APPLICATION SCOPED DATASOURCE

Is possible to set the "Emulate two phase commit for non XA Driver" property for
an application scoped datasource??
Thanx

Similar Messages

Defining application-scoped work manager in Plan.xml

I am having trouble getting my MDBs to recognize work managers that I have defined in my deployment plan using the admin console.
The work managers show up properly when I click the deployed application and go to the Deployments->myapp.ear->Configuration->Workload tab. They do not show up, however on the Deployments->myapp.ear->Monitoring->Workload tab.
Also, when the server boots, I get a log message like this:
<BEA-002919> <Unable to find a WorkManager with name FaxErrorQueue. Dispatch policy FaxErrorQueue will map to the default WorkManager for the application care360-backend-app-2008>even though FaxErrorQueue shows up under Configuration->Workload.
BACKGROUND
I am upgrading an 8.1 wls to 10MP1. Our MDBs are deployed as a single jar, included in 2 separate ears, which are deployed to 2 separate clusters. So, if we have 2 clusters with 2 managed servers in each cluster, we deploy each MDB to all 4 servers. We control the Execute Queues for each server in 8.1 with different values so that MDB#1 might have a single thread in one managed server and zero execute threads on another. Using the deployment plan is the only way I can think of to implement this. We would prefer not to use the 8.1 emulation, as the deprecated execution queues will have to be dealt with eventually. I am open to any other approaches to accomplish this as well.
Thanks,
Joe

Hello Fred,
Thank you very much for reply.
I totally agree with you but in my scenario, I have multiple domains on a single box.
and I am afraid that there could be a situation where one bad application of a particular domain may take most of the CPU usages.
What I can do is: I can define max thread constrain to all the applications of all the domains but it is not acceptable bcz we have hundreds of applications per domain.
So what I want is: to define some kind of thread constrain at the domain level [so that I can have CPU usages allocated to every domain] as well as some kind of thread constrain to few applications [non prioritize].
I tried this by defining Global Work Managers & Application-scoped Work Managers but I found that applications only respect to Application-scoped Work Managers.
or if I have some kind of way that make sure certain percentage of CPU usages is allocated to a particular domain?
hope I have made my self clear.
Thanks,
Qumar

Application scoped objects in a cluster

Hi -
          Will weblogic clustering provide failover for Application scoped
          objects (in the ServletContext)? I've read through most of the
          documentation, and it doesn't mention anything. Also, the servlet 2.3
          spec says
          "Context attributes are local to the VM in which they were created.
          This prevents
          ServletContext attributes from being a shared memory store in a
          distributed
          container. When information needs to be shared between servlets
          running in a
          distributed environment, the information should be placed into a
          session (See
          Chapter SRV.7, “Sessions”), stored in a database, or set
          in an Enterprise
          JavaBeans TM component." (Section 3.4)
          However, it doesn't mention anything about failover.
          We have lots of application scoped objects that will need to failover
          somehow - anyone have experience with this?
          Thanks,
          Scott


Hi Scott,
          The application scoped objects (ServletContext) are per Web Container as
          explained in the spec. When the server hosting that Web Container dies, so
          too do the objects in the ServletContext.
          If you are looking something like ServletContext that is replicated across
          the cluster and supports failover, you should check out our Coherence
          product at http://www.tangosol.com/ -- that is exactly what it does.
          Peace,
          Cameron Purdy
          Tangosol Inc.
          Tangosol Coherence: Clustered Coherent Cache for J2EE
          Information at http://www.tangosol.com/
          "Scott Gilpin" <[email protected]> wrote in message
          news:[email protected]...
          > Hi -
          >
          > Will weblogic clustering provide failover for Application scoped
          > objects (in the ServletContext)? I've read through most of the
          > documentation, and it doesn't mention anything. Also, the servlet 2.3
          > spec says
          >
          > "Context attributes are local to the VM in which they were created.
          > This prevents
          > ServletContext attributes from being a shared memory store in a
          > distributed
          > container. When information needs to be shared between servlets
          > running in a
          > distributed environment, the information should be placed into a
          > session (See
          > Chapter SRV.7, “Sessions”), stored in a database, or set
          > in an Enterprise
          > JavaBeans TM component." (Section 3.4)
          >
          > However, it doesn't mention anything about failover.
          >
          > We have lots of application scoped objects that will need to failover
          > somehow - anyone have experience with this?
          >
          > Thanks,
          > Scott

