Creating an Enterprise Application

Porting EJBs from Other J2EE Application Servers

Any EJB that complies with the EJB 1.1 or EJB 2.0 specifications may be deployed in the WebLogic Server 7.0 EJB container. Each EJB JAR file requires an ejb-jar.xmlfile, a weblogic-ejb-jar.xmldeployment descriptor, and a CMP deployment descriptor if CMP entity beans are used. The WebLogic Server EJB examples located

in samples\examples\ejb11 and samples\examples\ejb20 of the WebLogic Server distribution include sample weblogic deployment descriptors.

Creating an Enterprise Application

An Enterprise Application is a JAR file with an EAR extension. An EAR file contains all of the JAR and WAR component archive files for an application and an XML descriptor that describes the bundled components. The META-INF\application.xmldeployment descriptor contains an entry for each Web and EJB module, and additional entries to describe security roles and application resources such as databases.

EnterpriseApplicationStagingDirectory\

+ .jar files

+ .war files

+META-INF\-+

+ application.xml

To create an EAR file:

1.Assemble all of the WAR and JAR files for your application.

2.Copy the WAR and EJB JAR files into the staging directory and then create a META-INF\application.xmldeployment descriptor for the application. Follow the directory structure depicted above.

The application.xml file contains a descriptor for each component in the application, using a DTD supplied by Sun Microsystems. For more information on the application.xml file, see Application Deployment Descriptor Elements in

BEA WebLogic Server 7.0 Upgrade Guide

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BEA 7 manual Creating an Enterprise Application, Porting EJBs from Other J2EE Application Servers

7 specifications

BEA 7, a significant product from BEA Systems, represents a cornerstone in enterprise application integration and service-oriented architecture. As a comprehensive solution for developing, deploying, and maintaining enterprise-level applications, it brings a host of features that cater to the needs of businesses seeking agility and reliability in their IT infrastructure.

One of the standout characteristics of BEA 7 is its robust support for service-oriented architecture (SOA). This enables businesses to create applications as loosely coupled services, facilitating easier integration and scalability. The platform's emphasis on middleware technologies allows organizations to streamline their IT operations, enhance interoperability, and reduce time to market for new applications.

BEA 7 includes a powerful application server that provides a reliable runtime environment for managing applications. Offering high availability and scalability, it can successfully handle the demands of high-volume transactions while ensuring optimal performance. The built-in clustering capability ensures that applications can remain operational even in the event of server failures, which is critical for mission-critical applications.

Another notable feature of BEA 7 is its capabilities for web services. With support for industry standards such as XML, SOAP, and WSDL, users can easily expose and consume services across diverse platforms. This allows businesses to take full advantage of an interconnected ecosystem and simplifies the process of integrating various applications and data sources.

Security is a paramount consideration in BEA 7, which includes strong authentication, authorization, and encryption mechanisms to protect sensitive data. The platform's comprehensive security features ensure compliance with regulatory requirements and protect against potential threats, which is particularly important for sectors handling sensitive information, such as finance and healthcare.

BEA 7 also embraces innovative technologies such as the Java EE platform, facilitating the development of cross-platform applications. The integrated development environment (IDE) offers numerous tools for developers, making it easier to design, debug, and deploy applications. Developers benefit from built-in support for commonly used frameworks and libraries, improving productivity and enabling rapid application development.

In summary, BEA 7 stands out as a powerful enterprise solution, distinguished by its support for SOA, robust application server capabilities, web services integration, strong security features, and a developer-friendly environment. These attributes make BEA 7 an essential tool for organizations aiming to enhance their operational efficiency and adapt to the increasingly dynamic business landscape.