In my honest opinion its because Java programmers are too lazy to learn their own eco system. I have been working with Java for 7+ years and id say maybe 10-20% of Java devs I have worked with have a good grasp of the basics such as Logging and dependency management (maven / gradle). The reason projects take so long to set up is because very few Java devs actaully spend to time to learn how to build their own projects from scratch. Most join a company follow whatever their setup is and thats that.
Ruby / node / python are tailored towards hobby developers and more often set up from scratch. A good java dev who understands their tools can set up a new Java server just as fast as a node / express server. The problem is most Java devs are lazy and just don't spend any time learning the basics.
You can also compare frameworks for instance Flask is probably much easier to get started with than Django in python but it doesn't do as much. In ruby sinatra would be eaisier to get started with than Rails. Node compares more to sinatra and flask than a larger framework. The Java ecosystem is mostly massive very old frameworks. However, there are plenty of lightweight ones as well which are starting to gain popularity. When you look at Scala and Kotlin using lower level frameworks why shouldn't we just do the same with Java?