登录不打印方法名称

Question

using logback classic in java app but %M or %method prints a '?' instead of method name. anyone has an idea ? here is the pattern

%d{yyyy-MM-dd HH:mm:ss.SSS} %level %thread %mdc{X-CorrelationId} %logger %method - %msg%n

Answer 1

logback emits ? instead of the method name only when the method name could not be determined . Assuming this is a non-production app, make sure to enable debug symbols for the method name to appear for %m .

Answer 2

If you are using or , then you should know about property. This property is set to false because retrieving caller data is very expensive. Hence things like line number or method name are not retrieved by default.
In your case method name gets replaced by a which is basically

So, add this line to your logback.xml

<includeCallerData>true</includeCallerData>