Application scoped WorkManager

We have an application (.ear) which has two web apps (war's). We want to setup workmanager with max-threads-constraint for both the application. I was able to create application scoped workmanager through deployment descriptors However, I was not able to set the thread count other than the default (-1).
Note: The application (.ear) is targeted to a cluster.
Here is the snippet of the workmanager that I created in the weblogic.xml
<wl-dispatch-policy>workmanager-app1</wl-dispatch-policy>
<work-manager>
<name>workmanager-app1</name>
<max-threads-constraint>
<name>max-app1-threads</name>
<count>30</count>
</max-threads-constraint>
</work-manager>
Please let me know if any thing is wrong in the work-manager configuration. Any pointers on this is highly appreciated.

I need a mechanism to limit one of the webapp to use not more than 30 threads and the second webapp not more than 10 threads while targetting to the same cluster.

Work Manager both Global Work Managers & Application-scoped Work Managers

Hi all,
I want to use both Global Work Managers & Application-scoped Work Managers in my domain [single], is it possible?
Basically I want to make sure my domain have fix number of thread.
In my environment, I have multiple domains on a single machine, so I want to make sure every domain has fix number of threads to maintain the whole system integrity.
if I won't make sure this, there could be scenario that one particular domain is taking much of the CPU usages than others.
Thanks,
Qumar

Hello Fred,
Thank you very much for reply.
I totally agree with you but in my scenario, I have multiple domains on a single box.
and I am afraid that there could be a situation where one bad application of a particular domain may take most of the CPU usages.
What I can do is: I can define max thread constrain to all the applications of all the domains but it is not acceptable bcz we have hundreds of applications per domain.
So what I want is: to define some kind of thread constrain at the domain level [so that I can have CPU usages allocated to every domain] as well as some kind of thread constrain to few applications [non prioritize].
I tried this by defining Global Work Managers & Application-scoped Work Managers but I found that applications only respect to Application-scoped Work Managers.
or if I have some kind of way that make sure certain percentage of CPU usages is allocated to a particular domain?
hope I have made my self clear.
Thanks,
Qumar

ADF BC in ADF Swing application(global datasource connection)

Hi all!
I have ADF-Swing based application.
I have a standalone Weblogic server and global datasource (for example, name of datasource hrGlobal)
I want to use this datasource(hrGlobal) in my application module. All my entities and views must connect into the database, using this datasource.
The question is, how can I declare this remote connection in connections.xml, for using him in Application Module?
In forum or in documentation a can't find the answer for this question. So, any help is welcome:)
Thank you all for responses.
PS. JDeveloper version is 11.1.1.3
WLS version is 10.3.3

Thank you for links. Also, I found very useful link http://suns1988.blogspot.com/2011/02/adf-desktop-application.html
So, I had deployed application on WLS. Ear size is 95 MB with folder adfjars, that includes many jar libraries.
Now I'm trying to run WebStart file, but get an error "com.sun.deploy.net.JARSigningException: Found unsigned entry in resource: http://myurl:myport/testWebStart/adfjars/xmlparserv2.jar".
Can you help me, please?
And the 2-d question is about libraries in folder "adfjars": Can I share this libraries on WLS, than not to deploy each time in Ear archive?
Edited by: Stanislav on 01.05.2011 7:17

XML Application Scoping

I am trying to use the XML scoping feature to set the relevant XML / XSLT factories
using the weblogic-application.xml file (http://edocs.bea.com/wls/docs81/xml/xml_appscop.html).
I have a single webapp (war file) file that I am packaging inside an .ear archive.
However, these configuration seem to have no effect. I'm doing some logging
and see that the parser is still shown to be the XMLRegistry class. Does anyone
have this working?
- Tim

