In the "Spring of actual combat", the creation of the first Spring applications, problems encountered,
Create application is Taco Cloud, a created after application, I will run the program, did not add any new code, the runtime will encounter errors, the error information is too much, I will not stick out, all is normal operation after the first line of the error message below,
18:16:01 2020-11-30. 9808-370 ERROR [restartedMain] O.A.C.C.C. [Tomcat] [localhost]. [/] : Exception sending the context the initialized the event to the listener instance of the class [com. Vaadin. Flow. Spring. VaadinServletContextInitializer $DevModeServletContextListener],
I think I'm the cause of the error may be because I operating some small differences and books, the following is a list of my operation and the operation of the textbook:
The Java version of book selection is 1.8, my version is 15, (I chose 15 version because I think the latest version must be the best, and the new usually compatible with the old version)
(2) application of book selection of dependency is Thymeleaf, DevTools, Web, the dependency is Thymeleaf, I choose Spring Boot DevTools, Spring Web, Spring Reactive Web, Spring Web Service, Jersey, Vaadin , (my dependencies and different because I can't find the books and books as dependencies, so chose looks very similar dependencies)
What the hell am I where wrong?