Can i use Future.get() in Fiber task?

[LingXi1420]

I need to call a method in another lib, but the method have Future and ReentrantLock, like this :

 public CompletableFuture<EslMessage> sendApiSingleLineCommand(Channel channel, final String command) {     

 final CompletableFuture<Message> future = new CompletableFuture<>();       

      try {
        syncLock.lock(); //  ReentrantLock syncLock = new ReentrantLock();
        apiCalls.add(future);
        channel.writeAndFlush(command);
    } finally {
        syncLock.unlock();
    }
return future;
  }

then I called getUnchecked(sendApiSingleLineCommandchannel, sendMsg.getMsgLines())) to get the Future.get()

sometimes it runs ok, but sometimes it keeps warning and blocked Fiber, errors info: WARNING: fiber Fiber@10000650:HangUpCallEvent[task: ParkableForkJoinTask@17a4ac30(Fiber@10000650), target: co.paralleluniverse.strands.SuspendableUtils$VoidSusp endableCallable@559545a3, scheduler: co.paralleluniverse.fibers.FiberForkJoinScheduler@6762b60d] is blocking a thread (Thread[ForkJoinPool-default-fiber-pool-wo rker-7,5,main]). at sun.misc.Unsafe.park(Native Method) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1693) at java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3323) at java.util.concurrent.CompletableFuture.waitingGet(CompletableFuture.java:1729) at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895) at com.google.common.util.concurrent.Uninterruptibles.getUninterruptibly(Uninterruptibles.java:237) at com.google.common.util.concurrent.Futures.getUnchecked(Futures.java:1326)

Guys, give me a hand....