Re: Socket error Windows getInputStream

From:
Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups:
comp.lang.java.programmer
Date:
Tue, 18 Mar 2008 15:25:32 -0700
Message-ID:
<47e0415b$0$6981$b9f67a60@news.newsdemon.com>
vicky7909@rediffmail.com wrote:

Hello,

Java version is 1.5.0_09. I am trying to connect from a Windows
machine to another Windows machine using sockets . Getting a socket
error for the following line. and throws EOFException

Socket s = null;
ObjectInputStream sin = null;
ObjectOutputStream sout = null;

s = new Socket( host, port );
sout = new ObjectOutputStream( s.getOutputStream() );

//write data to socket
sout.writeObject( req );
sout.flush();

InputStream is = s.getInputStream() );
sin = new ObjectInputStream( is ); // This line gives error

If I step into ObjectInputStream, I see:

public ObjectInputStream(InputStream in) throws IOException {
    verifySubclass();
    bin = new BlockDataInputStream(in);
    handles = new HandleTable(10);
    vlist = new ValidationList();
    enableOverride = false;
    readStreamHeader(); // This line gives error
    bin.setBlockDataMode(true);
 }

However, the same code works when I try to connect from Linux(Red Hat
Enterprise Linux WS release 4 (Nahant Update 5)) to Windows. Turned
off Windows firewall but no luck.

On the Windows Server I am trying to connect to a server agent waiting
on port 2002 that helps me connect to Citrix running on that machine.
The agent runs as a Windows service.

What could be wrong here?

Stack Trace

java.io.EOFException
    at java.io.ObjectInputStream
$PeekInputStream.readFully(ObjectInputStream.java:2228)
    at java.io.ObjectInputStream
$BlockDataInputStream.readShort(ObjectInputStream.java:2694)
    at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:
761)
    at java.io.ObjectInputStream.<init>(ObjectInputStream.java:277)
...
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:
202)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:
173)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:
213)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:
178)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:
126)
    at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:
105)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:
107)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:
148)
    at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:
869)
    at org.apache.coyote.http11.Http11BaseProtocol
$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:
664)
    at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:
527)
    at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:
80)
    at org.apache.tomcat.util.threads.ThreadPool
$ControlRunnable.run(ThreadPool.java:684)
    at java.lang.Thread.run(Thread.java:595)

I'm not sure what your problem is. I've done this quite a few times
between Windows machines with no problem. If the communications is
two-way it is usually necessary to create the ObjectOutputStream before
the ObjectInputStream. That can cause some problems but it is usually
hangs and not EOFExceptions.

Probably the simplest thing you can do here is write a couple of test
programs and see if you can see where the problem is actually happening.
   Sometimes removing all the other code gets you to the problem in the
original code.

--

Knute Johnson
email s/nospam/linux/

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