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Too many open files

I got exceptions like:
java.net.SocketException: Too many open files
java.net.PlainSocketImpl.socketAccept(Native Method)
java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)
java.net.ServerSocket.implAccept(ServerSocket.java:450)
java.net.ServerSocket.accept(ServerSocket.java:421)

or

java.io.IOException: java.io.IOException: Too many open files
java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
java.lang.ProcessImpl.start(ProcessImpl.java:65)
java.lang.ProcessBuilder.start(ProcessBuilder.java:451)
java.lang.Runtime.exec(Runtime.java:591)
java.lang.Runtime.exec(Runtime.java:429)
java.lang.Runtime.exec(Runtime.java:326)

or

java.io.IOException: Too many open files
sun.nio.ch.IOUtil.initPipe(Native Method)
sun.nio.ch.PollSelectorImpl.<init>(PollSelectorImpl.java:40)
sun.nio.ch.PollSelectorProvider.openSelector(PollSelectorProvider.java:18)
java.nio.channels.Selector.open(Selector.java:209)

after those, which happened in different threads my application got stuck. What is this? Some kind of unix/linux problems or java? What can be done?

hoomanv

This seems to be because you open FileInputStreams, but don't close them!
You should explicitly close them

Buffon

ASKER

all the filestreams are closed explicitly in the end of each thread. I think its because I have many open sockets and files concurrently may be? What is the limit?

ASKER CERTIFIED SOLUTION

hoomanv

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Buffon

ASKER

ok, it seems as right direction. I will check it ASAP and will be back to you. 10x.

Buffon

ASKER

sorry I was away for a long time :( currently I am trying to install lsof utility:
https://www.experts-exchange.com/questions/22045878/lsof.html