How to Apply New Label Text in MDS Customisation

It may look simple, but really is not obvious how to apply new label text for the ADF BC attribute or UI component through MDS customisation. It is simple, if such label text already exists in the core bundle. If you need to create new label text in the customisation and use it - this becomes a bit tricky. Well, as usual - I'm going to explain how you could solve such task. You should read more about MDS customisation setup in ADF - MDS Seeded Customization Approach with Empty External Project.

Core application - mds_label_cust.zip, contains one label for First Name VO attribute:

The requirement is to customise core application and add label for the Last Name VO attribute, without changing anything in the core. For this purpose, we need to create different JDEV application - extension, configured with shared library deployment profile. Here you could simply create new properties file. We are going to use this application to deliver additional components for the core. Keep in mind - core application must be configured to use this library. Add label for Last Name VO attribute, in the properties file located in the extension:

Time for the main trick. We could use label directly from any resource bundle in the ADF application. This is accomplished through such expression - reference for the resource bundle and label key:

This code should be part of customisation project, on runtime it will find referenced resource bundle and label key in the resource bundle from extension (see above).

This is how it looks on runtime - label text is taken from resource bundle in extension and applied by customisation:

It sounds more tricky, than it is - just try it.