Should we try to access session scope in ADF BC ?

hi
In the blog post "How to Access Session Scope in ADF BC "
at http://andrejusb.blogspot.com/2012/01/how-to-access-session-scope-in-adf-bc.html
Andrejus Baranovskis suggests it is no problem to access session scope in ADF BC using
Map sessionScope = ADFContext.getCurrent().getSessionScope();But I wonder if this is really a good practice, as it looks very much like breaking the MVC pattern.
At the same time I wonder where the Oracle documentation says this would be a good or bad idea.
One starting point could be the ADFContext.getCurrent() method
at http://docs.oracle.com/cd/E24382_01/apirefs.1112/e17486/oracle/adf/share/ADFContext.html#getCurrent%28%29
that starts with saying "Gets the ADF context for the current thread. ..." which in a typical deployment scenario of ADF BC might not cause a problem.
But, I wonder how defensive your programming should be when using the getSessionScope() method in your ADF Business Component code (that implements the Model).
Ideas and feedback welcome.
many thanks
Jan Vervecken

Hi Shay,
Reviewing ADFContex methods it seems that this object shouldn't be accessible from BC. Example:
public static ADFContext initADFContext(java.lang.Object context,
                                        java.lang.Object session,
                                        java.lang.Object request,
                                        java.lang.Object response)
    Initializes the ADFContext for the environment of the specified context.
    Parameters:
        context - the ServletContext or PortletContext of the current execution environment.
        session - the HttpSession or PortletSession of the current execution environment. OPTIONAL.
        request - the HttpServletRequest or PortletRequest of the current execution environment. OPTIONAL.
        response - the HttpServletResponse or PortletResponse of the current execution environment. OPTIONAL.
    Returns:
        the ADFContext that was current when init was invoked. Should be passed back to resetADFContext after the block requiring the ADFContext has completed.Kuba

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http://forum.java.sun.com/thread.jspa?threadID=5122925&tstart=0

How can a session scope bean access an application scope bean - help

Hello,
I have a JSP page that has references to an Application Scope and a Session Scope bean...
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Hi,
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Hello,
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A)
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... doGet(...){}
... doPost(...){...}

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String key = "test";
String value = "This is the value";
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%>
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Hi,
In one of our projects we are trying to utilize the 2nd level cache of TopLink Essentials. The server code is using the Spring (2.0.7) and is deployed to a web container. We are using a Java client and serializes every object between the client and the server.
When a client is started a lot of "static/common" data is read from the server. The first client started will therefor pay some extra performance cost, but additional clients should hopefully be able to perform better due to the cache. Most of the static data is accessed not using JPQL and should therefor not bypass the cache.
If we configure the EntityManagerFactory using default Spring scoping (singleton) it seems like we are not able to utilize the cache. We can see from the log files that each time a client is started a lot of SQL is executed towards the database (Oracle).
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="jpaVendorAdapter">
      <bean class="org.springframework.orm.jpa.vendor.TopLinkJpaVendorAdapter">
        <property name="showSql" value="false" />
        <property name="generateDdl" value="$repository{toplink.generateDdl}" />
        <property name="database" value="$repository{toplink.database}" />
      </bean>
    </property>
    <property name="jpaProperties">
      <props>
        <prop key="toplink.weaving">static</prop>
        <prop key="toplink.logging.level">FINEST</prop>
      </props>
    </property>
</bean>When we changes the scoping to spring session the behavior is very different. Then we can see that the first client generates a lot of SQL towards the database and pays a startup cost, while subsequently clients seems to be able to utilize the cache.
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" scope="session">
    <aop:scoped-proxy />
    <property name="dataSource" ref="dataSource" />
    <property name="jpaVendorAdapter">
      <bean class="org.springframework.orm.jpa.vendor.TopLinkJpaVendorAdapter">
        <property name="showSql" value="false" />
        <property name="generateDdl" value="$repository{toplink.generateDdl}" />
        <property name="database" value="$repository{toplink.database}" />
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        <prop key="toplink.weaving">static</prop>
        <prop key="toplink.logging.level">FINEST</prop>
      </props>
    </property>
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Is this an accepted way of configuring the EntityManagerFactory or will there be a downside?
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Best regards,
Rune

Hi Rune,
To understand the shared cache behavior you actually need to understand more about what TopLink Essentials does than what Spring does. When a new factory is created, TopLink Essentials actually just proxies the server session with a factory instance, so the same server session is used. This is why you are seeing the same cache used across multiple factories of the same session.
In the first case, if you are not using JPQL then what are you using to load the data and why are you thinking that it will not bypass the cache?
Using a factory instance for each session is not what I would recommend doing as there are some additional costs associated with establishing a factory (even though the session already exists). The first way should be the correct way, I am just not sure what the circumstances are that are causing your cache to not be warmed. You may want to post more details about that so people can better help you out with that angle.
-Mike

Synchronizing session-scope objects?

