutorial will be explained how to create a Vaadin Portlet for Liferay Portal from scratch.
We will use Eclipse Juno (but it applies to next versions as well), a Liferay Portal installation (version 6.1 in this tutorial) and the RIA framework Vaadin.

Liferay Tomcat as windows service

When Liferay Portal is bundled with Tomcat, it can be started as a windows service, so it can be automatically started at computer startup, without being logged in as windows user and without manually start through "startup.bat".
The procedure applies to a normal Tomcat installation as well, also without Liferay Portal.

Vaadin style not being applied to textfield

In Vaadin 6.8.6 I noticed that after declaring a TextField and after adding a style name, in some cases style doesn't apply in textfield.
I noticed that the issue was just on a TextField and I realized that the method "focus" strangely makes the style disappear.