ADF Application Module cache

All,
I'm getting some value form the View Object and displaying it on screen, in case of failure result, I have a go back link, which helps the me to query again.
In second try when I enter the right value, it some how fetches the result for the previous input (first try value). Looks like it is fetching the values form the cache. I tried to
run a viewobject.cache() and binding.refresh() but still I have the same problem. Can some one hlep me?
Thanks,
Jai.
Edited by: sjai on Sep 3, 2009 10:40 AM

I have a login page which authenticate the user, in case of authentication failure, I have a go back link, I
click this and go back to the originating page, now, when I pass the correct credentials, it fails to take the correct value, it finds my
previous entry and tries to use that.
-Jai.

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Defining bc4j.xcfg for Webservice from ADF Application Module

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I've already posted my previous question in JBO30003 while executing ADF Application Module WebService
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   xmlns="http://xmlns.oracle.com/adfm/application"
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Hi,
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JBO30003 while executing ADF Application Module WebService

Hi all,
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2. include wsdl file for my JAR file
3. deploy to AS with Enterprise Manager
The WS End Points can be access from http browser. All of methods are accessible. But when I'm invoking any random method, the result is always like this:
<?xml version='1.0' encoding='UTF-8'?>
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<SOAP-ENV:Body>
<SOAP-ENV:Fault>
<faultcode>SOAP-ENV:Server.Exception:</faultcode>
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i'm googling the error message JBO-30003, but none of them fits my problem. Any help and suggestions are appreciated. Thanks...
:)

i notice that there is file Webservice.deploy. What is it for? I assume that file is used by some kind of proccess of JDev to deploy EAR file.If it is a compulsory file, how to convert it to ANT build file?
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Having searched in oracle, i found examples are using JDev 10.1.3 which is completely different with my JDev 10.1.2 (build 1913). I cant follow that tutorial. Any one know how to deal with this issues?
Thanks

How-To Access ADF application module with ADF faces

Sorry for the repost but I don't get answer in the other Thread.
If you look in this little demo you see that you get the DCBindingContainer bc = getBindingContainer(); initialization, but my method getBindingContainer(); gives back null.
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I work with JDeveloper 1013
Greetings Thijs

Steve Muench made an example of that on his blog, here is the url for the source download: http://otn.oracle.com/products/jdev/tips/muench/accessbindingsinbackingbean/AccessAppModuleInBackingBean.zip
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ADF panel executes all queries in the application module.

Hi all,
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Hi,
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When the application module starts the trans?

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Hui

Thx, Tim.
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3rd party payment integration with ADF application

Hi ADF experts,
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I am not happy with this solution, even though it works in our test environment. I would prefer a complete ADF soultion rather than using servelts/jsps.
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Jdev used: 11.1.1.1.5
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Timo

ADF Appication Module uses RMI or not?

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Hi,
the databinding meta data is not synchronized with ADF BC or any other business service. If e.g you used EJB session beans and changed the method signature of a method used in teh View through ADF, then this is not automatically refactored.
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Using Application Module outside ADF Application context

I am trying to run application module using a standalone java class. Trying to use Application Module outside ADF Application context.
I have created a jar file on my standalone java class, and added my ADF application jar files to the classpath while running my standalone java file as a Jar file.
I could connect to the application module and I am able to get the response from my application module.
Below is the code I used to invoke my application module method from my standalone java class.
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             mbApplicationModule.getTransaction().connect(jdbcURL, "HR", "HR");
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             // TODO: Add catch code
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{code}
I am getting following messages.
{code: warning}
oracle.adf.share.ADFContext getCurrent
WARNING: Automatically initializing a DefaultContext for getCurrent.
Caller should ensure that a DefaultContext is proper for this use.
Memory leaks and/or unexpected behaviour may occur if the automatic initialization is performed improperly.
This message may be avoided by performing initADFContext before using getCurrent().
To see the stack trace for thread that is initializing this, set the logging level of oracle.adf.share.ADFContext to FINEST
Dec 14, 2012 10:16:37 PM oracle.security.jps.internal.config.xml.XmlConfigurationFactory initDefaultConfiguration
SEVERE: java.io.FileNotFoundException: D:\satya\testPackage\.\config\jps-config.xml (The system cannot find the path specified)
{code}
I have another question regarding connecting to database.
How to get connection from a datasource, to avoid supplying database credentials which will vary from one environment to another.
Please let me know if any one has pointers.
Thanks in advance.
Regards,
Satya
Edited by: 921138 on Dec 14, 2012 9:20 AM

