Transaction control of app module implementation , from a SLSB

Hi, We are using a Session bean , to invoke app module implementation - service methods to manipulate VOs.
The service method of app module is having control of transactions , like commit . We want to have this control from stateless session bean.
Could some one help me ? Thanks .

Hi,
expose a custom client method on the ADF BC module and have this method (in AM impl) calling commit.
Frank

Similar Messages

Transaction management in App module

Hi -
I have a scenario where my db operation needs to participate in the distributed transaction. This operation will be called by a SOA service. So, i have created a custom class and custom method in my application module and exposed that as service interface. Now assume that a SOA service is making 3-4 sequence of calls to some other external systems. In between it is calling my custom method as well. Like
step 1) call to extenal system 1
step 2) call to external system 2
step 3) call to AM's method exposed through service interface.
step 4) call to extenal system 3.
In the above scenario, if any one of the call fails, SOA service has to rollback all the steps. In such scenario, can the AM's custom method (3rd step) participate in the transation and rolled back when 4 th step fails?
Thanks & regards
Aravindan

Thanks for the response.
In the oracle documentation (section 11.3.7 in http://download.oracle.com/docs/cd/E14571_01/web.1111/b31974/bcextservices.htm), it has been mentioned that "remote call is stateless, and the remote service will not participate in the same transaction as the business component that uses a service-enabled application module's service interface"
"If you successfully call a remote service that results in modifying data, and then subsequently your local transaction fails for any reason, then it is the responsibility of your error handling code to perform a *compensating transaction* against the remote service to "undo" the previous change made"
any thoughts/suggestions?

Nesting App Modules from ADFLibs - jdev 11.1.2.3

Hello:
I have a dashboard application with 6 tabs. On each tab is a bounded task flow from an ADFLib. Note: each BTF has its own App Module.
In the Master DashBoard App, the ADFLibs BTF's are dropped as regions in each tab. The Master App has its own application module and I want to nest each of the BTF App Modules under the single App Module in the Master app. The reason is that each tab of the application currently creates a seperate DB connection. I want the Master App to only create one DB connection for the entire application.
In the resource pallet, I can see the App Modules from the seperate ADFLibs, and I have added these App Modules to the Master Project, but the newly added AM does not display under the Master App Module for me to nest. (in App Module ->- Data Model --> Application Module Instances)
How can I nest multiple AM's from ADFLibs under a single Master App Module? ( the AM from ADFLibs do not display in Application Module Instances in the Master App)
Thanks

Have I added the application Modules to the Master Model?
Answer:
In the Master, In the Resource Pallet, I highlighted the Application Module in the ADFLibs (from Subsystem), right clicked and selected Add to Project. But this did not make the App Module display in the Master App Module Application Module Instances. (Note: my subsystem adflibs are deployed from ViewController with dependency on Model. I tried to hightlight App Module above and add to Model Project of Master in above) This caused WebLogic to fail to deploy.
What is the correct way to add an App Module from an ADFLIb subsystem and add the AM to the Master App so it displays in the Master App Module Application Module Instances?
All subsystems should use the same connection and all subsystems are set to No Controller Transaction and Share data controls with calling task flow is checked for all subsystem.
More testing revealed:
One thing to note: each of my subsystem, a deployment profile was created on the ViewController with dependency on its Model project. When I added the subsystem project above to add the AM, I adding the App Module from the adflib to the Model project of the master. This caused WebLogic to fail during deploy.
So I tried another test. In the subsystem, I created another deployment profile, on just the Model project and created an adflib. I added this new adflib to the Model project of the Master. The App Module from the subsystem now shows up in the Application Module Instances. (which I selected and moved over to the right to nest under Master App Module. This time the application ran, but still have one connection per tab.)
Do you create ADFLibs with a deployment profile on the VC with dependancy to the Model Project? Or do you create two seperate ADFLibs for subsystems, one for VC project only and one for Model project only?
Thanks for the help.

Is it possible to call a custom method in App Module from a backing bean?

I would like to know if a custom method in App Module can be called from inside a backing bean.
I am not sure if it is logically right to call, from a backing bean, a custom method in App Module. But would like to know if that makes sense or if it is possible.