          Hi,
          I have this problem, using Weblogic 5.1 SP8:
          In a JSP-file I use a java-object with the useBean-directive and
          session-scope.
          The problem occur when a user (for some strange reason) decides
          to double-click in his browser on a link pointing to this
          JSP-page.
          This makes the weblogic server start two separate request-threads to the same page
          in the same session. This will sometimes screw up tha data that the java-object holds
          since both threads at the same time uses the same object.
          The only solution that I have found is to put synchronized blocks in the JSP-file
          either synchronizing the java-object or the session-object.
          Does anyone have any similar problems or perhaps any opinions?
          regards/
          H Waller


          The problem we discussed (and fixed)was specifically in
          WLCS 3.2.
          If you are not using WLCS, you will not experience THAT problem.
          If you are using member servlet, member JSP variables or static
          variables, you will see a similar problem - don't.
          If it is data in the httpSession - you have to rethink your
          design.
          Mike
          "Ashutosh Khandelwal" <[email protected]> wrote:
          >
          >Hello Ture and Mike,
          >
          >I have been experiencing problems when a user decides to double-click
          >in the browser
          >pointing to a servlet. This makes the weblogic server start two seperate
          >request-thread
          >to the same page in the same session. This always screws up the data.
          >I am using
          >WLS 5.1 with SP8.
          >
          >According to your previous emails, this was only a problem with WLCS3.2,
          >which
          >uses PipelineSession. You have also indicated that this should not be
          >happening
          >with WLS 5.1 or 6.0 with SP8 or above.
          >
          >Well, I continue to have this problem with WLS5.1. Do you have any suggestions/opinion,
          >etc.
          >
          >regards,
          >
          >Ashu
          >
          >
          >
          >"Mike Reiche" <[email protected]> wrote:
          >>
          >>Thanks for the fast turn-around.
          >>
          >>- Mike
          >>
          >>Ture Hoefner <[email protected]> wrote:
          >>>Hello Mike,
          >>> As you know, a WLCS 3.2 (Commerce Server)
          >>>patch now exists for this problem. I thought
          >>>that I should post the details here to clear
          >>>up any confusion in the WebLogic user
          >>>community.
          >>> The problem that Mike experienced was that
          >>>the WLCS PipelineSession was keeping all
          >>>request-scoped attributes in a single bucket,
          >>>so concurrent requests from a single session
          >>>were experiencing naming collisions. Also,
          >>>one pipeline would empty the bucket when
          >>>finished, but other concurrent piplines may
          >>>have been using the bucket. This was not a
          >>>problem with WLS. It was a limitation of the
          >>>design of WLCS 3.2 PipelineSession, which is
          >>>not used in WLS 5.1 or 6.0.
          >>> Our engineering team has quickly responded:
          >>> they have designed and implemented a
          >>>PipelineSessionExtended that uses multiple buckets.
          >>> Each bucket is associated with a
          >>>request using a unique requestId.
          >>> A patch and details of the design fix and
          >>>use of the patch are available from support.
          >>>Please reference CR043462 when requesting the
          >>>patch.
          >>>
          >>>Mike Reiche wrote:
          >>>
          >>>> I don't mind that the HttpSession is shared,
          >>>my problem
          >>>> is that the PipelineSession is shared - because
          >>>that
          >>>> breaks <pipeline:getProperty > tags. When
          >>>I save a Pipeline
          >>>> propert as REQUEST_SCOPE, that's exactly what
          >>>I expect. But
          >>>> apparently, it's scope is beyond a request.
          >>>>
          >>>> What about a PageContext? That's not shared
          >>>between requests,
          >>>> is it? Maybe that's where REQUEST_SCOPE variables
          >>>should be
          >>>> stored.
          >>>>
          >>>> Mike
          >>>>
          >>>> Robert Patrick <[email protected]>
          >>>wrote:
          >>>> >Hmm...
          >>>> >
          >>>> >I always thought that it was browser specific
          >>>whether
          >>>> >the multiple browser windows
          >>>> >shared or did not share the same session
          >>>(and the Netscape
          >>>> >and IE do exactly the
          >>>> >opposite thing here). Regardless of the
          >>>multiple window
          >>>> >scenario, this can and will
          >>>> >happen if you have multiple frames in the
