java library which enables composing futures (flatMap) asynchronously -

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i thought new java 8 completablefuture able execute async tasks, 1 after without blocking threads, using "thencomposeasync" method.

i think not case. thread waits synchronously task completed (completablefuture.java:616 r = fr.waitingget(false);)

and following piece of code never executes "task 3" if nthreads <= 2:

int nthreads= 2; executor e= executors.newfixedthreadpool(nthreads);  completablefuture.runasync( () -> {     system.out.println("task 1 threadid " + thread.currentthread().getid()); }, e).thencomposeasync( (void v1) -> {     return completablefuture.runasync( () -> {         system.out.println("task 2 threadid " + thread.currentthread().getid());     }, e).thencomposeasync((void v2) -> {         return completablefuture.runasync( () -> {             system.out.println("task 3 threadid " + thread.currentthread().getid());         }, e);     }, e); }, e).join(); system.out.println("finished");

¿what other java library should use? want code execute in 1 thread (with nthreads = 1).

this 1 working. instead of completablefuture.thencomposeasync, call:

static public <t,u> completablefuture<u> thencomposeasyncnowait(completablefuture<t> first, function<? super t, ? extends completablefuture<u>> fn, executor executor) {     completablefuture<u> ret= new completablefuture<>();     first.handleasync( (t t, throwable e) -> {         if ( e != null )             ret.completeexceptionally(e);         else             fn.apply(t).handleasync( (u u, throwable e2) -> {                 if ( e2 != null )                     ret.completeexceptionally(e2);                 else                     ret.complete(u);                 return null;             }, executor);         return null;     }, executor);     return ret; }

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