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According to the summary. If I create bean with two local interfaces, methods just from the one are displayed because AbstractMethodController takes care just about the one interface. It was not supposed that more of them could be available (although it was possible also earlier), so it's quite core functionality to change.
The DD models are very outdated and as we agreed it doesn't have sense to update them until we get valid user request. The AbstractMethodController could at least leverage information get from the annotation based model. It should work with arrays of the businessRemote and businessLocal interfaces. I started with initial implementation but it looks to be pretty big change and many places for regressions, postponing into the next release.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss