After studying the knock-knock example, I've finally managed to make
something on my own with Jonathan on a protocol level (wheeee!). However, I
have encountered a recurring problem that I find rather strange, and I
wonder if anyone has an explanation.
Using the TcpIpProtocol, I make a Session and happily send and receive
messages using the CDRMarshallerFactory to make my messages. The
communication structure is very simple, with a server running a
TcpIpProtocol object with an exported Session_Low that prints out any
Strings received from the client, given that the message has the correct
header. The client also has a running TcpIpProtocol, and makes new
Marshallers containing java Strings and sends them over the network.
As long as the client makes new Marshallers and sends them off, everything
works fine. The moment my client stop doing this though, something in the
TcpIpProtocol sends another message. As this message is badly formatted
(eg. does not have my header) and in fact empty, my Session_Low on the
receiving side throws an Exception. The stacktrace goes as follows:
java.net.SocketException: Connection reset by peer
at java.net.SocketInputStream.read(SocketInputStream.java:84)
at
org.objectweb.jonathan.libs.resources.tcpip.IPv4ConnectionFactory$Connection
.receive(Compiled Code)
at
org.objectweb.jonathan.libs.protocols.tcpip.TcpIpChunkProvider.prepare(TcpIp
Protocol.java:707)
at
org.objectweb.david.libs.presentation.portable.CDRMarshallerFactory$CDRUnMar
shallerD.prepare(Compiled Code)
at
org.objectweb.david.libs.presentation.portable.PortableMarshallerFactory$Por
tableUnMarshaller.readByte(PortableMarshallerF
at SplitProtocol$TcpIpSessionLow.send(SplitProtocol.java:166)
at
org.objectweb.jonathan.libs.protocols.tcpip.TcpIpProtocol$Session.run(TcpIpP
rotocol.java:403)
at
org.objectweb.jonathan.libs.resources.JScheduler$JJob.run(Compiled Code)
I interpret this to mean that the server thinks another message is on it's
way, even though it's not. The server attempts to read from this message
(with the readByte method in PortableUnMarshaller) with the appropriate
Session_Low, and ends up raising an exception in the object that
encapsulates the Socket that's actually handling the data-transmission.
My question is why does the server attempt to read this last (and in in my
view) non-existing message? I have tried closing my sessions after sending
the last message, but I still end up getting the same exception. A solution
to this is of course to catch the Exception and ignore it, but I don't
really like the thought of having to perform a hack like that on such a low
level. I'm also unsure wether the Session can be reused after the
Exception, as the Socket tells me it has been reset by peer.
I do not encounter the same problem when I'm using MulticastIpProtocol. It
sends and receives with a merry grin and knows just when to read and when
not to :o)
If more information is needed, I can post the code that provokes the error.
I use Jonathan 2.0.1 and jdk1.1.8.
Best regards,
Per Christian Nodtvedt
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