Hi Tim,
Did you update the MANIFEST.MF with the classpath to point to the
relevant jar in your package?
See step 2: http://edocs.bea.com/wls/docs81/xml/xml_appscop.html#1075700
Thanks,
Bruce
Tim Bardzil wrote:
>
I am trying to use the XML scoping feature to set the relevant XML / XSLT factories
using the weblogic-application.xml file (http://edocs.bea.com/wls/docs81/xml/xml_appscop.html).
I have a single webapp (war file) file that I am packaging inside an .ear archive.
However, these configuration seem to have no effect. I'm doing some logging
and see that the parser is still shown to be the XMLRegistry class. Does anyone
have this working?
- Tim

Help: PhaseListener -session or Application scoped?

Hi.,
I am using default PhaseListener in my backing bean's (for 2 beans) constructor with a method as shown below:
public void beforePhase(PhaseEvent event) {
resetValues();
}So whenever a page reloads then this method gets invoked. Its working pretty fine.
The problem is when I open a new browser and open the application's index page then resetValues() method got invoked.
I saw with debug that the PhaseListener array inside the lifecycle was having the old one's backing bean (PhaseListener).
I do I restrict the PhaseListener to session scope?
Any help is highly appreciated.

see the Javadocs of PhaseListener:
An interface implemented by objects that wish to be notified at the beginning and ending of processing for each standard phase of the request processing lifecycle.
http://java.sun.com/javaee/javaserverfaces/1.1/docs/api/javax/faces/event/PhaseListener.html

Restricting JDBC connection pool to specific Apps

Hi all,
We have an enterprise applications hosted in one instance where we have connection pools shared between all these applications, what I want is to specifiy which application is allowed whcih connectino pool so that other hosted apps woudn't be able to access the same connection.
I understand, the with scoping filter we can implement such thing, however it requires to have username/password embeded within the application which I don't want to happen..
your help is highly appeciated !

The only avenues for controlling access to datasources are by application-scoping,
applying datasource access permissions, and your controlling what application code
has the jndi lookup name for what datasource. I seem to recall in my dim memory
that perhaps long ago we were able to create application-scoped datasources from
the console, but I may be mistaken... I'll ask, but I am sure you can't do that now...

Scoping the toplink cache to application

Hi all, per Active Cache guide, the cache configuration can be scoped at the application level. This is what I am trying to do.
I have created shared libraries for coherence.jar, active-cahe jar and toplinkgrid jar and am including them in my application's weblogic-application.xml as library reference. The idea is that the cluster will be scoped within my application class loader.
Now, the next part is also to scope the cache configuration in my application. I have also created a JAR file which contains the cache configuration xml file and have created a shared library and included it as above.
However, with this, the log out put is as below
<Sep 16, 2010 11:11:22 AM CST> <Notice> <Stdout> <BEA-000000> <2010-09-16 11:11:22.391/691.970 Oracle Coherence GE 3.5.3/465p2 <Info> (thread=[STANDBY] ExecuteT
hread: '3' for queue: 'weblogic.kernel.Default (self-tuning)', member=n/a): Loaded cache configuration from "zip:D:/Oracle/Middleware11.1.1.3/coherence_3.5/lib/
coherence.jar!/reports/report-group.xml">
I have also tried placing the configuration JAR file in the application EAR file lib directory. I still get the above log statement.
So, the question is, how do I make coherence pick up my application scoped configuration. I read the Active Cache documentation, but I am not clear about this part.
Thanks.

You can use the system propety -Dtangosol.coherence.cacheconfig
to tell coherence which cache configuration you want to use, for example
-Dtangosol.coherence.cacheconfig=<location>/hibernate-cache-config.xml

In spite of Assembly Deployment being GlobalAssembly Cache solution contains resources scoped for web application

As per below snapshot of my SharePoint solution properties, my Assembly Deployment is GlobalAssembly Cache.
My solutions contains two features
1. Timer Job Feature - Scoped at Web Application Level
2. List Item Event Receiver - Scoped at Site Level
While deploying the solution I am asked to give Web Application Url and as per below snapshot it also contains Web Application Scoped resource.
What I am not able to figure out is why it shows in 'Contains Web Application Resource' as 'Yes' in spite of my
Assembly Deployment being GlobalAssembly Cache?
Secondly, when i deploy my solution, I find my webapplication level feature missing in UI. However the feature is installed and i find it to be visible when i check through powershell script.

