[jboss-user] empty servlet responses

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