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Articles : J2EE Deployment Specification :

Deployment Configuration:


Each application server is different and needs different configuration data to deploy, configure and run applications. The deployment configuration data helps in deploying and configuring a J2EE application on the specified application sever and the specified target platform it is intended for. This job is done with the help of components called deployment configuration components. These components are the bridges between the tool provider and the product provider. The components are designed as JavaBeans and need to adhere to the JavaBean API specifications version 1.01. There are two components needed for successful deployment and configuration, they are the Deployment configuration beans and the Deployment descriptor beans.

Deployment Configuration Beans:


Deployment configuration beans or config beans present to the deployer the external dependencies that the application might have. They are simple JavaBeans that allow deployment information to be displayed as property sheets using a standard Java editor. The J2EE provider provides the configuration data for these properties in the Javabean. If no values are provided default values are assumed. A config bean presents to a deployer a logical grouping of deployment configuration information. Config beans are represented as tree structures, the root of which is a DConfigBeanRoot element. The nodes of the tree are DConfigBean objects. A DConfigBean object is a bean used for configuring a vendor specific deployment descriptor or a subset of one. The DConfigBean has a number of methods which can be used to configure deployment descriptors. I've listed a couple below:

  • getDConfigBean() gets the specific DConfigBean for a subset of the given bean,
  • getDDBean() gets the DBean that holds the actual physical deployment descriptor that this DConfigBean is trying to configure. A few other methods to get Xpath information and property change listeners are also present.

All the DConfigBeans and their subsets are together grouped into a DeploymentConfiguration object. An application(s) may have multiple modules each of which may have their own deployment descriptors and DConfigBeans. The DeploymentConfiguration object which has all these DConfigBeans creates the deployment plan for the application.

Deployment Descriptor Beans:


The Deployment descriptor beans or DD Beans are the components used to read the data into a config bean based on the Xpath string supplied. They read and extract the data from the application's actual deployment descriptor files and store them in the config beans. A DD bean can have multiple child DD beans.

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