java - Play Framework: Cannot find symbol "async" -

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I am using and I try to use the built in HTTP request in WS support I am doing Whenever I try this HTTP request in an administrator, I get this error 

  error:   
 for code   (static result) foo () {error on this line for async (// `async ') WS.url (GoogleStrategy.getTokenUrl) .post (getTokenUrlParams) .map (New F.Function & LT; WSResponse, Object & gt; () {@Override Public Object Applied (WSResponse wsResponse) Throwing Throws {OK Return (wsResponse.asJson ())}}})); }   
 It is weird because in all the examples shown in the documentation, this is the right way to do fast work which I want to do.   
 
 
 You were almost certainly looking at the old version of the document.  async ()  is no longer required.  
 Current version:  
  Public stable promise & lt; Results & gt; foo () {return WS.url (GoogleStrategy.getTokenUrl) .post (getTokenUrlParams) .map (New F.Function & LT; WSResponse, Result & gt; () {@Override Public Objects Applied (WSResponse wsResponse) The return is fine (wsResponse.jsjson ());}}); }

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