Hi..
Yes it is possible.You have to add that method for client interface of AppModule.Now you can see that method in Data Controls(Refresh the data control). To call this method using bean it should add as method action to bindings(Click Bindings>+>methodAction>and Create action binding).
Now you can call this method in bean class.
Check following example use this concept to execute view criteria
http://adf-lk.blogspot.com/2011/05/oracle-adf-create-view-criteria-and_4727.html

Transaction Management - App Module in Stateless Session Bean

Hi All,
We are using Application Module in local mode in a Stateless Session Bean. The application module gets the database connection from the datasource of the application server(Oracle 9iAS).
The problem that we are facing is as follows
- When a database update/insert is made using the Application Module and the ViewObject (and the underlying Entity Object), the changes are not being commited.
Please note that we are not using the ApplicationModule.getTransaction.commit() as it does not give us commit/rollback control from another Session Bean/UseCase. We instead are relying on the Container to manager the transaction and commit the database changes. But the container does not seem to refresh the changes to the database.
Q1 - Is there a contract between the container and the application module that needs to be created so that the container managed-transaction and the application module work together ?
Any help in this matter would be greatly appreciated.
-Ankur Sinha

Q1 - Is there a contract between the container and the application module that needs to be created so that the container managed-transaction and the application module work together ?For stateless beans you have to call postChanges in the business method for the changes to be applied to the db. For stateful beans bc4j we do that automatically just before the transaction ends.
Take a look at the following howto
http://otn.oracle.com/products/jdev/howtos/bc4j/ejbstateless_with_bc4j.html
In 9.0.3 you'll be able to create a stateless service bean declaritively.
dhiraj Hi dhiraj,
- I looked at the example but was not able to find the ContainerManagedTxnHandlerImpl class in the BC4J jars. Can you point me to the latest version of BC4J on technet ?. I already have JDeveloper 9.0.2
- Regarding your response, what do you mean by creating stateless service bean declaritively ?
Thanks,
Ankur

ADF Libary Issue - Application Module disappear from data control

Hi All,
I am facing an issue while adding an Application module to an ADF project as an ADF libray.
I have two applications - ADF Application1 with Model1 project having an Application module AM1, ADF Application2 with Model2 project having an Application Module AM2
I have created an ADF library jar file of Model1 project.
When I add it to Model2 project, the Application Module AM2 of Model2 disappears and Application Module AM1 from the library appears in data control.
Please suggest what could be wrong.
Regards,
Rekha

Hi,
verify that both application modules don't share the same ID in their databindings.cpx file. Which release version of JDeveloper 11g are you on ?
Frank

Since upgrading from Mavericks to Yosemite Mail, Spotlight,Mission Control and App-Store don´t work correctly. Is it possible to return to Mavericks?

Since upgrading from Mavericks to Yosemite Mail, Spotlight, Mission Control and App-Store don´t work correctly. Is it possible to return to Mavericks?

If you have an external drive with an OS X Time Machine backup, then do restore of your last backup. If you have an external drive with a bootable clone of your previous system, you can boot to that clone and re-clone the OS X on your external drive back to your Mac's internal drive.
If you do not have either of these available, then the reverting/restoring process becomes much more complicated and involves purchasing an external drive and backing up your current system to that drive, then erasing, reformatting your hard drive and now your only options to installng an OS X version is doing a clean install of OS X 10.6 Snow Leopard, then upgrading, again, to either OS X 10.7 Lion or 10.8 Mountain Lion. OS X 10.9 Mavericks is no longer available for download and Apple has not made OS X 10.9 Mavericks available in any other form to be able to redownload and install.
Maybe it would be better to explain in detail your issues with Yosemite to see if any of us here can help you with your difficulties.
I am not running or using Yosemite, so I cannot help you with your Yosemite issues,
There are others here who can help you with Yosemite.
Good Luck.

How to call an App Module from another App Module?

