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https://issues.apache.org/jira/browse/DERBY-3108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532707
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Bryan Pendleton commented on DERBY-3108:
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I think this is just the way TCP/IP works. You can only create TCP/IP
connections at a certain rate, due to the mechanics of TIME_WAIT
connection reclamation. Depending on your operating system,
and certain parameters, the number of connections you can create
per second will vary, but for all TCP/IP stacks and all machines there
is some maximum rate at which you can create and reclaim connections.
> Iteratively creating and closing client connection yields
> java.net.BindException: Address already in use: connect after many connections
> ----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-3108
> URL: https://issues.apache.org/jira/browse/DERBY-3108
> Project: Derby
> Issue Type: Bug
> Components: Network Client, Network Server
> Affects Versions: 10.4.0.0
> Reporter: Kathey Marsden
> Attachments: ConnLoop.java
>
>
> The attached program ConnLoop just creates client connections, uses them and
> then closes them. After about 3000 connections I get the following error.
> Also the memory usage seems to be increasing rapidly. This may be the cause
> of DERBY-2344.
> [C:/kmarsden/repro/DERBY-2344] java ConnLoop
> Apache Derby Network Server - 10.4.0.0 alpha - (578868M) started and ready to
> accept connections on port 1527 at 2007-10
> -05 15:56:57.500 GMT
> 0:total memory: 5435392 free: 2749776 Fri Oct 05 08:57:09 PDT 2007
> 1000:total memory: 13701120 free: 10586720 Fri Oct 05 08:57:40 PDT 2007
> 2000:total memory: 20738048 free: 12805336 Fri Oct 05 08:58:09 PDT 2007
> 3000:total memory: 24006656 free: 11053832 Fri Oct 05 08:58:40 PDT 2007
> Exception in thread "main" java.sql.SQLNonTransientConnectionException:
> java.net.BindException : Error connecting to ser
> ver localhost on port 1527 with message Address already in use: connect.
> at
> org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:70)
> at
> org.apache.derby.client.am.SqlException.getSQLException(SqlException.java:362)
> at org.apache.derby.jdbc.ClientDriver.connect(ClientDriver.java:149)
> at java.sql.DriverManager.getConnection(DriverManager.java:582)
> at java.sql.DriverManager.getConnection(DriverManager.java:207)
> at ConnLoop.main(ConnLoop.java:18)
> Caused by: org.apache.derby.client.am.DisconnectException:
> java.net.BindException : Error connecting to server localhost
> on port 1527 with message Address already in use: connect.
> at org.apache.derby.client.net.NetAgent.<init>(NetAgent.java:129)
> at
> org.apache.derby.client.net.NetConnection.newAgent_(NetConnection.java:1086)
> at org.apache.derby.client.am.Connection.<init>(Connection.java:349)
> at
> org.apache.derby.client.net.NetConnection.<init>(NetConnection.java:209)
> at
> org.apache.derby.client.net.NetConnection40.<init>(NetConnection40.java:77)
> at
> org.apache.derby.client.net.ClientJDBCObjectFactoryImpl40.newNetConnection(ClientJDBCObjectFactoryImpl40.java
> :209)
> at org.apache.derby.jdbc.ClientDriver.connect(ClientDriver.java:140)
> ... 3 more
> Caused by: java.net.BindException: Address already in use: connect
> at java.net.PlainSocketImpl.socketConnect(Native Method)
> at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
> at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
> at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
> at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
> at java.net.Socket.connect(Socket.java:519)
> at java.net.Socket.connect(Socket.java:469)
> at java.net.Socket.<init>(Socket.java:366)
> at java.net.Socket.<init>(Socket.java:179)
> at javax.net.DefaultSocketFactory.createSocket(SocketFactory.java:196)
> at
> org.apache.derby.client.net.OpenSocketAction.run(OpenSocketAction.java:62)
> at java.security.AccessController.doPrivileged(Native Method)
> at org.apache.derby.client.net.NetAgent.<init>(NetAgent.java:127)
> ... 9 more
> [C:/kmarsden/repro/DERBY-2344]
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