If you run ADF 126.96.36.199 application with adaptive UI implemented by af:matchMediaBehavior tag (ADF 12.2.1 Responsive UI Improvements), most likely you will face Null Pointer Exception in Match Media Behavior tag class. Apparently af:matchMediaBehavior tag expects default value to be set on UI component. If default value is not set explicitly, it fails to read it and generates exception (this was not the case in ADF 12.2.1).
This example contains three af:matchMediaBehavior tags, properties orientation and styleClass are not set on panel spitter by default:
This leads into Null Pointer exception on runtime: Read the complete article here.
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