[Building Sakai] Problem with login under load testing

[Gerwood Stewart]

We had one of our two load balanced servers fall over with thousands of the following error. Is any one familiar with what causes (or may cause) this?

Thanks
Gerwood

user: null (null)
email: null
usage-session: null
stack-trace-digest: 2A547F98C8E6A979A6708BE07845D3B02BBF6472
sakai-version: 2.5.4
service-version: 2009
app-server: latte.une.edu.au
request-path: /portal/xlogin
time: Jul 22, 2009 13:22:00


stack trace:

org.sakaiproject.portal.api.PortalHandlerException: java.lang.NullPointerException at
org.sakaiproject.portal.charon.handlers.XLoginHandler.doPost(XLoginHandler.java:48)
caused by: java.lang.NullPointerException
    at
org.sakaiproject.portal.charon.SkinnableCharonPortal.doLogin(SkinnableCharonPortal.java:981)
    at
org.sakaiproject.portal.charon.handlers.XLoginHandler.doGet(XLoginHandler.java:59)
    at
org.sakaiproject.portal.charon.handlers.XLoginHandler.doPost(XLoginHandler.java:48)
    at
org.sakaiproject.portal.charon.SkinnableCharonPortal.doPost(SkinnableCharonPortal.java:1186)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:592)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
    at
org.apache.catalina.cluster.session.JvmRouteBinderValve.invoke(JvmRouteBinderValve.java:210)
    at
org.apache.catalina.cluster.tcp.ReplicationValve.invoke(ReplicationValve.java:347)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
    at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:835)
    at
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:640)
    at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1286)
    at java.lang.Thread.run(Thread.java:595)


Tool Placement:
No Placement


Request:
:    AuthType:null
:    CharEncoding:UTF-8
:    ContentLength:38
:    ContentType:application/x-www-form-urlencoded
:    ContextPath:/portal
:    LocalAddress:129.180.3.47
:    LocalName:sakai-new.une.edu.au
:    LocalPort:80
:    Method:POST
:    PathInfo:/xlogin
:    Protocol:HTTP/1.1
:    QueryString:null
:    RemoteAddress:129.180.1.173
:    RemoteHost:129.180.1.173
:    RemotePort:53542
:    Requested URL:http://sakai-new.une.edu.au/portal/xlogin
:    Scheme:http
:    ServerName:sakai-new.une.edu.au
:    Headers:
:        Header:connection:keep-alive
:        Header:cookie:---censored---
:        Header:content-type:application/x-www-form-urlencoded
:        Header:content-length:38
:        Header:user-agent:Java/1.6.0_11
:        Header:host:sakai-new.une.edu.au
:        Header:accept:text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
:    Parameters:
:        Parameter:eid:0:----censored----
:        Parameter:pw:0:----censored----
:        Parameter:submit:0:Login
:    Attributes:
:
Attribute:sakai.session:org.sakaiproject.tool.impl.SessionComponent$MySession at e0897d0c
:        Attribute:sakai.character.encoding.done:sakai.character.encoding.done
:        Attribute:sakai.filtered:sakai.filtered
Session:
:    Created:1248232918802
:    LastAccess:1248232920708
:    MaxInactive:3600
:    Attributes:
:        Attribute:portalskin:defaultskin
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