          >>>same window
          >>>> >making requests concurrently (or
          >>>> >possibly if you double-click on a link causing
          >>>the browser
          >>>> >to generate two requests to
          >>>> >WebLogic).
          >>>> >
          >>>> >Anyway, the crux of the matter is that your
          >>>servlets/JSPs
          >>>> >must be prepared to deal with
          >>>> >multiple requests from the same user accessing
          >>>the same
          >>>> >session. The servlet/JSP spec
          >>>> >doesn't, to my knowledge, address this issue.
          >>> You will
          >>>> >probably need to add
          >>>> >synchronization code somewhere, I would just
          >>>make sure
          >>>> >that you are synchronizing on an
          >>>> >object that is only used by one user (e.g.,
          >>>session) and
          >>>> >keep the synchronization
          >>>> >blocks as short as possible...
          >>>> >
          >>>> >Hope this helps,
          >>>> >Robert
          >>>> >
          >>>> >Michael Reiche wrote:
          >>>> >
          >>>> >> BEA says that's just your imagination....
          >>>> >>
          >>>> >> FR: nelson
          >>>> >>
          >>>> >> CASE_ID_NUM: 222714
          >>>> >> MESSAGE:
          >>>> >> Hi Michael,
          >>>> >>
          >>>> >> The Commerce Server is nothing more then
          >>>an application
          >>>> >riding
          >>>> >> on top of WebLogic Server.
          >>>> >> The HTTPSession is still being managed
          >>>by the WebLogic
          >>>> >Server,
          >>>> >> and not the Commerce Server.
          >>>> >> As I mentioned on my previous email, prior
          >>>to and including
          >>>> >SP6
          >>>> >> for WLS 5.1, the spawning of a child browser
          >>>window,
          >>>> >does create
          >>>> >> a shared HTTPSession, thus creating a shared
          >>>PipelineSession.
          >>>> >>
          >>>> >> If you have indeed upgraded to SP8 for
          >>>WLS 5.1, then
          >>>> >this should
          >>>> >> not be happening.
          >>>> >> Can you tell us exactly how you are spawning
          >>>the new
          >>>> >browser window,
          >>>> >> such that both requests are being sent
          >>>almost concurrently.
          >>>> >> Also, can you send us a copy of your "weblogic.log"
          >>>> >file from the
          >>>> >> Commerce Server as an attachment. If it
          >>>is large, please
          >>>> >zip it.
          >>>> >>
          >>>> >> Regards,
          >>>> >> Nelson Paiva
          >>>> >> WLCS DRE
          >>>> >>
          >>>> >> **********
          >>>> >> If you are replying to this email, please
          >>>DO NOT modify
          >>>> >the subject
          >>>> >> of
          >>>> >> this email in order to ensure that your
          >>>reply is processed
          >>>> >automatically.
          >>>> >>
          >>>> >> You can now "AskBEA" Customer Support questions
          >>>on the
          >>>> >web and
          >>>> >> get
          >>>> >> immediate responses. "AskBEA" is available
          >>>on http://www.bea.com/support/index.html
          >>>> >> **********
          >>>> >>
          >>>> >> "H Waller" <[email protected]>
          >>>wrote:
          >>>> >> >
          >>>> >> >Hi,
          >>>> >> >
          >>>> >> >I have this problem, using Weblogic 5.1
          >>>SP8:
          >>>> >> >
          >>>> >> >In a JSP-file I use a java-object with
          >>>the useBean-directive
          >>>> >> >and
          >>>> >> >session-scope.
          >>>> >> >The problem occur when a user (for some
          >>>strange reason)
          >>>> >> >decides
          >>>> >> >to double-click in his browser on a link
          >>>pointing to
          >>>> >this
          >>>> >> >
          >>>> >> >JSP-page.
          >>>> >> >This makes the weblogic server start two
          >>>separate request-threads
          >>>> >> >to the same page
          >>>> >> >in the same session. This will sometimes
          >>>screw up tha
          >>>> >> >data that the java-object holds
          >>>> >> >since both threads at the same time uses
          >>>the same object.
          >>>> >> >
          >>>> >> >The only solution that I have found is
          >>>to put synchronized
          >>>> >> >blocks in the JSP-file
          >>>> >> >either synchronizing the java-object or
          >>>the session-object.
          >>>> >> >
          >>>> >> >Does anyone have any similar problems
          >>>or perhaps any
          >>>> >opinions?
          >>>> >> >
          >>>> >> >regards/
          >>>> >> >H Waller
          >>>> >
          >>>
          >>>--
          >>>Ture Hoefner
          >>>BEA Systems, Inc.
          >>>2590 Pearl St.
          >>>Suite 110
          >>>Boulder, CO 80302
          >>>www.bea.com
          >>>
          >>>
          >>
          >

