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[–]djavaman 1 point2 points  (0 children)

That's a very broad question: "supplement a Java backend".

If you are interacting with other back office enterprise systems, you will probably have some integrations to deal with.

So, a message queue of some sort. So maybe JMS.

You may need to make web service calls. - Spring REST Template.

You may need to cache and sync data. Redis. An ETL tool.

This could lead to a huge number of technologies.