Question

我正在为apache-httpclient的httpclient编写测试样本来测试多线程请求错误。

我在for循环中运行它并在每个循环中创建2个线程以运行具有2个不同主机的测试用例设置为池化管理器。

在10个循环中，我总是遇到1个错误：线程中的异常＆＃34;线程-2＆＃34; java.lang.IllegalStateException：条目[id：17] [route：{} - ＆gt; http：// ***：8000] [state：null]尚未从此池中租借在org.apache.http.util.Asserts.check（Asserts.java:46）

我的代码有问题吗？我该怎么办？

样本如下：

private void testHttpClient() {

        HttpHost proxy = new HttpHost("dev.host.com", 8001);
        final DefaultProxyRoutePlanner routePlanner = new DefaultProxyRoutePlanner(proxy);

        final PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
        cm.setMaxTotal(20);
        cm.setDefaultMaxPerRoute(1);
        HttpHost localhost1 = new HttpHost("dev.test1.com", 8001);
        cm.setMaxPerRoute(new HttpRoute(localhost1), 2);
        HttpHost localhost2 = new HttpHost("dev.test2.com", 8000);
        cm.setMaxPerRoute(new HttpRoute(localhost2), 2);

        RequestConfig requestConfig = RequestConfig.custom()
            .setConnectTimeout(1000)
            .setSocketTimeout(1000)
            .setConnectionRequestTimeout(1000)
            .build();
        final CloseableHttpClient httpclient1 = HttpClients.custom()
            .setConnectionManager(cm)
            .setRoutePlanner(routePlanner)
            .setDefaultRequestConfig(requestConfig)
            .build();

        RequestConfig requestConfig2 = RequestConfig.custom()
            .setConnectTimeout(1000)
            .setSocketTimeout(1000)
            .setConnectionRequestTimeout(1000)
            .build();
        final CloseableHttpClient httpclient2 = HttpClients.custom()
            .setConnectionManager(cm)
            .setRoutePlanner(routePlanner)
            .setDefaultRequestConfig(requestConfig2)
            .build();

        class HttpClientThead1 implements Runnable {
          public void run() {
            for (int i = 1; i <= 1; i++) {
              System.out.println("HttpClientThead1 Start");
              HttpClientContext context = HttpClientContext.create();
              try {
                HttpGet httpget = new HttpGet("http://dev.test1.com:8001/test/id/10001");
                CloseableHttpResponse response = httpclient1.execute(httpget, context);
                long t = System.currentTimeMillis();
                System.out.println("HttpClientThead1 " + i + ":" + response.getEntity().toString() + " " + t);
                response.close();
              } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
              } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
              } finally {
                cm.closeExpiredConnections();
                cm.closeIdleConnections(30, TimeUnit.SECONDS);
              }
            }
          }
        }

    class HttpClientThead2 implements Runnable {
      public void run() {
        for (int i = 1; i <= 1; i++) {
          System.out.println("HttpClientThead2 Start");
          HttpClientContext context = HttpClientContext.create();
          try {
            HttpGet httpget2 = new HttpGet("http://dev.test2.com:8000/test/id/10002");
            CloseableHttpResponse response2 = httpclient2.execute(httpget2, context);
            long t = System.currentTimeMillis();
            System.out.println("HttpClientThead2 " + i + ":" + response2.getEntity().toString() + " " + t);
            response2.close();
          } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          } finally {
            cm.closeExpiredConnections();
            cm.closeIdleConnections(30, TimeUnit.SECONDS);
          }
        }
      }
    }

    for (int j = 1; j <= 10; j++) {
      HttpClientThead1 t1 = new HttpClientThead1();
      HttpClientThead2 t2 = new HttpClientThead2();

      Thread thread1 = new Thread(t1);
      Thread thread2 = new Thread(t2);
      thread1.start();
      thread2.start();
    }
}

Answer 1

我得到了答案，因为我在这个httpclient中设置了一个代理。所以我还需要用代理信息将它设置为setMaxPerRoute。

所以它应该是： cm.setMaxPerRoute（new HttpRoute（localhost2，proxy），10）;

Answer 2

我相信您在HttpClient中发现了一个错误；我在这里报告了该问题：https://issues.apache.org/jira/browse/HTTPCORE-634。仅在使用连接池但不重用连接时会发生这种情况。

仅当整个响应都用完后，才能重新使用Http连接。我将您的代码更改如下：

(...)
            CloseableHttpResponse response2 = httpclient2.execute(httpget2, context);
            HttpEntity entity = response.getEntity();
            // consume the response
            EntityUtils.consumeQuietly(entity);
            response2.close();
(...)

，此后没有失败。因此，要么使用响应，要么不使用连接池，就可以了。

HttpClient 4.5.x多线程请求错误：尚未从此池中租用

2 个答案: