Hi All,
This problem has intrigued me for quite some time now.
I cannot reproduce it on any other platform other than
RedHat Linux 6.x .
I am working on a Java POP Server.
I have a master thread, listening on a socket and
waiting for connection requests. It spawns a thread on
receiving a request. The thread implements a session, it
waits on the socket for input from the client. When
the client sends a command It responds appropriately.
I noticed that, if one session is active, and
If I open another session with the Server, a SocketException
is thrown in the existing session.
Reproduced below is the relevant stack trace:
java.net.SocketException: Interrupted system call
at java.net.SocketInputStream.socketRead(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:90)
at java.net.SocketInputStream.read(SocketInputStream.java:71)
at java.io.InputStreamReader.fill(InputStreamReader.java:163)
at java.io.InputStreamReader.read(InputStreamReader.java:239)
at java.io.BufferedReader.fill(BufferedReader.java:137)
at java.io.BufferedReader.read(BufferedReader.java:154)
I am not using the -green option.
I am performing clientSocket=serverSocket.accept() in the
main thread & then passing clientSocket to the child.
The behaviour of the problem is even more peculiar. It only
happens once, when the first thread is spawned and waiting
on clientInputStream.readLine() method for input and the
master thread is waiting on serverSocket.accept() method.
When this situation is true - and as soon as a request is
received by the master thread, the existing session suffers
a SocketException.
Once this is over, it never happens again, I can continue
opening new sessions with the PopServer.
Any words of advice ? Does someone have a solution ?
I could handle the exception and go back to attempt to
reading from the clients Input stream, but when a
SocketException is thrown due to unpredicted behaviour
from the clients side or due to some TCP error I will
then go into a hard loop. So thats not what I want.
Regards,
Santosh Dawara.
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