On Apr 11, 2011, at 12:45 PM, János Löbb wrote:
> Hi,
>
> /Tomcat 7.0.10, OSX 10.6.5, jk 1.2.31, and httpd 2.2.17/
>
> Without any explicit parameters in server.xml, just by setting the jvmRoute
> attribute in the Engine element and enabling Clustering, session failover
> worked if I shut down one or the other tomcat instance or the one httpd that
> was not the reverse proxy.
>
> However when I just stopped the example webapp in one tomcat, the session did
> not failover and I received a 404 http error instead of the expected session
> page from the other tomcat.
>
> Based upon the instructions found in the book:
> http://proquest.safaribooksonline.com/9780596101060/tomcat_6_clustering_implementation?sessionid=&reader=html&imagepage=
>
> explicitely:
>
> <nyissz>
> You'll also need to add distributed="true" to the webapp's <Context> element.
> If there is no <Context> element declared for it anywhere, you will need to
> create one. You can create one by making a
> newCATALINA_HOME/conf/[EngineName]/[HostName]/examples.xml context XML
> fragment file or by adding one to server.xml.
> <nyassz>
>
> my thought was that the ReplicatedContect was not initiated. Well, I already
> learned that I should not add any context into server.xml and there is
> nothing in the
>
> bml0066:local administrator$ ls -l tomcat1/conf/Catalina/localhost/
> bml0066:local administrator$
>
> directory, so I created a META-INF directory inside the examples directory
> and placed a context.xml there with the following content:
>
> bml0066:local administrator$ cat
> tomcat1/webapps/examples/META-INF/context.xml
> <?xml version="1.0" encoding="UTF-8"?>
> <Context className="org.apache.catalina.ha.context.ReplicatedContext"
> distributed="true" >
> </Context>
>
> I did it on both tomcats and bounced them. Now when I look the log, I see
> the following warning just after restart:
>
> INFO: Deploying web application directory examples
> Apr 11, 2011 12:00:28 PM org.apache.catalina.startup.SetContextPropertiesRule
> begin
> WARNING: [SetContextPropertiesRule]{Context} Setting property 'distributed'
> to 'true' did not find a matching property.
> Apr 11, 2011 12:00:28 PM
> org.apache.catalina.tribes.tipis.AbstractReplicatedMap init
> INFO: Initializing AbstractReplicatedMap with context name:/examples
> Apr 11, 2011 12:00:28 PM org.apache.catalina.core.ApplicationContext log
> INFO: ContextListener: contextInitialized()
> Apr 11, 2011 12:00:28 PM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener: contextInitialized()
>
>
> So the first question is, should I use the distributed="true" property here ?
> Is the book right ? I think it is from 2007. I already have the
> <distributable/> tag in the webapp's web.xml.
>
> The second question is what to do to avoid the 404 message and fail the
> session over instead of it, when I just stop the webapp on the tomcat
> instance? By default I am using sticky sessions.
>
> <nyissz>
> bml0066:local administrator$ cat apache2/conf/workers.properties
> worker.list = lb,jkstatus
>
> worker.lb.type=lb
> worker.lb.balance_workers=tomcat1,tomcat3
> #,tomcat2,tomcat4
> worker.lb.sticky_session = True
> worker.lb.sticky_session_force = False
>
> worker.jkstatus.type=status
>
> worker.tomcat1.type = ajp13
> worker.tomcat1.host = bml0066.yalepath.org
> worker.tomcat1.port = 8109
> worker.tomcat1.lbfactor = 1
> worker.tomcat1.redirect=tomcat3
>
> #worker.tomcat2.type = ajp13
> #worker.tomcat2.host = bml0066.yalepath.org
> #worker.tomcat2.port = 8209
> #worker.tomcat2.lbfactor = 1
> #worker.tomcat2.redirect=tomcat4
>
> worker.tomcat3.type = ajp13
> worker.tomcat3.host = bml0065.yalepath.org
> worker.tomcat3.port = 8309
> worker.tomcat3.lbfactor = 1
> worker.tomcat3.redirect=tomcat1
>
> #worker.tomcat4.type = ajp13
> #worker.tomcat4.host = bml0065.yalepath.org
> #worker.tomcat4.port = 8409
> #worker.tomcat4.lbfactor = 1
> #worker.tomcat4.redirect=tomcat2
>
> <nyassz>
>
> Thanks ahead,
>
> János
>
>
>
Testing out he examples webapp I found this in the log of that tomcat where I
shut down the webapp:
<nyissz>
INFO: Server startup in 6625 ms
Apr 11, 2011 12:43:59 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
sessionCreated('1CAEC5FA2D27A7410C819A8BBF9E7F77.tomcat1')
Apr 11, 2011 12:47:23 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
sessionCreated('69EB2E77CE0D912F8584E60B4CB828D7.tomcat3')
