Problem while assigning Servlet to Execute queue

Question

Hi,
We implement a IMS S-CSCF on BEA container 2.2.
A call for us may be several times reentrant. Meaning that for one call we have to handle at least three different dialogs but in major use cases, it will be 6 or 7 for our next deployment.
We are currently facing to bottlenecks problems and BEA support advised me to try to check if assigning servelt to execute queue could improve the preformances.
I just wanted to make a try with one of our servlet but I have an exception java.lang.NoClassDefFoundError: org/jaxen/JaxenException.
Here is what I did:
In web.xml I have:
<web-app>
<distributable/>
<servlet>
<servlet-name>register</servlet-name>
<servlet-class>com.netcentrex.scscf.registrar.RegistrarServlet</servlet-class>
<init-param>
<param-name>wl-dispatch-policy</param-name>
<param-value>REGISTRARQueue</param-value>
</init-param>
<load-on-startup/>
</servlet>
<listener>
<listener-class>com.bea.wcp.sip.engine.server.ContextEventHook</listener-class>
</listener>
</web-app>
In sip.xml I have:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sip-app
PUBLIC "-//Java Community Process//DTD SIP Application 1.0//EN"
"http://www.jcp.org/dtd/sip-app_1_0.dtd">
<sip-app>
<display-name>SIP Servlet based Registrar</display-name>
<distributable/>
<context-param>
<param-name>usc.configFile</param-name>
<param-value>/etc/neotip/usc.ini</param-value>
</context-param>
<context-param>
<param-name>icscf.configFile</param-name>
<param-value>/etc/neotip/icscf.ini</param-value>
</context-param>
<context-param>
<param-name>usc.dnsSrvFile</param-name>
<param-value>/etc/neotip/uscDnsSrv.cache</param-value>
</context-param>
<listener>
     <listener-class>com.netcentrex.scscf.session.SessionServlet</listener-class>
</listener>
<servlet>
<servlet-name>register</servlet-name>
<servlet-class>com.netcentrex.scscf.registrar.RegistrarServlet</servlet-class>
<load-on-startup/>
</servlet>
<servlet>
     <servlet-name>session</servlet-name>
     <servlet-class>com.netcentrex.scscf.session.SessionServlet</servlet-class>
     <load-on-startup/>
</servlet>
<servlet>
     <servlet-name>route</servlet-name>
     <servlet-class>com.netcentrex.scscf.fork.RouteServlet</servlet-class>
     <load-on-startup/>
</servlet>
<servlet>
     <servlet-name>icscf</servlet-name>
     <servlet-class>com.netcentrex.scscf.embeddedI.IEmbeddedServlet</servlet-class>
     <load-on-startup/>
</servlet>
<servlet-mapping>
<servlet-name>register</servlet-name>
<pattern>
<equal>
     <var>request.method</var>
     <value>REGISTER</value>
</equal>
</pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>session</servlet-name>
<pattern>
     <and>
          <not>
          <equal>
                    <var>request.method</var>
                    <value>REGISTER</value>
          </equal>
          </not>
          <not>
     <exists>
               <var>request.uri.param.uscroute</var>
          </exists>
          </not>
          <not>
     <exists>
               <var>request.uri.param.icscfroute</var>
          </exists>
          </not>
     </and>
</pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>route</servlet-name>
<pattern>
     <and>
          <not>
          <equal>
                    <var>request.method</var>
                    <value>REGISTER</value>
          </equal>
          </not>
          <exists>
          <var>request.uri.param.uscroute</var>
     </exists>
     </and>
</pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>icscf</servlet-name>
