[jboss-user] empty servlet responses

[Stephen Davidson]

Hi Andreas.

This is just a WAG, but are you using InputStream to read your file?  And/or are
you aborting when 0-bytes read?  If so, I would change that to -1, as 0-bytes
can occur when the filesystem and/or JVM is busy.  I could be off base here, but
a 'while (bytesRead <= 0)' would cause the symptoms you are seeing.

-Steve
PS> Two items you can not turn off on your platform;
- GC
- Kernel level file access -- linux has a background file process running to
reorg files to keep them from becoming fragmented.


Andreas Tschritter wrote:
> Hi,
> 
> we are running an Axis 1.4 server app inside a JBoss 4.0.2 AS with
> basically everything disabled but the tomcat. It is quite simple, for
> every call it
> gets some XML from another app running on the same AS, adds the SOAP
> envelope and returns that.
> We test this app with a test client does very frequent requests.
> During the test runs from time to time we get an empty response from the
> server.
> When this happens, it often happens a small number of times during some
> seconds and then everything is ok again for one or more hours.
> On the server, with Axis logging set to debug and jboss/tomcat logging
> set to info, there are no errors and the requests during that time seem
> to work
> like all the others. Also, there is no garbage collection during that
> time. Only thing I've noticed is that the requests at that time take a
> bit longer.
> It also seems to happen less when logging is set to a low level and much
> logging output s produced.
> Only the Jboss + apps is running on that machine, nothing else, not even
> crons. Its a quad-core AMD64 with 8GB RAM running debian 4.0, the jboss
> VM has
> 5GB heap assigned.
> Does anybody have an idea what could cause this or what we could do to
> find / fix the issue?
> 
> thanks,
> 
> Andreas Tschritter
> 
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