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From Uwe.Hellm...@t-systems.com
Subject AW: Mysterious request edirect with value exchange
Date Tue, 20 Dec 2011 13:51:55 GMT
Thanks for the answer.
We have a test environment but there it isn't reproducible.
Just on the production system. But everything is configured identical.
We use Apache with mod_proxy (via AJP).

Only the connector? It is pretty standard.

<Server port="8005" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.core.AprLifecycleListener" />
  <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
  <Listener className="org.apache.catalina.storeconfig.StoreConfigLifecycleListener"/>

<GlobalNamingResources>
<Environment name="simpleValue" type="java.lang.Integer" value="30"/>
<Resource name="UserDatabase" auth="Container"
              type="org.apache.catalina.UserDatabase"
       description="User database that can be updated and saved"
           factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
          pathname="conf/tomcat-users.xml" />

  </GlobalNamingResources>
<Service name="Catalina">



<Connector port="8080" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true" />
<Engine name="Catalina" defaultHost="localhost" jvmRoute="jvmroute1">

<Host name="localhost" appBase="webapps"
       unpackWARs="true" autoDeploy="true"
       xmlValidation="false" xmlNamespaceAware="false">

<Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
                 managerClassName="org.apache.catalina.cluster.session.DeltaManager"
                 expireSessionsOnShutdown="false"
                 useDirtyFlag="true"
                 notifyListenersOnReplication="true">

            <Membership
                 className="org.apache.catalina.cluster.mcast.McastService"
                 mcastAddr="228.0.0.4"
                 mcastPort="45564"
                 mcastFrequency="500"
                 mcastDropTime="3000"/>

            <Receiver
                className="org.apache.catalina.cluster.tcp.ReplicationListener"
                tcpListenAddress="10.197.120.52"
                tcpListenPort="4002"
                tcpSelectorTimeout="100"
                tcpThreadCount="6"/>

            <Sender
                className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
                replicationMode="pooled"
                ackTimeout="15000"/>

            <Valve className="org.apache.catalina.cluster.tcp.ReplicationValve"
                filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.css;.*\.txt;"/>

            <Deployer className="org.apache.catalina.cluster.deploy.FarmWarDeployer"
                tempDir="/tmp/war-temp/"
                deployDir="/tmp/war-deploy/"
                watchDir="/tmp/war-listen/"
                watchEnabled="false"/>

            <ClusterListener
                className="org.apache.catalina.cluster.session.ClusterSessionListener"/>

        </Cluster>

</Host>

    </Engine>

  </Service>

</Server>

The Apache Tomcat Native library is not installed.

Thanks 
Uwe



-----Urspr√ľngliche Nachricht-----
Von: Christopher Schultz [mailto:chris@christopherschultz.net] 
Gesendet: Freitag, 25. November 2011 15:33
An: Tomcat Users List
Betreff: Re: Mysterious request edirect with value exchange

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Hash: SHA1

Uwe,

On 11/25/11 7:43 AM, Uwe.Hellmann@t-systems.com wrote:
> We have a Loadbalancer which roundrobin addresses 2 Apache 2.2.
> which passes their requests via mod_proxy balancer to 2 tomcat
> 5.5.26 servers which are configured identical and have also
> clustering enabled. The application is located only on the
> tomcats.

Are you using HTTP or AJP? From your description, it's probably HTTP
but it's worth asking.

Are you able to test/reproduce without the lb or a second Tomcat in
the mix? I'm sure this is a rare occurrence, so reproducing might not
be easy. If you have a test bed environment that is identical to
production (you do have one, right?), can you load it down and observe
intermittent failures like this? If so, try hitting a single Tomcat
directly and see if the problem disappears.

> So what we have is a redirected response from a failed login
> process. As example we have an login mask and while tryinig to
> login we put the username "Tester" in the username inputfield send
> the form away and get a login error message and the following URL
> string: http://mytestsystem/login.action?login_error=1&u=Tester In
> the input field the value Tester is still set.
> 
> This result is as expected, but from time to time we saw the
> following URL string returned 
> http://mytestsystem/login.action?login_error=1&u=OtherUser although
> we sent the form with Tester as value away. But now in the input
> field it is also OtherUser set.

Have you reviewed the code in your test? Sometimes the tests are
flawed. :(

> We have checked Loadbalancer rewrites(possible Proxywrites) and
> fount nothing. The behaviour seem to appear if we have much load on
> these systems. Does anybody have any idea where I should start my
> investigation. I would assume the application does have a problem
> with session handling or a corruptable redirection method but the
> developer told us everything is fine.

Of course the developer told you that the software is bulletproof. :)

Can you post your <Connector> elements from your server.xml (minus
anything that might be considered sensitive, of course), and let us
know if you are using APR (aka "native") with Tomcat.

- -chris
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