<pattern>
     <and>
          <not>
          <equal>
                    <var>request.method</var>
                    <value>REGISTER</value>
          </equal>
          </not>
          <exists>
     <var>request.uri.param.icscfroute</var>
     </exists>
     </and>
</pattern>
</servlet-mapping>
<session-config>
     <session-timeout>30</session-timeout>
</session-config>
</sip-app>
In msi-config.xml, we have:
<Server Cluster="BEA_ENGINE_TIER_CLUST" EnabledForDomainLog="false"
ListenAddress="192.168.150.26" ListenPort="8001" Name="engine1"
NativeIOEnabled="true" NetworkAccessPoints="sipchannel"
ServerVersion="8.1.5.0" StdoutDebugEnabled="true"
StdoutEnabled="true" StdoutSeverityLevel="64">
<NetworkAccessPoint ListenAddress="192.168.150.34"
ListenPort="5060" Name="sipchannel" Protocol="sip"
PublicAddress="192.168.150.34" SourcePorts="41000-42000"/>
<SSL Enabled="false" IdentityAndTrustLocations="KeyStores" Name="engine1"/>
<Log FileCount="10" FileMinSize="60000" Name="engine1" NumberOfFilesLimited="true"/>
<ExecuteQueue Name="sip.transport.Default" QueueLength="2048" ThreadCount="25"/>
<ExecuteQueue Name="REGISTRARQueue" QueueLength="2048" ThreadCount="25"/>
<ExecuteQueue Name="sip.transport.Default" QueueLength="2048" ThreadCount="25"/>
<ExecuteQueue Name="weblogic.kernel.Default"/>
<ExecuteQueue Name="sip.timer.Default" QueueLength="2048" ThreadCount="25"/>
<ExecuteQueue Name="sip.tracing.local" QueueLength="1024"
ThreadCount="1" ThreadsMaximum="1" ThreadsMinimum="1"/>
<ExecuteQueue Name="sip.tracing.domain" QueueLength="1024"
ThreadCount="1" ThreadsMaximum="1" ThreadsMinimum="1"/>
</Server>
Then when I launch a SIP REGISTRATION operation I get the following trace:
2007-05-30 17:37:03,649 ERROR RegistrarServlet [ExecuteThread: '23' for queue: 'sip.transport.Default'] : Error while processing request: REGISTER sip:netcentrexbench.net SIP/2.0
P-Charging-Vector: icid-value=AyretyU0dm+1970294253=0465138796
P-Access-Network-Info: ADSL;dsl-location="netcentrexbench.net;1.2.3.4"
CSeq: 2 REGISTER
Call-ID: [email protected]
Supported: path
Via: SIP/2.0/UDP 192.168.254.56:5063;branch=z9hG4bK-19606-1-2
From: dench0 <sip:[email protected]>;tag=1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
To: dench0 <sip:[email protected]>
Authorization: Digest username="dench0",realm="netcentrexbench.net",cnonce="6b8b4567",nc=00000001,qop=auth,uri="sip:192.168.150.34:5060",nonce="NQei3RIBAAA=le+kkCcrZcahXxQ7M6r7dw==",response="b824a93822b267ddfaa07f4039d99d95",algorithm=MD5
Content-Length: 0
Contact: sip:[email protected]:5063
User-Agent: LYNX_BENCH
Path: <sip:[email protected]:5063;lr>
Require: path
Expires: 36000
Max-Forwards: 70
java.lang.NoClassDefFoundError: org/jaxen/JaxenException
at org.dom4j.DocumentFactory.createXPath(DocumentFactory.java:230)
My first doubt is that I think I should get "ERROR RegistrarServlet [ExecuteThread: '23' for queue: 'REGISTRARQueue'] " instead of "ERROR RegistrarServlet [ExecuteThread: '23' for queue: 'sip.transport.Default'] "
First question: did I miss something or did something wrong in the configuration?
Second question: is it really possible to assign a single servlet (from an application containing many other servlets) to a dediacted execute queue?
Third question: any help is welcome :-)
Thanks in advance,
Lionel,

Answer 1

At teh end I found the basic :-) problem on my exception but anyway , the used execute queue for REGISTER is always sip.transport.default
Help on this point is welcome!
Thanks