scala - Play 2.5 preserve context in async calls -

in our controller class reach out service data :

future<jsonnode> futuresite = someclient.getsite(siteid, queryparams);  return futureconverters.tojava(futuresite).thenapplyasync((sitejson) -> {     site site = json.fromjson(sitejson, site.class);     try {         return function.apply(site);     } catch (requestexception e) {         return e.result;     } }).exceptionally(throwable -> {     if(throwable instanceof ourclientexception) {         if(((ourclientexception) throwable).httpstatuscode == 404) {            return entitynotfound("site", siteid);         }     }     return null; }); 

what notice context set in unit tests (we use scalatest-play) lost , becomes null after make async call (futureconverters.tojava(futuresite).thenapplyasync((sitejson), t on separate thread.

which causes problem down in controller code, use above function ... request() throw runtime exception saying there no context available.

how can preserve context ?

you should inject play.libs.concurrent.httpexecutioncontext controller , specify current context second argument completionstage#thenapplyasync(..,..).

public class application extends controller { @inject httpexecutioncontext ec;  public completionstage<result> index() {     somecompletablefuture.supplyasync(() -> {        // request()     }, ec.current()); }} 

p.s. https://www.playframework.com/documentation/2.5.x/javaasync#using-completionstage-inside-an-action