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From Jeffrey Janner <Jeffrey.Jan...@PolyDyne.com>
Subject RE: httpd/Tomcat load balancing question
Date Wed, 22 Dec 2010 22:39:36 GMT
Thanks, that was what I was thinking.
Since the only JSP I have access to is the welcome-file, I'm not sure I can verify.

Q: I would think the getContextPath would be desirable, in case we change the war-file name,
etc., but I wouldn't think that would cause the jsessionID string to get appended to the end
of the path.  That is, they are coming out as "/Portal/static/images/icons/favicon.ico;jsessionid=B4E3E4AA3D79B8877A09CFCC32827D09.tomcat1".

Jeff

> -----Original Message-----
> From: André Warnier [mailto:aw@ice-sa.com]
> Sent: Wednesday, December 22, 2010 2:43 PM
> To: Tomcat Users List
> Subject: Re: httpd/Tomcat load balancing question
> 
> Hi.
> 
> Not knowing anything about JSP per se, I would nevertheless guess that
> the links are
> written using something like
> <img src="<%getContextPath%>/static/mylogo.jpg"/> or similarly, instead
> of just plain html
> <img src="/Portal/static/mylogo.jpg"/>.
> That probably leads the JSP compiler to think it has to "relativise"
> the links to the app
> context and so on, while in this case it should not, because they will
> be served by the
> front-end, not by Tomcat.
> 
> 
> 
> Jeffrey Janner wrote:
> > Httpd 2.2.17
> > Tomcat 6.0.29
> > Sun JDK 1.6.0_22
> > Spring Framework (3.0.2 I think)
> > All on Windows
> >
> > The Dev team is creating a new app that we are planning to deploy
> using httpd as a load-balancer to two Tomcats on separate servers.
> Httpd is configured to serve static files - graphics, css, etc. - with
> everything else being sent to the Tomcat servers over AJP.  The Tomcat
> app has one jsp file setup as the welcome-file, which just does a
> redirect to host/app/login, which is an internal action that generates
> the real login screen.  All other parts of the app are buried in the
> WEB-INF/classes structure (as far as I can tell).
> >
> > We are currently testing the setup, and if you go to
> http://prtltest.polydyne.com, everything seems to work just fine.  The
> browser gets redirected to http://prtltest.polydyne.com/Portal/login
> and the screen looks fine.  The problem is if you go directly to the
> login page, bypassing the welcome-file redirect, then you don't get the
> static files.  If you refresh the page, everything shows up again.
> >
> > Looking at the source of the login page, it appears that all the
> static links have the jsessionid appended to them on the first load,
> but not on subsequent loads.  I assume this is because Tomcat hasn't
> determined cookie support yet when it generates the page the first
> time, but does know about it on the refresh.  My question is, is there
> something the Dev team should be doing before generating the login
> page, or generating the static links, or is there a configuration
> setting I'm missing in the httpd.conf file?  Or perhaps in the web.xml?
> >
> > Jeff
> >
> > The httpd.conf file is pretty stock, with the following added for the
> load-balancer configuration:
> >
> > <Location /balancer-manager>
> >   SetHandler balancer-manager
> >
> >   Order Deny,Allow
> >   Deny from all
> >   Allow from 10.1.1 127.0.0.1
> > </Location>
> >
> > <Proxy balancer://mycluster>
> >                 BalancerMember ajp://prtltest01:8009/Portal
> route=tomcat1 loadfactor=50
> >                 BalancerMember ajp://prtltest02:8009/Portal
> route=tomcat2 loadfactor=50
> > </Proxy>
> >
> > ProxyPass /Portal/static !
> > ProxyPass /Portal balancer://mycluster
> stickysession=JSESSIONID|jsessionid scolonpathdelim=On
> > ProxyPass / balancer://mycluster/ stickysession=JSESSIONID|jsessionid
> scolonpathdelim=On
> >
> > The web.xml file is:
> >
> > <?xml version="1.0" encoding="UTF-8"?>
> > <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
> http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
> >     <display-name>Polydyne Portal Application</display-name>
> >     <!-- Log4J Config -->
> >     <context-param>
> >         <param-name>log4jConfigLocation</param-name>
> >         <param-value>/WEB-INF/log4j.properties</param-value>
> >     </context-param>
> >     <listener>
> >         <listener-
> class>org.springframework.web.util.Log4jConfigListener</listener-class>
> >     </listener>
> >     <context-param>
> >         <param-name>contextConfigLocation</param-name>
> >         <param-value>
> >             /WEB-INF/Portal-service.xml
> >             /WEB-INF/Portal-security.xml
> >         </param-value>
> >     </context-param>
> >     <listener>
> >         <listener-
> class>org.springframework.web.context.ContextLoaderListener</listener-
> class>
> >     </listener>
> >
> >     <!-- Concurrent Session Control -->
> >     <listener>
> >         <listener-
> class>org.springframework.security.web.session.HttpSessionEventPublishe
> r</listener-class>
> >     </listener>
> >
> >     <!-- Reads request input using UTF-8 encoding -->
> >     <filter>
> >         <filter-name>characterEncodingFilter</filter-name>
> >         <filter-
> class>org.springframework.web.filter.CharacterEncodingFilter</filter-
> class>
> >         <init-param>
> >             <param-name>encoding</param-name>
> >             <param-value>UTF-8</param-value>
> >         </init-param>
> >         <init-param>
> >             <param-name>forceEncoding</param-name>
> >             <param-value>true</param-value>
> >         </init-param>
> >     </filter>
> >     <filter-mapping>
> >         <filter-name>characterEncodingFilter</filter-name>
> >         <url-pattern>/*</url-pattern>
> >     </filter-mapping>
> >
> >     <!-- Spring Security settings start -->
> >     <filter>
> >         <filter-name>springSecurityFilterChain</filter-name>
> >         <filter-
> class>org.springframework.web.filter.DelegatingFilterProxy</filter-
> class>
> >     </filter>
> >     <filter-mapping>
> >         <filter-name>springSecurityFilterChain</filter-name>
> >         <url-pattern>/*</url-pattern>
> >     </filter-mapping>
> >     <!-- Spring Security settings end -->
> >     <!-- Servlet Definition -->
> >     <!--
> >      - Map static resources to the default servlet
> >      - examples:
> >      -     http://localhost:8080/static/images/pets.png
> >      -     http://localhost:8080/static/styles/petclinic.css
> >     -->
> >     <servlet-mapping>
> >         <servlet-name>default</servlet-name>
> >         <url-pattern>/static/*</url-pattern>
> >     </servlet-mapping>
> >
> >     <servlet>
> >         <servlet-name>Portal</servlet-name>
> >         <servlet-
> class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
> >         <load-on-startup>2</load-on-startup>
> >     </servlet>
> >     <servlet-mapping>
> >         <servlet-name>Portal</servlet-name>
> >         <url-pattern>/</url-pattern>
> >     </servlet-mapping>
> >     <!-- Servlet Definition End -->
> >     <session-config>
> >         <session-timeout>
> >             30
> >         </session-timeout>
> >     </session-config>
> >     <welcome-file-list>
> >         <welcome-file>redirect.jsp</welcome-file>
> >     </welcome-file-list>
> >     <error-page>
> >         <exception-
> type>javax.servlet.UnavailableException</exception-type>
> >         <location>/WEB-INF/views/errors/Unavailable.html</location>
> >     </error-page>
> >     <error-page>
> >         <exception-type>503</exception-type>
> >         <location>/WEB-INF/views/errors/Unavailable.html</location>
> >     </error-page>
> > </web-app>
> >
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