專案報錯：

Error parsing HTTP request header
 Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.

java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens

檢視專案發現 server.port=8888
改為server.port=8080 解決問題

專案報錯：

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'user0_.user_name' in 'field list'

發現bean類（欄位駝峰）：

String userName;

資料庫中也是userName
解決：
將資料庫中駝峰格式寫成user_name