Hi Benjamin,
If you're getting a Null Value error anywhere, that means a variable you're referencing isn't set to anything. If you're getting that try echoing out each variable after it's assigned to see if it's set to anything.
The link you are referring is for SharePoint 2010 and verified on Windows Server 2008 R2 and 2008, but not Windows Server 2012.
The approach in this case includes the following per the blog:
Check to see if a web application with the current specified URL is already in use – exit if it is
Check to see if an application pool with the name already exists. If so use it, otherwise create one
Create a web application based on the parameters specified
Assign the object cache properties to the new web application
Create policies for the object cache users to the web application
To simplified the code, we could use powershell below to check if web application and application pool have been already in use ahead. And skip the last two steps in the first time.
Get-SPWebApplication | fl displayname, applicationpool
Please refer to New-SPWebApplication
which is used to create a new web application within the local farm:
http://technet.microsoft.com/en-us/library/ff607931(v=office.15).aspx. Only two parameters i.e. ApplicationPool and Name are required, we could try a simple command at first:
Please run Get-SPManagedAccount to check the managed account, then execute the command below:
$ap = New-SPAuthenticationProvider
New-SPWebApplication -Name "Contoso Internet Site" -Port 2014 -ApplicationPool "ContosoAppPool" -ApplicationPoolAccount (Get-SPManagedAccount "Domain\Administrator")
-AuthenticationProvider $ap -SecureSocketsLayer
Regards,
Rebecca Tu
TechNet Community Support

Format of the JNDI name for lookup in DataSource

Hi
a) I have made a datasource in Weblogic 10.3 called SQL and its JNDI name as jdbc/SQLDS.
The driver was BEA'S Type 4 Driver for MS SQL Server
Now I am trying to lookup the datasource through an application. I have used the following
lines of code:
InitialContext context = new InitialContext();
DataSource ds = context.lookup("jdbc/SQLDS");
Connection conn = ds.getConnection();
The Application was a success.
I saw in some articles that you can refer to the datasource by even java:comp/env/jdbc/SQLDS,
instead of just jdbc/SQLDS. I tried both ways and I was able to run the application.
b) Then I made another datasource in Weblogic 10.3 called SQL1 and its JNDI name as jdbc/SQL1.
The driver was MS SQL Server Type 4 Driver for versions 2000, 2005
Now I am trying to lookup the datasource through an application. I have used the following
lines of code:
InitialContext context = new InitialContext();
DataSource ds = context.lookup("jdbc/SQL1");
Connection conn = ds.getConnection();
The Application was a success.
I saw in some articles that you can refer to the datasource by even java:comp/env/jdbc/SQL1,
instead of just jdbc/SQL1. I tried the first way and it didnt work. It gave me a NullPointerException
at the line Connection conn = ds.getConnection();
c)Then I made a 3rd datasource in Weblogic 10.3 called SQL2 and its JNDI name as jdbc/SQL2DS.
The driver was MS SQL Server Type 4 Driver for versions 2000, 2005
Now I am trying to lookup the datasource through an application. I have used the following
lines of code:
InitialContext context = new InitialContext();
DataSource ds = context.lookup("jdbc/SQL2DS");
Connection conn = ds.getConnection();
The Application was a success.
I saw in some articles that you can refer to the datasource by even java:comp/env/jdbc/SQL2DS,
instead of just jdbc/SQL2DS. I tried the first way and it didnt work. Again, it gave me a NullPointerException
at the line Connection conn = ds.getConnection();
I was confused why the 2nd and 3rd way didnt work . Is it becaue I used Microsoft's MS SQL Server Type 4 Driver?
I have added the jar file in the WEBLOGIC_CLASSPATH. Why is it not recognising java:comp/env/jdbc/SQL2DS ?
I would be grateful if somebody could give me ideas on this...
Thanks
Neeti