Thanks Shay for your response.
When I run the standalone java class from jDeveloper 11.1.1.5.0, I am able to get application module and also able to get the out put from application module method. While running the java class jdev is exectung the class with javaw command. I tried to execute the same from commnd prompt, it didn't print anything on the command prompt. So I tried to execute java command with "java followed by class path" as below.
set JAVA_HOME=C:\Oracle\Middleware\jdk160_24\jre
set PATH=%JAVA_HOME%\bin;%PATH%
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{code}
I got the same old error.
Regards,
Satya

ADF application integrating with Oracle Web Cache

Hello,
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ADF BC 组件的运行时介绍 -1 Application Module的状态管理

原文连接 [ADF BC 组件的运行时介绍 -1 Application Module的状态管理|http://blog.csdn.net/genexujin/article/details/7086679]
ADF BC 框架中提供了开箱即用的应用‘状态管理’的功能。所谓状态管理，英文就是State Management，指的是维护用户在使用应用系统时的会话状态。概念上可能会和Http Session对象混淆。ADF BC提供状态管理是独立于Http Session机制的，自成体系的一个机制。
状态管理基本概念
首先来说，为什么需要状态管理？在一个应用被用户使用过程中，每个用户会有很多不需要立即存放到数据库中的信息，比如说一个购物车中的商品，一笔未完成录入的订单，一个查询输入的参数等等，这些信息只有在最后确定后才会提交到数据库事务处理。
然而，做过web应用开发的童鞋应该都很清楚，我们天天玩的这个HTTP 协议是一个无状态的协议，它不会和服务器保持一个连接，因此也无法在协议层来提供对连接状态的维持机制。因此，开发人员为了维持用户使用系统过程中的状态，就需要通过其他方式来实现。最常见的就是利用浏览器的cookie，其机制如下：
在一个新的http 请求发送到服务器时，服务器会查看http包中的头部信息是否包含cookie信息，如果没有则认为该用户request是一个全新的会话开始。服务器会在返回结果response中写入该服务器所在domain的一个cookie。Cookie里面会有一个字符串来唯一的标示一个用户的会话（浏览器窗口）。Server端会根据这个字符串token，来将系统状态信息唯一对应到一个HttpSession对象中（JEE Container）。HttpSession对象中存放的数据是一个个key/value对，应用可以将在一个会话期间保留的状态信息都会存放在该对象中。这是JEE标准的容器都会应用的一种模式。这种模式在需要高可用性的情况下，就需要在服务器之间传递Session对象，以保证Session不会因为一台服务器故障而丢失。在网络上传递Session对象需要将Session序列化，并且要求Session包含的对象也都是可序列化的。同时，频繁的Session对象更新会增加很大的网络流量，降低系统的整体性能。当然，最近版本的Weblogic服务器已经提供了对Coherence的支持，可以通过Coherence数据网格来维护Session在一个集群中的高可用性。
ADF的状态管理和HttpSession有何不同
通常，我们在HttpSession中存放的是业务数据。在一个充分设计分层的架构下，通常存放的是一些POJO对象。这些POJO不会记录底层数据访问层的状态（比如：一个查询的条件，查询结果的当前的游标位置，查询返回的结果集等等）。这些技术类的状态，在一般的架构下，是不会作为系统的状态来进行管理的并存放在HttpSession中的。ADF BC实现了一套独特的数据访问层的状态管理，可以使一个用户Session的多次请求都使用相同的Application Module的实例及其保持的状态来进行数据访问。从而，提高了数据访问的性能。当然，提高性能是相对其本身没有这套机制而言的，并非和其他持久化框架做比较。可以讲，如果ADF BC没有这样的机制会大大降低其运行的效率。
ADF BC状态管理原理。
原理上ADF BC对AM的管理如下图所示：
AM池默认情况下，ADF的运行时会维护一个或者一些AM的实例池，每一个根节点的AM都会有一个独立的池。如果有新的用户访问，ADF框架运行时会从AM池中返回一个实例给当前线程中的Data Control。Data Control的实例会被一个ADF Binding Context实例所引用，该ADFBinding Context则会保存在HttpSession中。保存在HttpSession中的这些对象，都是轻量级的对象，占用很少的内存不会造成大的性能的影响。同时，AM的实例池会维护每个session cookie token和AM实例之间的关系。
重复使用AM实例当下次有相同用户的request来的时候，会从AM池中返回上次其使用的AM实例以及相关的状态（Entity对象，View对象的缓冲，View对象的查询条件，绑定的参数等信息）。如此，避免了重新建立AM状态的开销。
Passiviation/Acitvation在一个高并发的场景下，AM池可能不得不将以及标签为有用户使用的AM实例提供给新的用户request，每个AM实例可能无法每次都能够等到上次服务的用户request（一般来说我们不会将AM的池设置为和最高并发数一样多，可能是最高并发数的20%）。在这样情况下，AM就会将其状态passivate到一个数据表中。这些状态信息会以一个XML的形式存放。通常在ADF的应用schema下会发现这样的一个表：PS_TXN。可以设定一些数据JOB来定期清理其中的数据。当原来的用户再次访问时，AM池就会将原来AM实例的passivation的数据从数据库中读回并装载到一个AM实例，这个过程称为Activation。通过这种方式，实现了AM的状态恢复。
在集群环境下我们会将jbo.dofailover参数设为true。这样为了保证AM状态的高可用性，在每次request结束时都会将AM状态做passivation。
稍微总结下：
AM实例可能的状态：
buzy: 被一个user request使用中。
referenced: AM的状态被维护中，等待下次相同的用户request。也可以被任何其他request使用，如果必须的话。
unreferenced: AM在pool中，可以被任何request使用。
AM状态管理的持久化方式：
Passivation = EO/VO的Snapshot被存放到数据库中。
Recycle = reset:实例的状态被消除，并准备服务一个新的client
Activation=将EO/VO的数据从数据库读回到AM。
在HA模式下passivation在每次request结束时进行，但recycle/activation并不会在每次request开始就进行。只有当服务器负载要求一个实例为新的客户端服务时才进行。换句话说，每次做passivation 并不会马上对AM坐recycle。Recycle只有在需要的时候才会进行。在非HA模式下，passivation会在负载需要的时候进行，并且紧接着会进行recycle和acivation。
默认情况下，每个AM都会hold住J 一个数据库的连接，直到这个AM被destroy。因此在进行数据库连接池的配置时要确保每个AM会有足够的连接可用，因为默认情况下AM拿到连接后不会在每次request结束时释放的。ADF BC也提供了参数来改变这一默认行为，具体配置方式请参考开发手册，以后有空的时候也会继续总结。

