Netbeans 20 Released
netbeans.apache.org
netbeans.apache.org
Not sure how all the various IDE's handle working with things like Make or Cmake for environments building with those tools, but I expect a similar pattern probably holds to a large extent. YMMV.
It also spins up something like 25 threads. Check your system monitor and despair.
25 threads are par for the course in Java applications. The GC alone has a few and Java Swing probably paints the application asynchronously. Then you still need a few threads for the application itself ;)
More informative page: https://github.com/apache/netbeans/releases/tag/20