To use application scoped or indirect JNDI lookups (i.e. java:comp/env/...) you usually need to define a <resource-ref> entry in your deployment descriptor(s). Not sure what type of application you are using to test (web-app, EJB,) but for java:comp/env/ lookups to work, you need to define resource references. The fact that your first test succeeded is somewhat strange. Without the resource reference definitions, I would have expected your JNDI lookups to fail with a NamingException instead of the lookup returning NULL for the datasource.
Assuming you are doing your test from a web-app, you need to add <resource-ref> definitions to your web.xml file similar to the following:
<resource-ref>
<res-ref-name>*jdbc/SQL2DS*</res-ref-name>
<res-type>java.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
and then add <reference-descriptor> definitions to your weblogic.xml file similar to the following:
<reference-descriptor>
<resource-description>
<res-ref-name>*jdbc/SQL2DS*</res-ref-name>
<jndi-name>*jdbc/SQL2DS*</jndi-name>
</resource-description>
</reference-descriptor>
Once you do these steps your lookup("java:comp/env/jdbc/SQL2DS") should function properly from within your web-app.

Packaged jdbc modules and multi datasources

Is it possible to configure a multi-datasource within a packaged jdbc module within an application ear? It appears to me that multi-datasources are only supported as system datasources.

You can configure Multi-datasources within a packaged jdbc module:-
example :-
<jdbc-data-source xmlns="http://www.bea.com/ns/weblogic/91">
<name>examples-demoXA-multi-data-source</name>
<jdbc-data-source-params>
<jndi-name>examples-demoXA -multi-data-source</jndi-name>
<algorithm-type>Load-Balancing</algorithm-type>
<data-source-list>examples-demoXA,examples-demoXA-2</data-source-list>
</jdbc-data-source-params>
</jdbc-data-source>
All data sources in a multi data source for an application-scoped JDBC module must also be application scoped.
Link : http://edocs/wls/docs92/jdbc_admin/packagedjdbc.html

Short Dump while checking DataSource contents in R3 (Transaction RSA3)

Hello all,
I am having trouble with a DataSource (2LIS_11_VAITM) in the R3 Source System (IDES 6.0). When I try to view the contents of this DataSource through Transaction RSA3, I get the following Short Dump Error.....
Could someone pls help me with this.
Thanks,
SD
============================================================================
Runtime Errors         CONNE_IMPORT_WRONG_STRUCTURE
Except.                CX_SY_IMPORT_MISMATCH_ERROR
Date and Time          18.03.2009 09:56:23
Short text
     Error when importing object "MC11VA0ITM_TAB".
What happened?
     Error in the ABAP Application Program
     The current ABAP program "SAPLMCEX" had to be terminated because it has
     come across a statement that unfortunately cannot be executed.
Error analysis
     An exception occurred that is explained in detail below.
     The exception, which is assigned to class 'CX_SY_IMPORT_MISMATCH_ERROR', was
      not caught in
     procedure "MCEX_BW_LO_API" "(FUNCTION)", nor was it propagated by a RAISING
      clause.
     Since the caller of the procedure could not have anticipated that the
     exception would occur, the current program is terminated.
     The reason for the exception is:
     When attempting to import data, the
     structure of the complex object "MC11VA0ITM_TAB" was not compatible with the
     target object. The error occurred with component no. 31.
Missing RAISING Clause in Interface
     Program                                 SAPLMCEX
     Include                                 LMCEXU06
     Row                                     1
     Module type                             (FUNCTION)
     Module Name                             MCEX_BW_LO_API
Trigger Location of Exception
     Program                                 SAPLMCEX
     Include                                 LMCEXU06
     Row                                     263
     Module type                             (FUNCTION)
     Module Name                             MCEX_BW_LO_API