Here are the settings for my project.
MyApplication (Application)
Model1 (Project) : Has connection settings to connect to schema1
Model2 (Project) : Has connection settings to connect to schema2
ViewController (Project) : View project
How do I call Model2 from Model1 ? I tried calling findApplicationModule but that did not work.
Can I get access to the AppModule from JNDI tree? How else can I get access to Model2 from Model1?
Thanks

This is the code that is getting called from App Module 1. The first method, test1, throws an error where as test2 is successful. Do you see any obvious errors in the code?
public String test1() {
System.out.println("This is test1");
String amDef = "org.model.service.HrService";
String config = "HrServiceLocal";
ApplicationModule am2 = (ApplicationModule ) Configuration.createRootApplicationModule(amDef,config);
HrServiceImpl am3 = (HrServiceImpl)am2;
am3.test123();
Configuration.releaseRootApplicationModule(am2, true);
//return am2;
return "test1";
Error:
Internal Server Error (Caught exception while handling request: oracle.jbo.ConfigException: JBO-33005: Configuration HrServiceLocal not found)
public String test2() {
String AMDefName = "org.model.service.HrService";
Hashtable env = new Hashtable(2);
env.put(JboContext.INITIAL_CONTEXT_FACTORY,JboContext.JBO_CONTEXT_FACTORY);
env.put(JboContext.DEPLOY_PLATFORM, JboContext.PLATFORM_LOCAL);
HrService am = null;
try {
InitialContext ic = new InitialContext(env);
ApplicationModuleHome home = (ApplicationModuleHome)ic.lookup(AMDefName);
am = (HrService)home.create();
String retString = am.test123();
System.out.println("Value from the first application module=" + retString);
catch (NamingException nex) { /* Handle the error here if you don't find it */
System.out.println("Naming exception " + nex);
Configuration.releaseRootApplicationModule(am, true);
return "test2";
successful
Thanks
Mike

How to detect JBO Exception from within Apps Module Custom Method ?

Hi all,
I have a custom method in apps module (AM) to set "Status" attribute to "A' in an antity, this is for approval.
Also there is a rule that the transaction cannot be approved if it is already cancelled by another user (in multi user environment).
The problem is :
If the AM custom method fail (because it throws JBOException in the entity setter method), How can I know that it fails ?
and report it back to the backing beans that call the custom method ?
Thank you for your help,
xtanto
Below is the code :
1. create a custom method in AM to do : setStatus ("A") ;
public void approve(){
ViewObject bphVo = findViewObject("BpHView1");
BpHViewRowImpl vBphViewRow = (BpHViewRowImpl)bphVo.getCurrentRow();
vBphViewRow.setStatus("A");
2. Do a validation inside setStatus method of the entity :
public void setStatus(String value) {
if (! getCancel() == true )
setAttributeInternal(STATUS, value);
else
throw new JboException("Error ! transaction already cancelled");
3. On backing beans :
public String approveButton_action() {
BindingContainer bindings = getBindings();
OperationBinding operationBinding =
bindings.getOperationBinding("approve");
Object result = operationBinding.execute();
if (!operationBinding.getErrors().isEmpty()) {
System.out.println("There is JBO Error !!");
return null;
else{
commitButton_action();
return "back";
}

Try this code:
approveButtonAction() {
String navigationString = null;
try {
Object result = operationBinding.execute();
naviagionString = success;
catch (JboException e) {
navigationString = null;
(DCBindingContainer)bc.cacheException(e);
} finally {
if(navigationString != null)
return commitButtonAction();
else
return navigationString;
}

App module view object row currency and task flows

Hello -
Using JDev 11gR1. My application uses ADF Rich Faces with ADFBC.
I have case where I want to
a. select a row in a table based on a view object
b. hit a button to invoke a method in an application module.
c. in the app mod method, call getMyViewObject().getCurrentRow() to get the row selected by the user
d. "do something" with the row
In 10.1.3, this worked fine.
In 11gR1, I am having problems:
1. The above situation works fine if I have a regular page.
HOWEVER,
2. The above situation does NOT work if my table is in a page fragment in a task flow. (The getCurrentRow() returns NULL.)
For case #2 I've checked the following:
* verified that the selectedRowKeys and selectionListener attributes were set on the table in the page
* verified that I'm using the correct app module instance (I have nested application modules).
* experimented w/various transaction and data control scope settings in the task flow definition.
So... from those details is there something obvious I am doing wrong? It looks like cases #1 and #2 above use different row set iterators. Is there a way to grab the correct row set from within my app module method? Does this have something to do with the data control scope defined by the task flow? (For 11g do I need to "rethink" sticking logic in the app module and instead placing it within a managed bean get access to my ADFBC objects via the bindings layer?)
Thank you for reading my question,
-- Scott

