asking about Enumerator.imperative[JsValue]() and Concurrent.hub[JsValue]

[yuk hei chan]

i have some problem in the coding  when i using the version 2.1.5 this two code have no error , but when i update the playframework to 2.2.1  

it sad the imperative is not the member of enumerator . what should i change to fix this error 

Enumerator.imperative[JsValue]() 

[value imperative is not a member of object play.api.libs.iteratee.Enumerator]

Concurrent.hub[JsValue]

[method hub in object Concurrent cannot be accessed in object play.api.libs.iteratee.Concurrent]

thank you