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Since ClientErrorInterceptor does not exist in RESTeasy 3, its capabilities were removed from our client implementation, the REST client module. If you have been relying on such objects, you have to handle it in a different way.

Known issues

H2 doesn't accept more than one connection

Our default configuration is not using the server mode and therefore if one tries to initiate a backup call via CLI or REST, it will be failing due to the fact that H2 doesn't allow more than one connection at a time. We didn't have this issue in Magnolia before but for some reason (most likely due to H2 or Jackrabbit updates) we experience it now. A temporary workaround is to make H2 run in the server mode, by adding AUTO_SERVER=TRUE to the value of the url parameter:

<param name="url" value="jdbc:h2:${wsp.home}/db;DB_CLOSE_ON_EXIT=FALSE;AUTO_SERVER=TRUE" />

Green screen applauncher

If after upgrade or installation you experience a "green-screen" upon login (i.e. all apps are missing from the launcher) then most likely you have a module in your classpath which has not been migrated as part of the Vaadin 8 upgrade. In the log you will see "Definition not found" warnings due to the UI Framework not being able to start normally. This can be an issue when using third-party or add-on modules. Please read Vaadin 8 and custom modules.

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