See this article for View Object tuning tips:
http://www.oracle.com/technology/products/jdev/tips/muench/voperftips/index.html
Are you planning to use this AM as a nested AM inside other application modules?
If you don't the "selection AM" will have its own, separate database connection/transaction.
If you do, it will share connection, transaction with its containing "root" AM.
It may not be relevant to your application, but just realize (which is explained in the article I point to above) that view objects that are not related to entity objects do not "see" pending changes in the current transaction. That feature depends on the VO/EO cooperation. It's fine to build VO's without an EO -- in fact we've made it easier to do this in 10.1.2 in the Design Time wizards -- but you just want to make sure you realize what features it's giving up. If you don't need those EO-related features, then by all means create an Expert Mode VO that's not related to EO's.

Need to Return immediately and commit the App Module on a different thread

I have an action that I want to return fast (immediately) but the server processing takes longer than acceptable. The results of the operation don't matter to the page submitting it and I want it to be able to navigate away even if the operation is not complete. I want to either be able to send a non-blocking server event from the browser or on the server side start a new thread that performs the operation allowing the original thread to return immediately. The new thread would need access to an Application Module in order to commit data. How would I go about accomplishing this?
Some thoughts
I've tried creating a ConcurrentLinkedQueue and putting the DataControl on the que, then in the other thread I pull it off the que, process and commit the data. This works unless the page is navigated away from. Then calling dc.getApplicationModule(); returns null.
I thought about using createRootApplicationModule in the new thread (since the new thread has no context) but don't know how that would work
This is the code in the run method of the new thread. In this example, I'm adding data to the app module in the original thread and committing the data in a new thread.
(like I said, it works most of the time.)
Object[] req = (Object[])que.poll();
DCDataControl dc = (DCDataControl)req[0];
try{
ApplicationModule am = dc.getApplicationModule();
if (am != null){
am.getTransaction().commit();
} else{
System.out.println("AM:null unable to commit ");
} catch (Exception e){
e.printStackTrace();
finally{
if (dc!= null){ dc.resetState();} // release app module
}

