playframework - Play framework 2, how to use execution context in Java? -

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the official documents describe how use in scala. http://www.playframework.com/documentation/2.1.0/threadpools.

future {   // blocking or expensive code here }(contexts.myexecutioncontext)

i can excutioncontext like: 

executioncontext myexecutioncontext = akka.system().dispatchers().lookup("my-context");

but how add in code blow? 

return async(     future(new callable<string>() {         public string call() {               return dosth();         }).map(new f.function<string,result>() {            public result apply(string i) {               return ok(i);            }         })

i think answer should be：

    executioncontext myexecutioncontext = akka.system().dispatchers().lookup("my-context");     return async(             akka.aspromise(futures.future(new callable<string>() {               public string call() {                 return dosth();               }                }, myexecutioncontext)).map(new f.function<string,result>() {               public result apply(string i) {                 return ok(i);               }             })     );

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