调用CloseableHttpAsyncClient Close方法时发生死锁

Question

我遇到一个有线问题。 当我调用HttpAsyncClients.excute方法时，如果网络不稳定（无法连接到服务器），则会调用失败的方法。

然后它将调用被阻止的CloseableHttpAsyncClient.close方法。 这使程序出错。 CloseableHttpAsyncClient关闭时如何避免死锁？

下面是代码：

public static void sendPostAsync(String url, String param) {
    try {
        final CloseableHttpAsyncClient httpClient = HttpAsyncClients.createDefault();
        httpClient.start();
        final HttpPost request = new HttpPost(url);
        StringEntity se = new StringEntity(param, "UTF-8");
        request.setEntity(se);
        request.addHeader(new BasicHeader("Content-Type", "application/json"));

        httpClient.execute(request, new FutureCallback<HttpResponse>() {
            public void completed(final HttpResponse response) {
                try {
                    String requestContent = null;
                    try {
                        requestContent = EntityUtils.toString(request.getEntity());
                    } finally {
                        EntityUtils.consume(request.getEntity());
                    }

                    String content = null;
                    try {
                        content = EntityUtils.toString(response.getEntity());
                    } finally {
                        EntityUtils.consume(response.getEntity());
                    }



                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                    close(httpClient);
                }
            }


            public void failed(final Exception ex) {
                close(httpClient);
                System.out.println(request.getRequestLine() + "->" + ex);
                System.out.println(" callback thread id is : " + Thread.currentThread().getId());
            }


            public void cancelled() {
                close(httpClient);
                System.out.println(request.getRequestLine() + " cancelled");
                System.out.println(" callback thread id is : " + Thread.currentThread().getId());
            }


            private void close(CloseableHttpAsyncClient client) {
                try {
                    System.out.println("sendPostJsonAsync httpClient.close()");
                    client.close();//blocked here
                } catch (IOException ex) {

                }
            }

        });

    } catch (Exception e1) {
        logger.error("sendPostJson", e1);
        e1.printStackTrace();
    }
}

client.close的源代码如下：

    @Override
public void close() {
    if (this.status.compareAndSet(Status.ACTIVE, Status.STOPPED)) {
        if (this.reactorThread != null) {
            try {
                this.connmgr.shutdown();
            } catch (final IOException ex) {
                this.log.error("I/O error shutting down connection manager", ex);
            }
            try {
                this.reactorThread.join();
            } catch (final InterruptedException ex) {
                Thread.currentThread().interrupt();
            }
        }
    }
}