Redirection problem

Discussion in 'Java' started by Oleg Konovalov, Jan 30, 2006.

  1. Hi,

    We have a powerful Solaris server which hosts 2 sets of
    Apache 2.0.48 -> JBoss 3.07 with Tomcat 4.1.18
    using mod_jk2 2.0.2, running a bunch of web applications.
    They are configured to run independently (2 server names, 2 virtual servers,
    different ports, etc.)
    Used to run without a single glitch for about 1/2 year.

    We had a power failure a month ago, so the server crashed.
    After that we rebooted it, it automatically started Apache,
    we manually started JBoss (nobody touched any config files.).
    One set was totally restored (no problems whatsoever),
    but another one has a problem:
    - if you try to run any of the applications, getting error 404
    "requested resource not available".
    There is nothing showing in error_log, but in access_log:
    GET /myapp HTTP/1.1" 404 698
    - if I try to go to the main page: ,
    getting index.jsp (Tomcat's main page with the cat);
    - but if I try to use port 8080 ( ),
    getting main page and all the apps just fine.
    Even killed the second instance of java process for JBoss/Tomcat -
    same exact picture on server1
    (ghost tomcat? - no tomcat proccesses running)

    I interpreted it as a failure of something in the Apache->Tomcat/JBoss
    So I tried to do the following:
    - reboot server - same problem;
    - reinstalled Apache, copied all config files and modules (imcl. ) from old
    instance of Apache to a new one - same;
    - after that restarted JBoss - same.
    - reinstalled JBoss, restarted it and Apache - the same.

    More Experiments:
    1) If I change in URI line
    from to localhost/* or
    and then try to do:,
    it no longer shows the admin page of Tomcat,
    but shows page with something like
    "Seeing this instead of the website you expected?..." (Apache Test page).
    Is that a step in the right or wrong direction?

    We had problem on that server resolving localhost (maybe because we have 2
    instances of apache & jboss there, 2 servernames, etc.),
    so I changed localhost->server1 in all 3 config files:, and on JBoss - in server.xml and tomcat41-service.xml,
    still the same exact behavior.

    2) We replaced all "localhost" with the IP address of that virtual server
    (it has 2 network cards, 2 IP addresses, etc.) - same result

    3) We copied the working version of JBoss and modified its configuration
    (port numbers/IPs/servernames) to be as it was on that instance originally -
    same result.

    It might be worth mentioning that when I restart apache,
    see in error_log:
    error mod_jk child init 1 -2
    error jk2_init() can't find child 5194 in scoreboard
    What does that mean ?

    Trying to fix it for over a month and still can't find what might be wrong.

    1) what might have gone wrong in Apache/Tomcat/JBoss configuration or maybe
    Unix environment
    which prevents from Apache->Tomcat (part of JBoss) redirection (especially
    in 2 sets on 1 unix server) ?
    Can it be a network card failure after power outage?

    2) is it worth trying to move from mod_jk2 (no more support but works on 2
    of my servers out of 3)
    to mod_jk1.2 or mod_proxy ? Is it worth trying, what's involved? (might
    be very difficult, since I can only have
    that development/testing server available)

    3) On a bit unrelated topic:
    It seems that all our other servers works fine, however I have noticed tons
    of errors in
    Apache error_log, they all follow the following pattern:
    [error] channelSocket.receive(): Error receiving message body -1 131
    [error] workerEnv.processCallbacks() Error reading reply
    [error] ajp13.service() ajpGetReply recoverable error 120000

    Can you please tell if they are harmful, the cause and possible fix.
    (They seem to be produced at every request).

    Any help is VERY appreciated.

    Thank you in advance,
    Oleg Konovalov, Jan 30, 2006
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