spring-boot learning path

Created a simple spring-boot project, and simply wrote a page. After starting the project access, the front-end page displays:

Whitelabel Error Page

For this thing, go to the console to find the error message and see:

2018-04-20 11:13:08.029 ERROR 10168 --- [nio-8080-exec-1] o.thymeleaf.templateparser.ErrorHandler  : [THYMELEAF][http-nio-8080-exec-1] Fatal error during parsing

org.xml.sax.SAXParseException:。。。。。。。。。。。。。

Finally found the reason, because the page's

<meta charset="UTF-8">

There is no "/" after

Change it to:

<meta charset="UTF-8"/>

After the problem is solved, record it here