Unfortunately doesn't work with: vaadin.closeIdleSessions = true (in appli

Directory Idle Notification
1

Unfortunately doesn’t work with:

vaadin.closeIdleSessions = true (in application.properties)

Used the first code sample 1:1.
Console says:
java.lang.IllegalArgumentException: secondsBeforeNotification must be less than maxInactiveInterval

…But when setMaxInactiveInterval isn’t set. The default is 30min.

Is there any solution?