java.net.SocketException：没有可用的缓冲区空间（已达到最大连接数）：connect

问题描述

您好，我使用Apache HTTP客户端4.0上传一些基于HTTPS协议的服务器上的文件。上传的应用程序正在运行24x7。今天突然，它开始抛出这个异常 -

Hi I am using Apache HTTP Client 4.0 to upload some files on a server based on HTTPS protocol. The uploaded application is running 24x7. Today suddenly it started to throw this exception-

java.net.SocketException: No buffer space available (maximum connections reached?): connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(Unknown Source)
    at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(Unknown Source)
    at org.apache.http.conn.ssl.SSLSocketFactory.connectSocket(SSLSocketFactory.java:333)
    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:123)
    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:147)
    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:101)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:381)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:641)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:576)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:554)

任何人都可以帮助我吗？我完全不知道发生了什么。

Can anyone please help me? I am totally clueless on what is going on?

这是上传文件的源代码 -

This is the source code which upload the file -

public File call() throws Exception {
            HttpClient httpclient = new DefaultHttpClient();
        try{
            httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
            /*
             * Create POST REQUEST
             */
            HttpPost httpPost = new HttpPost(this.URL);
            /*
             * Create MultipartRequestEntity
             */
            MultipartEntity multipartEntity = new MultipartEntity( HttpMultipartMode.BROWSER_COMPATIBLE );
            /*
             * Add POST Parameters
             */
            multipartEntity.addPart(parameters[0], this.fileBody);
            multipartEntity.addPart(parameters[1], new StringBody(this.TYPE));
            multipartEntity.addPart(parameters[2], new StringBody(this.MAAID));
            /*
             * Add this POST Method
             */
            httpPost.setEntity(multipartEntity);
            /*
             * Upload the file
             */
            HttpResponse response = httpclient.execute(httpPost);
            int responseCode = response.getStatusLine().getStatusCode();
            logger.info("Response Code of HTTP Connectivity ["+ responseCode + "], " +
                                                            "it means ["+ response.getStatusLine().getReasonPhrase()+"]");
            /*
             * Check the server Response
             */
            HttpEntity entity = response.getEntity();
            if(entity != null){
                String status = EntityUtils.toString(entity);
                logger.info("Status of file upload from Server >>"+ status+"<<");
                entity.consumeContent();
                if(status.equalsIgnoreCase("OK")){
                    return this.fileBody.getFile();
                }
            }else{
                logger.error("Unable to retrieve status of file upload from server");
            }
        }catch(NoRouteToHostException e){
            logger.error("Internet connection to ["+ this.URL + "] is not available", e);
        }catch(SocketException e){
            logger.error("Unable to connect to "+ this.URL, e);
        }catch (Exception e) {
            logger.error("Exception while uploading the file["+ this.fileBody.getFilename()+ "] on ["+ this.URL+"]", e);
        }finally{
            try{
                httpclient.getConnectionManager().shutdown();
            }catch(Exception e){
                // Ignore this exception
            }
        }
        return null;
    }

推荐答案

并且问题不直接与您的代码，而是与您的服务器状态有关。

My guess: you are running out of ports and the issue isn't directly related to your code but to your server state. Too many connections are opened to other machines and this causes the issue.

查找内容：

• 您的服务器是否被大量使用，可能会导致多个网络连接被打开？


• 建议仅实例化一个 HttpClient 并重用此实例。它们是，其中实例化多个HTTP客户端，并且不正确地释放连接导致网络连接堆栈，从不关闭。尝试 httpPost.releaseConnection（）。您还可能对HTTP客户端文档感兴趣，

• Is your server under heavy usage that might cause multiple network connections to be opened?
• The HTTP client documentation recommends to instantiate only one HttpClient and to reuse this instance. They are cases where instantiating multiple HTTP clients and not releasing connections correctly causes network connections to stack and never be closed. Try to httpPost.releaseConnection(). You might also be interested in the HTTP client documentation, chapter 1.1.5, "Ensuring release of low level resources"

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