我尝试更改 Spring Boot 应用程序的端口，激活 Vaadin PRO，在 Eclipse/PowerShell 中运行，在调试和不调试的情况下运行...我也安装了node.js 12.16.1（包括 npm 6.13.4）。我总是收到错误：java.lang.RuntimeException: 无法初始化 Vaadin DevModeHandler
:: Spring Boot :: (v2.2.4.RELEASE)
2020-03-16 07:34:43.681 INFO 12284 --- [ main] s.q.myapp.ui.MyAppWebApplication : Starting MyAppWebApplication on luigi10 with PID 12284 (C:\Workspaces\myapp\myapp\myapp-web\target\classes started by luigi.k in C:\Workspaces\myapp\myapp\myapp-web)
2020-03-16 07:34:43.684 INFO 12284 --- [ main] s.q.myapp.ui.MyAppWebApplication : No active profile set, falling back to default profiles: default
2020-03-16 07:34:44.734 INFO 12284 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8082 (http)
2020-03-16 07:34:44.744 INFO 12284 --- …