Hi,

Sorry if I'm bothering you with something simple, but I've searched the web
and couldn't find any help on this.

I'm using Continuum 1.3.6 on a Tomcat 6.0.20 server and a MySQL database.

Whenever I don't access Continuum for some time, when I open the main page I
get a strange error. If I reload the page this error disappears and
Continuum works just fine. This happens over and over. I'm also using
Archiva and the same happens. I suppose it is something related with
database access. 

Do you have any idea on what could be causing this error?

The error I get is:

Error Occured
org.codehaus.plexus.redback.users.UserManagerException: Unable to get object
'org.codehaus.plexus.redback.users.jdo.JdoUser', id 'guest', fetch-group
'null' from jdo store.

Stack Trace
org.codehaus.plexus.redback.users.UserManagerException: Unable to get object
'org.codehaus.plexus.redback.users.jdo.JdoUser', id 'guest', fetch-group
'null' from jdo store.
        at
org.codehaus.plexus.redback.users.jdo.JdoUserManager.getObjectById(JdoUserMa
nager.java:417)
        at
org.codehaus.plexus.redback.users.jdo.JdoUserManager.findUser(JdoUserManager
.java:339)
        at
org.codehaus.plexus.redback.users.AbstractUserManager.getGuestUser(AbstractU
serManager.java:114)
        at
org.codehaus.plexus.redback.users.cached.CachedUserManager.getGuestUser(Cach
edUserManager.java:148)
        at
org.codehaus.plexus.redback.users.configurable.ConfigurableUserManager.getGu
estUser(ConfigurableUserManager.java:128)
        at
org.codehaus.plexus.redback.authorization.rbac.RbacAuthorizer.isAuthorized(R
bacAuthorizer.java:100)
        at
org.codehaus.plexus.redback.system.DefaultSecuritySystem.authorize(DefaultSe
curitySystem.java:167)
        at
org.codehaus.plexus.redback.system.DefaultSecuritySystem.isAuthorized(Defaul
tSecuritySystem.java:179)
        at
org.apache.maven.continuum.web.action.ContinuumActionSupport.checkAuthorizat
ion(ContinuumActionSupport.java:150)
        at
org.apache.maven.continuum.web.action.ContinuumActionSupport.checkAuthorizat
ion(ContinuumActionSupport.java:132)
        at
org.apache.maven.continuum.web.action.ContinuumActionSupport.checkViewProjec
tGroupAuthorization(ContinuumActionSupport.java:178)
        at
org.apache.maven.continuum.web.action.GroupSummaryAction.isAuthorized(GroupS
ummaryAction.java:118)
        at
org.apache.maven.continuum.web.action.GroupSummaryAction.execute(GroupSummar
yAction.java:61)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionIn
vocation.java:404)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActi
onInvocation.java:267)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:229)
        at
org.apache.struts2.interceptor.MessageStoreInterceptor.intercept(MessageStor
eInterceptor.java:195)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(D
efaultWorkflowInterceptor.java:221)
        at
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(Method
FilterInterceptor.java:86)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(Validati
onInterceptor.java:150)
        at
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.do
Intercept(AnnotationValidationInterceptor.java:48)
        at
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(Method
FilterInterceptor.java:86)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.apache.maven.continuum.web.interceptor.ForceContinuumConfigurationInterc
eptor.intercept(ForceContinuumConfigurationInterceptor.java:70)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.codehaus.plexus.redback.struts2.interceptor.PolicyEnforcementInterceptor
.intercept(PolicyEnforcementInterceptor.java:115)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.codehaus.plexus.redback.struts2.interceptor.SecureActionInterceptor.inte
rcept(SecureActionInterceptor.java:173)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(D
efaultWorkflowInterceptor.java:221)
        at
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(Method
FilterInterceptor.java:86)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(Validati
onInterceptor.java:150)
        at
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.do
Intercept(AnnotationValidationInterceptor.java:48)
        at
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(Method
FilterInterceptor.java:86)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(Con
versionErrorInterceptor.java:123)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(Parame
tersInterceptor.java:184)
        at
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(Method
FilterInterceptor.java:86)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(St
aticParametersInterceptor.java:105)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterce
ptor.java:83)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInt
erceptor.java:207)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDr
ivenInterceptor.java:74)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(S
copedModelDrivenInterceptor.java:127)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(Prof
ilingActivationInterceptor.java:107)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(Debu
ggingInterceptor.java:206)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingIn
terceptor.java:115)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nIntercepto
r.java:143)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareIn
terceptor.java:121)
        at
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(Method
FilterInterceptor.java:86)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletCon
figInterceptor.java:170)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasIntercep
tor.java:123)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(Ex
ceptionMappingInterceptor.java:176)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.codehaus.plexus.redback.struts2.interceptor.AutoLoginInterceptor.interce
pt(AutoLoginInterceptor.java:167)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.codehaus.plexus.redback.struts2.interceptor.ForceAdminUserInterceptor.in
tercept(ForceAdminUserInterceptor.java:77)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.codehaus.plexus.redback.struts2.interceptor.EnvironmentCheckInterceptor.
intercept(EnvironmentCheckInterceptor.java:97)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:224)
        at
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionI
nvocation.java:223)
        at
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack
.java:455)
        at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocati
on.java:221)
        at
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:50)
        at
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:504)
        at
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.jav
a:422)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
        at
com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java
:118)
        at
com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:
52)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
        at
org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCle
anUp.java:99)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
        at
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(Char
acterEncodingFilter.java:96)
        at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestF
ilter.java:76)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:233)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:191)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128
)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102
)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:109)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http
11Protocol.java:583)
        at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
        at java.lang.Thread.run(Thread.java:619)

Thanks in advance,
Bruno Antunes

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