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  • Some of our users reported that the UI Builder no longer opens. Or that the UI Builder displays an error message after trying to open a window. We are aware of this problem but it is not a bug of the IDE it is more a combination of a wrong configuration of the project and the UI Builder. For a better understanding, here is a detailed description: A single window in the UI Builder is an actual started instance of the window or java class. That means when a single window is opened in the UI Builder the whole project is initialized and started as an app in the background. If there is a wrong configuration in the project that prevents the app from starting up due to an exception, the UI Builder won't start. Some known misconfiguration are:

    • A wrong configuration of the navigation. Duplicate route names, wrong parent layouts and so on.

    • Wrong @Push annotations or a wrong Push configuration

    • Wrong or incompatible framework versions within the pom.xml e.g. using RapidClipse framework version 11 within IDE 10.4

    • Using Vaadin plugins designed for NPM within IDE below Version 11

  • If you are facing this issue check your last changes to the project, there might be some misconfiguration in it.

  • Some of our users reported that the Import or Export of entities leads to a ClassCastException within the IDE. The reason is an update of the Hibernate version of the IDE from 5.3 to 5.4. If u facing these exceptions try to change the used Hibernate version in your project. See following steps:

    • Rightclick on the Project → Properties

    • Search for “Hibernate“ witin the properites and choose “Hibernate settings“ → Click on “Details“

    • In the following Dialog you can choose the Hibernate version for this project → Choose version 5.4

  • Some of our users reported that they could not start the project. Please check your used RapidClipse framework version in the pom.xml and ensure that the version 10.4 is set. Sometimes version 11 is set and this is not a valid configuration because RapidClipse 10.04.00 project are not yet compatible to RapidClipse 11.00.00 framework.