Hi SD,
The 11_Vaitm is a LO datasource, before checking its data setup tables need to be filled for it.
For filling the setup tables, first you have to delete the existing setup table data and ensure all the delta queues are empty.
Delete the setup tables: Go to TCODE LBWG and in the application give 11 and execute.
Delete all entries in Delta Queue, TCODE RSA7 for application 11.
Delete the entries in logistic queue: Check in TCODE SMQ1, if there are any entries for application .
Refill the setup tables: SBIW -> Settings for application specific datasources -> Logistics -> anaging extract strucutre -> Initilization -> Filling the setup table ->Application specific setup of data -> SD-Sales order perform setup.
Then try RSA3. Hope it helps.
Regards,
Pankaj

ConcurrentModificationException while running the deployed application

Hi,
I am using JDeveloper 11.1.2.0.0 and WebLogic Server Version: 10.3.5.0 with production environment.
My application is based on Customized Dynamic Tab Shell where each task flow is loaded with its own transaction and also it is defined not to share data control.
I use a Collection Object inside TabContext class, which will be accessed and consumed (including modifications) by all dynamic tab loaded taskflow.
I use Customized FactoryClass for every BC4JDataControl to track the request and also to pass parameter to model layer AMs
When i run the application in local, i didn't get any error. But when i check the deployed application, I am getting ConcurrentModificationException frequently as javascript dialog
java.util.ConcurrentModificationException
ADF_FACES-60097: For more information, please see the server's error log for
an entry beginning with: ADF_FACES-60096:Server Exception during PPR, #181When i check the server error log, it didn't say anything about my classes.
[2011-10-04T01:35:33.608-07:00] [MDA1-Server01] [ERROR] [] [oracle.adfinternal.view.faces.config.rich.RegistrationConfigurator] [tid: [ACTIVE].ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)'] [userId: <anonymous>] [ecid: 11d1def534ea1be0:-38985633:132c98ea02d:-8000-000000000000b88b,0] [APP: CalwinApplication] ADF_FACES-60096:Server Exception during PPR, #55[[
java.util.ConcurrentModificationException
     at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
     at java.util.AbstractList$Itr.next(AbstractList.java:343)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:619)
     at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
     at oracle.adfinternal.view.faces.renderkit.rich.PageTemplateRenderer.encodeAll(PageTemplateRenderer.java:69)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:493)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:913)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1661)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:607)
     at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:623)
     at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
     at oracle.adfinternal.view.faces.renderkit.rich.RegionRenderer._encodeChildren(RegionRenderer.java:310)
     at oracle.adfinternal.view.faces.renderkit.rich.RegionRenderer.encodeAll(RegionRenderer.java:186)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:493)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:913)
     at oracle.adf.view.rich.component.fragment.UIXRegion.encodeEnd(UIXRegion.java:323)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1661)
     at org.apache.myfaces.trinidad.component.UIXGroup.encodeChildren(UIXGroup.java:170)
                .....On checking further about this error code in Oracle® Fusion Middleware Error Messages Reference 11g Release 2 (11.1.2.0.0), it is given as
ADF_FACES-60097: For more information, please see the server's error log for an
entry beginning with: {0}
Cause: An exception was thrown durring a PPR request.
Action: Please look in the servers error log for more details on this error.
Level: 1
Type: ERROR
Impact: LoggingI couldn't get any hint on what may be the issue. Can anyone help on this?
Thanks in Advance.
Perumal S

I've seen this happen before if component objects are stored in managed beans (e.g. using binding="#{someBean.foo}").
Problems like this can happen if the component is stored directly on the bean as a member variable (most commonly if the bean is application-scoped, session-scoped, or pageFlow-scoped but smaller scopes can exhibit the problem too).
Usually just referencing the components from the accessors on JSF event objects during an event handlers or using one of the various component searching APIs (e.g. findComponent) can suffice in locating the components dynamically.
However, if using one of those mechanisms isn't feasible you must use the ComponentReference as the storage mechanism (and follow the caveats noted in its JavaDoc):
http://www.jarvana.com/jarvana/view/org/apache/myfaces/trinidad/trinidad-api/2.0.0-beta-1/trinidad-api-2.0.0-beta-1-javadoc.jar!/org/apache/myfaces/trinidad/util/ComponentReference.html
Hope this helps,
Matt

APPLICATION SCOPED DATASOURCE

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