But... that's the point of Maven and other package managers. Why does it need a UI like that? Unlike JS, the tradition in Java development is to use managed dependencies rather than download JARs for everything and throw them in /lib.
Maven needs a UI because of its pathologically-verbose XML syntax. Compare a pom.xml with its Gradle equivalent...only one is designed with humans in mind.
Which is why I said "and other package managers." My point was that a UI like the one to build a custom Bootstrap download doesn't make sense in the Java world because we have package managers, unmanaged dependencies are not the norm in most projects.
