The import com.mendix.systemwideinterfaces.connectionbus.ConnectionBus cannot be resolved

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Hi, Upon upgrading a Mendix project from 6.10.4 to 7.16.0, and running locally, I get these compile errors in some of my custom Java Actions: The import com.mendix.systemwideinterfaces.connectionbus.ConnectionBus cannot be resolved The import org.apache.poi cannot be resolved Any ideas would be greatly appreciated, thanks!  
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In Mendix 6, there were some Java libraries included automatically in every project, and that's not the case in Mendix 7. Here's the migration note: 

https://docs.mendix.com/refguide/moving-from-6-to-7#6-3-7-runtime-issues-when-migrating-a-project-to-mendix-7

Most likely you need to put an Apache POI JAR file in your project/userlib/ folder.

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