to improve performance.

get rid of dependency on java.beans package, which is not included in
java 8 compact3 profile.

decommissioned ReconfigureOnChangeFilter and replaced it with  ReconfigureOnChangeTask, added ScheduledExecutorService to Context

fest-assert is a defunct library which was replaced by assertj.

migration notes here.

http://joel-costigliola.github.io/assertj/assertj-core-migrating-from-fest.html#fest-1.4