javasocketsconnectionhttpclientsocketexception

java.net.SocketException: No buffer space available (maximum connections reached?): connect


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)

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

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;
    }

Solution

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

    What to look for: