How to make a POST REST call asynchronously in Java -

i have tried bunch of libraries make rest post call using httpconnection in java asynchronously. have tried many open source libraries , none of them seems serve purpose. there way in core java.

without knowing requirements or expectations:

here simple example without proper error handling shows how async http call can done using java 8

public static void main(string ... args) throws interruptedexception, executionexception, timeoutexception {     future<object> futureresult = getobjectasync();      object value = futureresult.get(500, timeunit.milliseconds); }  public static future<object> getobjectasync() {     return completablefuture.supplyasync(() -> dohttpcall()); }  static object dohttpcall() {     try {         httpurlconnection urlconnection =              (httpurlconnection) new url("http://example.net/something").openconnection();             urlconnection.setrequestmethod("post");         try (outputstreamwriter out = new outputstreamwriter(urlconnection.getoutputstream())) {             out.write("params json");         }          try (inputstreamreader in = new inputstreamreader(urlconnection.getinputstream())) {             // convert object             return new object();         }      } catch (ioexception e ) {         throw new runtimeexception(e);     } }