好文章，可以考虑在OTN上正式发表。

ADF & Spring: Application Module

Hi!
Im testing a mix of ADF and Spring.
I create an Bean in the Spring Context that is an ApplicationModule
<bean id="myAM" class="oracle.jbo.client.Configuration" factory-method="createRootApplicationModule">
<constructor-arg><value>mypkg.myAM</value></constructor-arg>
<constructor-arg><value>MyAMLocal</value></constructor-arg>
</bean>
Testing the application it works fine.
But I want more and i wish the ADF takes this instance of MyApp and avoid a new instantiation of it. (Now i have 2 instances of MyApp, one created by Spring and another created by ADF)
Theres some way to say ADF to take an existing instance to put it in the session or somethig?
Thank you!!

OK the question is Why??
Seriously though - you can create a data control that exposes Spring artifacts through the Data Control palette which would seem to be the more normal way around. Do you need the Application Module to inject it into some other Spring Artifact?

Use of application module pool and ADF Busines Components

Hi to all;
Lets suppose an web application with about 10 CRUD forms and 15 to 20 reports or forms just to query and show data;
That's clear to me, all the advantages of using App modules pool.
But for that reports ..... Just an Read only and Forward Only data ?
I was wondering, if it will be more effective and lightweight if we just take an JNDI JDBC connection query data and show it.
This imaginary application will make use of application module pool to provide that 10 CRUD web forms and in other hand, will have for reports,JNDI data sources;
What are your opinion about having this two architectural approach working together in one application ?
Very thanks;
Marcos Ortega
Brazil;

Hi Deepak;
BC4J in my opinion is great and i am proud to share this opinion with all of you;
As a meter of fact, i post this thread to help me better understand BC4J architecture.
I think that my doubt main point is ...
Are application modules pool's life cycle an extra work , when the job is just to read and show data ?
Perhaps, an document about statefull and/or stateless application service release, help me;
IMHO;
cached data most of the time must to be discarted for reports, always we want to query database directly, View's object ClearCache() method would be called to reports.
I think that it's different, when we are talking about sequent requests when we need to span the session, views and entities states.
Forwards Thanks;

