Failed to bind properties under 'logging.level' to issue the log level java.util.Map <java.lang.String, java.lang.String>

 

 

 

 The following should also be noted that, it tends to throw an exception:

Log wording is: logging.level (The code will auto-complete, do not just write, otherwise error) 
logging: 
      Level: Debug (this is a string, so throwing an exception) 
      Level key-value pairs in the form of a map 
      (key: the package name ) cn.itcast: debug (value: a class name) 
      org.springframework: Debug 
      ----------- 
logging: 
  level :( here can not have Debug) 
  cn.itcast: Debug 
  org.springframework: Debug