GXT 2.3.1 to 4.0.2 migration

Hello,

We used to have GWT 2.4 & GXT 2.2.5 and we migrated to GWT 2.8.1.

Now I am using GWT 2.8 with gxt 2.2.5 and Jdk 1.8.0_291, even when upgrading gxt-2.3.1a-gwt22 I still get this error when maven is building I got this error

jar:file:/war/WEB-INF/lib/gxt-2.3.1a-gwt22.jar!/com/extjs/gxt/ui/client/widget/form/ListField.java' > Line 322: The method append(boolean) is ambiguous for the type > StringBuffer

After searching I thought it is imposible to resolve it, I don't have the right to edit the dependency.

So I decided to upgrade gxt to 4.0.2, am I right?

but when I did all the app broke, most of the Types don't exist anymore and the migration is not well documented on sencha website, they provide a unique page that doesn't help.

Do you have  a tutorial or a guide that helps? or maybe a workaround?

Thanks

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