Migration to vaadin 8 from vaadin 6


I am migrating my application from Vaadin 6 to Vaadin 8. We are using form class which is not present in Vaadin 8 so I added Vaadin compatible server.
The problem is , components inside the from are not getting visible on UI. i verified in debug mode, buttons/labels were not present in UI. but in intelij , we are able to see the components but somehow it is not getting visible at UI. can someone help me ?


Based on your description it is really hard to say what could be wrong. So instead of answering directly, I will point useful resources to you

There is documentation how to migrate from Vaadin 6 to Vaadin 7 here


On top of there there is further training material about migration from Vaadin 7 to Vaadin 8 here


I also recommend to create a simple Vaadin 8 application from the scratch or clone some known to work Vaadin 8 app so that you can compare what could be possibly wrong.