the port has been usedになる。
↓
The best way to "fix" that is to not do it. Why would you need to run a maven goal from eclipse when you can just right click in the main class and
Run As->Java Application?boot dashboardも回避できる。
＝＞ boot dashboardの仕組みは？単純に実行したことを思えたかな？
あとで調べる