Question about System.in, FileoutputStream and blocking

Hello everybody,
I have written a simple java program that read the System.in and append it to file (which is the first argument of the program).
Here is the context: my client launch several instance of this program at the same time, with the same file passed in argument. In a first time, I did not use the FileChannel.lock() method because I didn't know there will be several instance, but this is not the question.
The problem is simple: sometime, I can't figure why (and this is why I'm here to ask you), one of the process block, and stay like this until my client kill it.
So why? It has something to do with the absence of FileChannel.lock()?
My client is on Solaris, don't know which version, with a JDK 1.5.0_04
Here is the code:
InputStream is = System.in;
InputStreamReader ir = new InputStreamReader(is, encodingMode);
BufferedReader reader = new BufferedReader(ir);
FileOutputStream fos = new FileOutputStream(args[0], true);
String lineSeparator = System.getProperty("line.separator");
String buf = null;
while ((buf = reader.readLine()) != null) {
fos.write(buf.concat(lineSeparator).getBytes(encodingMode));
}I think the FileChannel.lock on the output file will solve the problem, but I'm just curious about that odd issue.
Thanks for help, and excuse me for my bad english.

Ok, I try to launch 20 occurences at the same time on opensolaris 2009.06 and here is what I've got:
Error occurred during initialization of VM
Could not reserve enough space for object heap
# An unexpected error has been detected by Java Runtime Environment:
# java.lang.OutOfMemoryError: requested 32756 bytes for ChunkPool::allocate. Out of swap space?
# Internal Error (allocation.cpp:120), pid=1603, tid=2
# Error: ChunkPool::allocate
# Java VM: Java HotSpot(TM) Client VM (11.3-b02 mixed mode solaris-x86)
# An error report file with more information is saved as:
# /export/home/eric/SocGen/hs_err_pid1603.log
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
Error occurred during initialization of VM
java/lang/ClassNotFoundException: error in opening JAR file /usr/jdk/instances/jdk1.6.0/jre/lib/rt.jarI've also got a nice core file and a hs_err_pid1603.log ( here: http://pastebin.com/m513df649
Funny think is that I can't reproduce it on AIX.
Hope that can help you helping me.
Edited by: Eric-Fistons on 13 oct. 2009 13:43
Edited by: Eric-Fistons on 13 oct. 2009 13:45

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Question about System.in, FileoutputStream and blocking

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