I'm new to this list and wondered if anyone can help. I've been using the
commons net package 1.1.0. I have an ftp client program that uses this
package and is continuously active. It has 5 or 6 different threads each of
which queries different directories on an FTP server. Each thread has a
separate FtpClient instance. A thread wakes up after 5 minutes, gets a new
FtpClient connection and attempts to copy any new files it finds posted in
its directory. It then disconnects (within a finally statement)
irrespective of whether it got errors.
What I find is that after some time of running (sometimes 2-3 days,
sometimes 2-3 weeks) I can no longer get a connection. I see:
java.net.SocketException: No buffer space available (maximum connections
reached?): JVM_Bind
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:331)
at java.net.Socket.bind(Socket.java:498)
at java.net.Socket.<init>(Socket.java:307)
at java.net.Socket.<init>(Socket.java:124)
at
org.apache.commons.net.DefaultSocketFactory.createSocket(DefaultSocketFactor
y.java:92)
at
org.apache.commons.net.SocketClient.connect(SocketClient.java:201)
at
org.apache.commons.net.SocketClient.connect(SocketClient.java:289)
at com.sis.ftpdupit.FtpWorker.syncFiles(Unknown Source)
at com.sis.ftpdupit.FtpWorker.run(Unknown Source)
I cannot see from my code how it would ever fail to call
FtpClient.disconnect(). Can anyone help? (Incidentally, from today I am
investigating the current 1.2.2 release in the hope that such a problem
might have been corrected there). Thanks in advance,
John Watson
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