Introduction to Application module

1.AM encapsulate the view object instances and business service methods necessary to perform a unit of work.

2.Each application module has its own transactional context and holds its own database connection. This means that all of the work a user performs using view objects from one application module is part of one database transaction.

3.Application modules can have different granularity, but typically, you will have

one application module for each major piece of functionality.

4.If you wish, you can combine multiple application modules inside one root application

module. This is called nesting and allows several application modules to participate in the transaction of the root application module.

This also saves database connections because only the root application module needs a connection.

5. When a root application module contains other nested application modules, they all participate in the root application module's transaction and share the same database connection and a single set of entity caches. This sharing is handled for you automatically by the root application module and its Transaction object.

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The file store "WLS_DIAGNOSTICS" could not be opened

WLS_DIAGNOSTIC ERROR weblogic.store.PersistentStoreException: [Store:280073]The file store "WLS_DIAGNOSTICS" could not be opened because it contained a file with the invalid version 1. A file of version 2 was expected. When you get this error while running your application on internal weblogic server delete the following file WLS_DIAGNOSTICS000000.DAT search the file in following path C:\jdev_work\system11.1.1.5.37.60.13\DefaultDomain this file is in DefaultDomain folder of your jdev. and delete the WLS_DIAGNOSTICS000000.DAT file . and run your applicatuon

Passivation and Activation in ADF (Application Module )

1. For performance reasons, ADF keeps a pool of application modules in memory. It tries to give each session the same application module as the session used during the last request; however, this might not be possible during peak load of your application. 2. In this case, ADF saves the application modules state in a database table so the application module can be used by another session. This is called passivation . 3. When the first session needs the application module again, its state is retrieved from the database process known as activation . 4. If you have made an error in your code and depend on some variable that is not persisted correctly when your application module state is stored, you will experience mysterious errors under high load. Enable/Disable Application Module Pooling : Right-click on your application module, choose Configurations.By default, each application module has two configurations. Ensure that the one ending in …Local is selected and then c...

Overview Editor for bc4j.xcfg

This is used to customize the configuration settings for the application pool, connection pool, and transactions. Select the Application Module, then select a configuration from the Configurations list. You can specify a Default Configuration from the dropdown to use with selected application module. Edit the name of the configuration in Details. Its having 3 tabs 1.Database and Scalability 2. Properties 3. Custom Properties Database and Scalability Tab : In Database and Scalability you can mention the JDBC data source definition for each application module. You can choose to connect to a JDBC data source or to a JDBC URL.The default connection type is the default data source. A data source is a vendor-independent encapsulation of a database server connection on the application server. 1. Data sources ( JNDI name) offer advantages over a JDBC URL connection because the data source can be tuned, reconfigured, or remapped without changing the deployed application. 2. JDB...

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