We have a 5 year old application written in vaadin 6. It only uses basic vaadin UI framework functions. If we want to upgrade to a newer vaadin version that will be supported, what is the version we should go to? I understand that moving from v6 to v7 and above requires some rework. Is vaadin 8 the best version to use to complete this UI migration? How long will vaadin 8 be supported? Are the UI framework stable after vaadin 8, i.e. upgrading to higher versions do not require changes in the application? Thanks for some guidance.
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Vaadin versions are either incremental or come with long-term support.
A long-term support version is maintained as an open source product for 5 years after the initial release. Additionally, Vaadin is offering commercial support for another 10 years. An incremental version is only maintained for a short overlap after the next version.
The other side of the coin is how easy it is to update your existing project. Vaadin 7 and Vaadin 8 is roughly the same from that point of view since Vaadin 8 also includes an extensive compatibility package that covers basically everything from Vaadin 7.
The jump to from Vaadin 6 to either Vaadin 14 or Vaadin 23 is bigger than the jump to Vaadin 8, but there isn't a big difference between 14 and 23 when it comes to the work needed for migrating from 6.