Java语言lang.IllegalState异常：连接池在关闭

Question

当从S3下载文件时，它失败了，给了我这个异常

Java语言lang.IllegalState异常：连接池关闭

com.amazonaws.http.conn.Aandler.invoke（Aactory.java:76）
在com.amazonaws.http.conn.AbstractConnProxy70.request（AbstractConnPorg.apache.http.impl.execchain.）在xec.executePoolingHttpClientConnectionMxec.java:175连接（PoolingHttpClientConnectionManager.java:251）在sun.reflect.NativeMachodAccessorImpl.invoke0（本机方法）
org.apache.http.impl.client.NativeMachodAccessorIlient.do（NativeMEodAccessorImpl.java:62）在sun.reflect.在java.lang.reflect.Method.invoke（Method.java:498）在org.apache.http.util.ClientConnectionManagerFactory$Hsserts.check（ClientConnectionManagerFsserts.java:34）在org.apache.http.pool.$Pool.lease连接（未知来源）在ool.java:184MainClientEorg.apache.http.impl.conn.（MainClientEanager.request）在atsun.reflect.InternalHttpCmpl.invokeExecute（InternalHttpClient. java： 184）在org. apache. http. plp. client。CloseableHttpClient。在com. amazonaws. http。亚马逊HttpClient$Request ExecutionBuilderImpl。执行（亚马逊HttpClient. java： 649）在com. amazonaws. http。亚马逊HttpClient. java： 513）在com. amazonaws. services. s3。亚马逊3Client. invoke（亚马逊3Client. java： 4221）在com. amazonaws. services. s3。亚马逊3Client. invoke（亚马逊3Client. java： 4168）在com. amazonaws. services. s3。亚马逊3Client. getObjectMetadata（亚马逊3Client. java： 1249）在com. amazonaws. services. s3。转移管理器. do下载（转移管理器. java： 1053）在com. amazonaws. services. s3。转移管理器. do下载（转移管理器. java： 1007）在com. amazonawws

Answer 1

如果要共享连接，请不要在请求后关闭客户端。

也就是说，你可能正在做这样的事情：

PoolingHttpClientConnectionManager pool = new PoolingHttpClientConnectionManager();
...
CloseableHttpClient httpclient = HttpClients.custom()
     .setConnectionManager(pool)
     .build();

try { // try-with-resources
    HttpGet httpget = new HttpGet(url.toURI());
    try (CloseableHttpResponse response = httpclient.execute(httpget);
             InputStream fis = response.getEntity().getContent();
            ReadableByteChannel channel = Channels.newChannel(fis)) {
             // ... get data ...
     } finally {
         httpclient.close(); <====== !!
     }
} catch (IOException | URISyntaxException e) {
    // exception handling ...
}

httpclient.close（）导致下一个池连接失败。

^{取自：https://stackoverflow.com/a/59033548/1329340}