Java.net.SocketException:No buffer space available (maximum connections reached?): Connect__.net

When you recently used httpclient in your project, you encountered this problem with the following exception information:

Info: Retrying Connect
2013-1-23 16:36:31 Org.apache.http.impl.client.DefaultRequestDirector Tryconnect
Info: I/O exception (java.net.SocketException) caught when connecting to the target Host:no buffer space available (maximum Connections reached?): Connect
2013-1-23 16:36:31 Org.apache.http.impl.client.DefaultRequestDirector Tryconnect
Info: Retrying Connect
Java.net.SocketException:No buffer space available (maximum connections reached?): Connect
At Java.net.PlainSocketImpl.socketConnect (Native method)
At Java.net.PlainSocketImpl.doConnect (plainsocketimpl.java:351)
At Java.net.PlainSocketImpl.connectToAddress (plainsocketimpl.java:213)
At Java.net.PlainSocketImpl.connect (plainsocketimpl.java:200)
At Java.net.SocksSocketImpl.connect (sockssocketimpl.java:366)
At Java.net.Socket.connect (socket.java:529)
At Org.apache.http.conn.scheme.PlainSocketFactory.connectSocket (plainsocketfactory.java:127)
At Org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection ( defaultclientconnectionoperator.java:180)
At Org.apache.http.impl.conn.ManagedClientConnectionImpl.open (managedclientconnectionimpl.java:294)
At Org.apache.http.impl.client.DefaultRequestDirector.tryConnect (defaultrequestdirector.java:645)
At Org.apache.http.impl.client.DefaultRequestDirector.execute (defaultrequestdirector.java:480)
At Org.apache.http.impl.client.AbstractHttpClient.execute (abstracthttpclient.java:906)
At Org.apache.http.impl.client.AbstractHttpClient.execute (abstracthttpclient.java:805)
At Org.apache.http.impl.client.AbstractHttpClient.execute (abstracthttpclient.java:784)
At Com.yulore.json.MysqlService.parseJsonShop (mysqlservice.java:118)
At COM.YULORE.JSON.MYSQLSERVICE.WRITETOMYSQL (mysqlservice.java:68)
At Com.yulore.json.MysqlMainTest.main (mysqlmaintest.java:13)
Com.mysql.jdbc.CommunicationsException:Communications link failure due to underlying exception:


* * BEGIN NESTED EXCEPTION * *


Java.net.SocketException
Message:no buffer space available (maximum connections reached?): Connect


StackTrace:


Java.net.SocketException:No buffer space available (maximum connections reached?): Connect
At Java.net.PlainSocketImpl.socketConnect (Native method)
At Java.net.PlainSocketImpl.doConnect (plainsocketimpl.java:351)
At Java.net.PlainSocketImpl.connectToAddress (plainsocketimpl.java:213)
At Java.net.PlainSocketImpl.connect (plainsocketimpl.java:200)
At Java.net.SocksSocketImpl.connect (sockssocketimpl.java:366)
At Java.net.Socket.connect (socket.java:529)
At Java.net.Socket.connect (socket.java:478)
At Java.net.socket.<init> (socket.java:375)
At Java.net.socket.<init> (socket.java:218)
At Com.mysql.jdbc.StandardSocketFactory.connect (standardsocketfactory.java:256)
At Com.mysql.jdbc.mysqlio.<init> (mysqlio.java:271)
At Com.mysql.jdbc.Connection.createNewIO (connection.java:2771)
At Com.mysql.jdbc.connection.<init> (connection.java:1555)
At Com.mysql.jdbc.NonRegisteringDriver.connect (nonregisteringdriver.java:285)
At Java.sql.DriverManager.getConnection (drivermanager.java:582)
At Java.sql.DriverManager.getConnection (drivermanager.java:185)
At Com.yulore.json.db.DBManager.getConnectionWithJDBC (dbmanager.java:39)
At Com.yulore.json.db.impl.GlossaryDaoImpl.insert (glossarydaoimpl.java:20)
At COM.YULORE.JSON.MYSQLSERVICE.WRITETOMYSQL (mysqlservice.java:89)
At Com.yulore.json.MysqlMainTest.main (mysqlmaintest.java:13)




* * End NESTED EXCEPTION * *

Finally, Google and Baidu found that they created the httpget to send a GET request, and finally did not release the connection, the corrected code as follows

Private list<shop> parsejsonshop (String url) {
		httpclient httpclient = new Defaulthttpclient ();
		HttpGet httpget = new HttpGet (URL);
		HttpResponse response;
		try {
			response = Httpclient.execute (httpget);
			httpentity entity = response.getentity ();

			if (entity!= null) {

				InputStream in = Entity.getcontent ();

				String result = convertstreamtostring (in);
				In.close ();

				Jsonobject obj = new Jsonobject (result);

				Jsonobject resp = obj.getjsonobject ("response");
				Numfound = Resp.getlong ("Numfound");
				System.out.println ("numfound=" +numfound);

				Jsonarray docs = Resp.getjsonarray ("docs");
				String docs = resp.getstring ("docs");
				System.out.println ("docs=" +docs);

				list<shop> shoplist = Json.parsearray (docs, shop.class);
				Return shoplist
			}
		} catch (Exception e) {
			e.printstacktrace ();
		} finally {
			httpget.releaseconnection ();//Free Connection
		} return
		null;
	}

When you finish using HttpGet, remember to release the connection, or it will continue to occupy resources. In order to ensure that the connection will be released it is recommended to put it in the finally phrase.

One answer to the Sun's Technical forum is this:
Chances are you are forgetting to close a socket, a database connection, or some other connection this uses sockets Ally. Example program below.
The alternative is this your program (or the sum of all programs running on your computer) really needs a lot of connectio Ns. In this case you'll need to the increase the amount of socket buffer spaces that your operating system allocate S. I ' d start by Googling for instructions. Or Maybe you could redesign your program so, that it doesn ' t is very much.


For more answers to this question, see here:
http://forum.java.sun.com/thread.jspa?threadID=556382