strange error with spreadsheet add-on on Liferay

Flow
1

I’ve got that log:
​

02:24:07,346 WARN  [ajp-nio-8009-exec-2]
[com_vaadin_liferay_integration:103]
 UI services should have a prototype scope! Creating UI instance using the default constructor! 
02:24:07,355 ERROR [ajp-nio-8009-exec-2]
[PortletServlet:111]
 javax.portlet.PortletException: com.vaadin.server.ServiceException: java.lang.NoClassDefFoundError: com/vaadin/event/Action$Container
javax.portlet.PortletException: com.vaadin.server.ServiceException: java.lang.NoClassDefFoundError: com/vaadin/event/Action$Container

on that string:
spreadsheet = new Spreadsheet();
application jar started without errors and works correctly when compiled without spreadsheet initialization

What does it mean?

2

Can you post the project configuration and which bundles are installed on Liferay?

3

Hi Tulio,
My yesterday configuration doesn’t matter because it has been changed a lot of times since yesterday.
I would be satisfied with any working configuration.
The main problem is that vaadin-spreadsheet.jar consists a lot of libraries like Apache POI, which officially doesn’t support anything except Ant, and libraries like stax-api which was compiled under 1.6.
If you try to install vaadin-spreadsheet on Liferay 7, it will be unsuccessful.
Finally, I’ve made a lot of manipulations with content of spreadsheet jar and it’s manifest file, and it works now, but UI doesn’t look correctly under Liferay because of conflicting css.