Thanks for the replies. I am aware of the inherent risks of running a separate thread within a managed container.
The use case is a performance logging operation. We have a internal web app used by a network of franchises with over 1000 users. We log response time and performances statistics to the database. When the user clicks to navigate or commit data, the response time that the user experiences is logged after the page has fully rendered either through a PPR or a full submit. This is done by submitting ADFCustomEvent from javascript on the page after rendering is complete.. The event sends up the time difference from when the user first clicked to when the page was fully rendered. This information is then merged with logged events stored on the users Session that shows the name and response time of every query that was executed during the previous request. Depending on the page this could be up to half dozen to a dozen or more queries. The logging operation as experienced by the browser is generally fast (<200ms) but sometimes can be as long as a second or more when the database gets busy. A half second is too long as makes the app appear sluggish if the user can't type or click immediately after the page has finished rendering. The logged data is aggregated so we know exactly how much of the page load was due to a slow browser/network, how much was database time, webservice call time, etc... If it's due to a slow database we can drill down and see which query is the culprit. These performance metrics are critical to operations and are charted throughout the day so we know exactly what our users are experiencing. All of our users use a custom firefox client that we control. Using this logging framework we were able to determine that upgrading to a Firefox 4.0 based client cut browser render time by more than half a second on average. We can also tell what type of hardware the user is running so can place the blame for poor performance where appropriate. We have determined that pages render considerably faster on Windows 7 than on Windows 98 with the same hardware. We are moving the logging tables off of our exadata database to a separate box to remove that load from the application database. Since we expect the other database not to perform as well we don't want it to affect the user experience, hence the need to log asynchronously. I would like to put the data on a queue and have a background daemon process read from the queue and commit to the database. I would like the daemon thread to be able to use BC components. I would prefer not to resort to using a web service because of the inherent overhead. The logging operation is not a long operation but is of high frequency so should be as streamlined as possible. The load is spread over 6 servers with 4 JVM's each (24 weblogic instances). I know it's possible to use BC components from a plain Servlet (which runs on it's own thread) so what I want is to have something like a servlet thread that loops forever processing my logging queue.
One other method I am investigating is using my own non-blocking ajax call that callls a servlet to perform the logging. I will need to pull out the timestamp contained within a client side ADF component along with the pages ctrl-state variable that is included with every ADF request as it uses this as the key to get to the data on the session. ADF really needs a non-blocking ADFCustomEvent for this type of request. (send and don't care about the response)
The client component with the server listener looks like this
<af:outputText value="#{pageFlowScope.perfClientTS}" visible="false"
id="perfClientTSField" clientComponent="true">
<af:serverListener type="logPerfData" method="#{perfLog.logPerfDataAction}"/>
</af:outputText>
The script that queues the ajax call after the page loads looks like this
AdfCustomEvent.queue(perfClientTSField, "logPerfData", {
typeId : typeId,
subTypeId : subTypeId,
responseTime1 : new String(responseTime1),
responseTime2 : new String(responseTime2),
openedVia: via
true);
I also tried calling the noResponseExpected() method on the event before queuing it but it still blocked the UI and caused an additional side effect in that the client sent two ajax requests instead of one. It somehow thought something on the client side needed to be synced with the server.
email me and I can send a doc with more details about how our performance logging framework works.
Edited by: Don Kleppinger on Mar 14, 2012 2:52 PM

What's the best practice to get App Module on Jdev 10.1.3 using Struts/ADF?

Hi,
I read Mr. Muench's post stating that the best way to execute an App. Module method is to make the method part of the client interface and then drag and drop it on a form as a button ...
In another post Muench says that a another way to get the App Module is using getDataProvider() method, I tried and found that this worked in:
// standard event handler interface
// on PageController class
public class MyFormPageController extends PageController
public void onUpdate(PageLifecycleContext ctx)
AMServImp am;
am = (AMServImpl)ctx.getBindingContext().getDefaultDataControl().getDataProvider();
am.myMethod( ... );
am.getTransaction().commit();
I really like the second option because is closer to what I used to do in 10.1.2 with an event handler receiving DataActionContex parameter. Besides, is not clear to me in the former method with the drag and drop how the form inputs are assigned to the method parameters ....
I would like to know however what is the best way and why ?
Any comments ?
-OM
Message was edited by:
omar71

According to JSR 227, which ADFm is implementing, the view/controller portions of your application aren't really supposed to be touching the business services, or even the data controls, at all. They're supposed to do all model manipulation entirely through the databindings.
This is just another bit of "code separation"--much like MVC code separation--that should make the application a bit easier to maintain. Your application module could change dramatically--maybe even be replaced by an EJB session bean--and all you have to do is change the .dcx file and your page model files, rather than searching through your code. Maintainability and readability is the advantage here; I don't think there could possibly be any slowdown by calling ctx.getBindingContext().getDefaultDataControl().getDataProvider(), since that's what the bindings would do anyway.
Well, of course there's the "ADF supports going this way declaratively", which is not to be sneezed at as an advantage.
As to how to put the form values in to the method binding: Look up the <af:setActionListener> tag (e.g., using full-text search in the help). You can nest that into your commandButton or commandLink tags and use it to set method parameters.
Best,
Avrom

Separate App Module, View Object based on Select not EO: Best practice?