ADF BC: Optimal Application Module Runtime Configuration

Have implemented an intranet application for 1000 users using the following technologies implemented on Oracle JDeveloper 10.1.3.0.4:
ADF BC for my Services layer
JSF for my Controller layer
JSF and ADF for my View layer
ADF Model for my Data layer
The application is entirely designed by .jspx and .jsp pages (for reports), handling 106 application modules, with several entity and view objects and without any step-by-step stateful scenario. At each page, there appears a commit button to commit the end-user transaction, and a rollback button to return to the previous page.
The application is database-backed from an Oracle Database 10g, deployed on three application servers Oracle 10.1.3.1 on three different hosts on Suse Linux OS, used data-source connection and AM pooling, and load-balanced by one webcacher in front of the 3 servers.
Under stress test scenario, on a heavy system load in production environment, several ADF State Management errors were recognized that pushed the webacher and application server with the maximum load to automatic restarts due to either demand for JVM increased heap size or errors from the database that the TNS listener complained it could not handle any more connections.
Thus, we started a safety/reliability tess for all our application module components (disabling "Enable application module pooling"), and a stress test using a third-party stress tool at work, but we're still faced with several questions.
(a) What is the best strategy for AM configuration, to quit State Management at all since our application doesn't need it, and if so can it be done globally or declaratively and not individually and programmatically?
(b) Testing on application module runtime configuration, we observed that not to "hang-on" on a connection -default functionality- but to release it at the end of each HTTP request, as each deployment is concentrated on a single data-source connection pool/single user, brought less open JDBC connections on A.S.? Is this the optimal run-time configuration than the default for our case?
(c) If State Management errors are resolved, and using a software balancer before 3 application servers, regulate the traffice by 1/3 to each, is it possible that a system crash will be avoided next time?
So, our problems related to ADF tunning and State Management Errors, but we need a good advice on this topic as the overall documentation is case-specific.

Chapter 29 "Understanding Application Module Pooling" in the ADF Developer's Guide for Forms/4GL Developers on the ADF Learning Center at http://www.oracle.com/technology/products/adf/learnadf.html is the best place to start. There is no "magic" optimal configuration that I (or anyone here, really) can suggest to you. You need to understand the various "knobs and dials" that control the pool sizing and pool cleanup behavior, and then apply application-specific information to this information to derive what the optimal configuration for your particular application will be. The chapter explains how the application module pool and database connection pool interact, and in which situations it is best to change the default setting of the jbo.doconnectionpooling property to true.
Chapter 28 "Application Module State Management" describes the functionality of that facility of the framework, as well as how to release the application module in stateless, unmanaged mode if you need to.
By following the tips in the section "28.3.2.4 Setting Release Level in an Custom ADF PageLifecycle" (which builds on information introduced in section "10.5.4.1 Globally Customizing the ADF Page Lifecycle"), you can generically impose a different release level in your application without "touching" every page.
As a general rule, if you have:
(*) Lots of distinct application modules
(*) Each of which is used as a separate data control (rather than being nested inside a containing application module as described in section "8.9.3 Root Application Modules Versus Nested Application Module Usages" of the dev guide)
(*) Each of which uses the same database connection
Then as described in section "29.8 How Database and Application Module Pools Cooperate" in the guide, your application can decrease the total overall number of connections used by using the non-default setting of jbo.doconnectionpooling=true.
Applications using many distinct data controls in the span of a single user's session need to be aware of Bug# 4566186 ("PERF: ADFBINDINGFILTER CHECKS OUT ALL ADF BC DATA CONTROLS USED AT LEAST ONCE"). This issue has been fixed in JDev/ADF 11g, but apparently the fix was too complex to accommodate a 10.1.X backport. I'm trying to document a workaround and publish it on my blog, but I'm not finished with it yet.

Coding custom business methods in ADF BC Application Module ?

Dear All,
Where do i put my custom business methods in ADF BC Application Module ?
Can anyone point me to a good tutorial which gives a good insight into developing ADF BC Applications ?
Thanks,
Raghavendra

Hi,
there will be a developer guide out soon. Its written by Steve Muench and provides an indepth walk-through ADF BC.
To answer your question, custom code is written in Java files on the ApplicationModule, ViewObject and EntityObject level. If you go to the Editor of each of these components there is an option for you to create Impl.java and RowImpl.java files. The first is for generic business logic, the latter for row based logic
Frank

ADF Application Module cache

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