Undertow session timeout is set incorrectly

[FrontierPsychiatrist]

Spring Boot Version: 2.0.0.M7

The new support for Duration objects in configuration classes broke the session timeout setting when using Undertow.

This change sets the timeout as minutes but Undertow interprets the number as seconds.

So setting

server:
  session:
    timeout: 120

will actually result in a 2 second timeout for session.

Workaround: Specify the wanted seconds as minutes:

server:
  session:
    timeout: 120m

Edit:
To observe this you can set

logging:
  level:
    io.undertow.session: TRACE

and watch the logs for session invalidation.