Hi,
I have a list of base tables(parameters) that are used everywhere in my application for selection components (List, Combo, Radio).
I'm considering creating a separate app module with a view object based on query for each table.
I have created a BaseTableAM application module for managing those tables, Entity objects and View Objects in update mode.
Those tables are rarely changed.
Example of table:
ItemType
item_type_id = primary key
name = description
In the BasetableAM:
ItemTypeEO entity object
ItemTypeVO updateable view object based on related entity object.
Now in my project I will create combo boxes for selection of the item_type_id.
Separate application module:
SelectionViewAM composed of View Objects based on Select statements and not on Entity Objects.
Example of view object ItemTypeViewVO:
SELECT ItemType.ITEM_TYPE_ID,
ItemType.NAME
FROM ITEM_TYPE ItemType
All view objects in this application module will be read-only and for selection only.
By basing all those View Objects on select statements not based on Entity Objects I suppose there will be no locking and "value changed" management => less overhead.
Is this a good practice?
Being read-only I could have based those View Object on Entity Object with flag updateable set to no, what would you recommend?
By creating a separate Application Module for those selection view objects, I know that update will not be possible.
Thank you for your advice.
Frederic

See this article for View Object tuning tips:
http://www.oracle.com/technology/products/jdev/tips/muench/voperftips/index.html
Are you planning to use this AM as a nested AM inside other application modules?
If you don't the "selection AM" will have its own, separate database connection/transaction.
If you do, it will share connection, transaction with its containing "root" AM.
It may not be relevant to your application, but just realize (which is explained in the article I point to above) that view objects that are not related to entity objects do not "see" pending changes in the current transaction. That feature depends on the VO/EO cooperation. It's fine to build VO's without an EO -- in fact we've made it easier to do this in 10.1.2 in the Design Time wizards -- but you just want to make sure you realize what features it's giving up. If you don't need those EO-related features, then by all means create an Expert Mode VO that's not related to EO's.

Accessing an app.module's client interface methods in other app module

Hi all,
We are developing an application with number of projects (one for each module). We have got a common project with an application module, entity and view objects which are common for the entire application. For reusability, this common project is shared in session scope since most of them are of static nature.
In the shared application module's implementation class, a common method has been included that will be used for data filtering by constructing/appending where clauses in a particular application scoped view object. This method has been exposed as client interface method so that other projects can make use of it. The common project is compiled as an ADF Library jar for accessing it in other projects.
For accessing the exposed client interface method, from the view controller layer, we can include its reference in the page definition file and can execute the method from a managed bean by finding the operation binding from the page definition. But, in case if we wish to access the method in another model project, we could not do so.
Now, my questions are:
1. Is it the correct location(Shared App Mod. Impl) for including the logic to filter the data?
2. Is it possible to access the app. module impl method in another project's impl classes (Let it be entityImpl or viewObjectImpl or viewRowImpl or AppModImpl) ?
3. If it is possible, how it has to be done?
Thanks and regards,

Strange, the same question here {thread:id=2187487}
Timo
Edited by: Timo Hahn on 08.03.2011 12:02
@john You beat me agian

How do I properly pass values into an input parameter form and app module?

Using JDeveloper 11.1.1.4
I created an application module that calls a PL/SQL procedure that uses input parameters. I exposed this to the data control and dropped the object on a jsff as a input parameter form. I need to set some of the input parameters on this form from values gathered and stored in a pageFlowScope bean. What is the proper way so that the values will: 1. show on the form, and 2. get to the java code in the application module that calls my procedure? An example field from my form is:
        <af:inputText value="#{bindings.pPayerId.inputValue}" label="Payer ID"
                      required="#{bindings.pPayerId.hints.mandatory}"
                      columns="#{bindings.pPayerId.hints.displayWidth}"
                      maximumLength="#{bindings.pPayerId.hints.precision}"
                      shortDesc="#{bindings.pPayerId.hints.tooltip}" id="it8">
          <f:validator binding="#{bindings.pPayerId.validator}"/>
          <af:convertNumber groupingUsed="false" pattern="#{bindings.pPayerId.format}"/>
        </af:inputText>Thanks,
Troy

Thanks Shay for pointing me in that direction.
I didn't find the NDValue in the bindings, so I went to the pagedef xml and found it there. Changing the NDValue successfully delivered the value to the app module when the method was executed, but didn't show the value on the form. I had to add the same #{pageFlowScope.paramsBean.fileFormatParam} to the value of the input field and it now is working as needed.

Transaction control of app module implementation , from a SLSB

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