Session scope quary

hi friends,
i have a requrement to store FileItem(uploaded file using apache fileupload classes) objects in session scope using setAttrubute method.
would it be reliable to store these objects in session scope, so that further i can retrieve it again without having any problem?
is there any other solution?

The HTTP session is visible within the context scope of an individual user. This means that the only time that an object wouldn�t be simultaneously accessed would be if the user opens a couple browser windows using the same encode session id in the URL�s and uses\submits them simultaneously.
I guess that you could have the same distributed object EJB cache in session scope for two users but that should be handled for you by the EJB container.
I suppose the WebSphere session management in the web container has an option to maintain a common session across applications based on the users authentication. I can�t see how this could be a good thing....
You will want to cache objects in request scope when you don�t need to maintain state passed the request response lifecycle assuming that you are not using a heavy client caching system.
Objects in session scope will persist until the session is invalidated or the browser session is terminated.

Cannot lock session scope

Coldfusion 6.1, Dreamweaver 8.0, access 2003
All code is being written by Dreamweaver in this discussion.
I am not writing this code on my own.
I am new to both Dreamweaver and Coldfusion. I am setting up
the company intranet site. I want some parts restricted. I started
by creating a login page by using dreamweaver. My first problem was
when i was being directed towards the page for unsuccessful login
even though I know I typed in the correct username and password. I
have an access database holding this information. I am not using
security level. While researching this with another forum, I
decided to go to the next step and start putting the Restricted
Page code. This is when I discovered my second problem. When I
render the page, I get
CANNOT LOCK SESSION SCOPE - CFLock cannot be used to lock the
application or sessions shared scopes without these scopes being
established through the use of the CFAPplication tag. ....
My research tells me my problems are the result of same
problem.
In coldfusion Administrator, under Memory variables, I have
check marks for Enable Application Variables and Enable Session
Variables.
Then I found this article
http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_16564&sliceId=2.
I did what it said and it still does not work.
I have the file in two places
One at the root: C:\Inetpub\wwwroot\_mmServerScripts
One within the site:
C:\Inetpub\wwwroot\GIInet\_mmServerScripts
Do you know which one should have this tag? Should I have
both folders?
<CFAPPLICATION NAME="Name" SESSIONMANAGEMENT="Yes" >
Where it says "Name", do I leave Name there or do I put in a
name that is relative to my site and what is this .. the root
folder name?
Why do I have to pay for support for something that is not
obviously working?!?!

"Do you know which one should have this tag? Should I have
both folders?
<CFAPPLICATION NAME="Name" SESSIONMANAGEMENT="Yes" >"
Neither. It should be in the root folder of YOUR web
application.
'C:\\Inetpub\wwwroot' is a common web root for beginners. It
must be
included in every file that will be part of the same
application as
defined by the 'Name' parameter. The easiest way to do this
is the use
the Application.cfm|Application.cfc files that are
automatically part of
every file in the same and all sub directories.
"Where it says "Name", do I leave Name there or do I put in a
name that
is relative to my site and what is this .. the root folder
name?"
It is whatever string you want to use to define an
"Application" that
all files that share it will belong to. All files that have
the same
"Name" will share Application, Session and other common scope
variables
and other functionality. Again this must be included in every
file that
you want to be part of the same "Application". That is what
the
Application.cfm and|or Application.cfc files are for, so one
does not
have to hard code this line in every file, thought that would
be a
functional, if impractical, option.
"Why do I have to pay for support for something that is not
obviously
working?!?!"
Well, this is all explained in quite some detail in the
documentation
included with Dreamweaver and|or ColdFusion as well as online
at Adobe
and many other sites. The details and ins and outs are also
well
discussed on numerous blogs, forums and discussion lists. And
all those
resources are free.
But if one wants someone else to do the work for them, they
generally
need to pay for that help.

Should we try to access session scope in ADF BC ?

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