Apr 11, 2011 12:47:46 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
attributeAdded('69EB2E77CE0D912F8584E60B4CB828D7.tomcat3', 's1', 't3')
Apr 11, 2011 12:48:40 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: init: Associated with Deployer
'Catalina:type=Deployer,host=localhost'
Apr 11, 2011 12:48:40 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: init: Global resources are available
Apr 11, 2011 12:48:54 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: list: Listing contexts for virtual host 'localhost'
Apr 11, 2011 12:49:01 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: stop: Stopping web application '/examples'
Apr 11, 2011 12:49:01 PM org.apache.catalina.ha.session.DeltaManager
stopInternal
INFO: Manager [localhost#/examples] expiring sessions upon shutdown
Apr 11, 2011 12:49:01 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
sessionDestroyed('69EB2E77CE0D912F8584E60B4CB828D7.tomcat3')
Apr 11, 2011 12:49:01 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
attributeRemoved('69EB2E77CE0D912F8584E60B4CB828D7.tomcat3', 's1', 't3')
Apr 11, 2011 12:49:01 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
sessionDestroyed('1CAEC5FA2D27A7410C819A8BBF9E7F77.tomcat1')
Apr 11, 2011 12:49:01 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextDestroyed()
Apr 11, 2011 12:49:01 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextDestroyed()
Apr 11, 2011 12:49:01 PM org.apache.catalina.core.ApplicationContext log
SEVERE: HTMLManager: ManagerServlet.stop[/examples]
java.lang.NullPointerException
at
org.apache.catalina.ha.context.ReplicatedContext.stopInternal(ReplicatedContext.java:86)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:225)
at
org.apache.catalina.manager.ManagerServlet.stop(ManagerServlet.java:1273)
at
org.apache.catalina.manager.HTMLManagerServlet.stop(HTMLManagerServlet.java:754)
at
org.apache.catalina.manager.HTMLManagerServlet.doPost(HTMLManagerServlet.java:222)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:186)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:591)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.ha.tcp.ReplicationValve.invoke(ReplicationValve.java:333)
at
org.apache.catalina.ha.session.JvmRouteBinderValve.invoke(JvmRouteBinderValve.java:218)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
Apr 11, 2011 12:49:01 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: list: Listing contexts for virtual host 'localhost'
Apr 11, 2011 12:49:48 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: start: Starting web application '/examples'
Apr 11, 2011 12:49:48 PM org.apache.catalina.core.ApplicationContext log
SEVERE: FAIL - Application at context path /examples could not be started
org.apache.catalina.LifecycleException: An invalid Lifecycle transition was
attempted ([before_start]) for component
[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/examples]]
in state [STOPPING]
at
org.apache.catalina.util.LifecycleBase.invalidTransition(LifecycleBase.java:386)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:139)
at
org.apache.catalina.manager.ManagerServlet.start(ManagerServlet.java:1223)
at
org.apache.catalina.manager.HTMLManagerServlet.start(HTMLManagerServlet.java:735)
at
org.apache.catalina.manager.HTMLManagerServlet.doPost(HTMLManagerServlet.java:220)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:186)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:591)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.ha.tcp.ReplicationValve.invoke(ReplicationValve.java:333)
at
org.apache.catalina.ha.session.JvmRouteBinderValve.invoke(JvmRouteBinderValve.java:218)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
Apr 11, 2011 12:49:48 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: list: Listing contexts for virtual host 'localhost'
<nyassz>
so, tomcat did go into a state that does not allow the app be started correctly
via the manager webapp. When I try to access it via a browser I receive:
<nyissz>
HTTP Status 404 - /examples/servlets/servlet/SessionExample
type Status report
message /examples/servlets/servlet/SessionExample
description The requested resource (/examples/servlets/servlet/SessionExample)
is not available.
Apache Tomcat/7.0.10
<nyassz>
I have to restart the tomcat instance and all the other webapps with it to get
it out from that stage producing the 404 message.
Is there a better way ?
Thanks ahead,
János
