J2ee architecture

You'd have to be living in a vacuum not to be aware of the debate that rages between proponents of the two dominant development platform contenders: Java 2 Enterprise Edition and .Net. Many articles have been written declaring one or the other the winner based upon performance, scalability, features, portability, vendor independence, ease of use, lines of code, robust security, productivity tools and enterprise connectivity, just to name a few of the hot issues. The tale of the tape is long and confusing, but does it really get at the heart of the issue? You Say Potato, I Say ... Much of the debate has sought to differentiate the two in order to convince customers that one is the clear and obvious choice. The most obvious conclusion seems to be that the architects are most skilled at conceptually copying and enhancing the best of one another's platforms. As a result, J2EE and the .Net Framework are far more similar than many people realize and will probably become even more so in the future. Sun Microsystems started things off when it made the Java language syntactically similar to C/C++, but improved it by making it object-oriented from the ground up, by adding its own features and by employing common design patterns in the Java Development Kit (JDK). Not to be outdone, Microsoft made its own improvements with .Net and the Common Language Runtime to enable code that's written in many languages but deploys as if written in one. Microsoft embraced object-oriented programmin...

J2EE Platform Overview The Application Server implements J2EE Applications J2EE The following figure illustrates the components of the J2EE platform discussed in the following sections. Sorry: the graphics are not currently available. Containers J2EE Services The J2EE platform provides • Naming - A naming and directory service binds objects to names. A J2EE application can locate an object by looking up its • Security - The • Transaction management - A • Message Service - Applications hosted on separate systems can communicate with each other by exchanging messages using the Web Services Clients can access a J2EE 1.4 application as a remote web service in addition to accessing it through HTTP, RMI/IIOP, and JMS. Web services are implemented using the Client Access Rich client applications running in the Application Client Container can directly lookup and access Enterprise JavaBeans using an Clients that conform to the The best access mechanism depends on the specific application and the anticipated volume of traffic. The Application Server supports separately configurable listeners for HTTP, HTTPS, JMS, IIOP, and IIOP/SSL. You can set up multiple listeners for each protocol for increased scalability and reliability. J2EE applications can also act as clients of J2EE components such as Enterprise JavaBeans modules deployed on other servers, and can use any of these access mechanisms. External Systems and Resources On the J2EE platform, an external system is called a resourc...

The Containers run on existing systems: web servers for the web containers, application servers, transaction processing (TP) monitors, and database systems for EJB containers. This enables enterprises to leverage both the advantages of their existing systems and those with J2EE technology. Enterprises can write (or rewrite) new applications using J2EE capabilities and can also encapsulate parts of existing applications with Enterprise JavaBeans (EJB ) or JavaServer Pages (JSP ) technologies. Enterprise applications access functions and data associated with applications running on EISs. Application servers extend their containers and support connectivity to heterogeneous EISs. Enterprise tools and Enterprise Application Integration (EAI) vendors add value by providing tools and frameworks to simplify the EIS integration task. J2EE Connector Overview The J2EE Connector architecture defines a standard architecture for connecting the J2EE platform to heterogeneous EISs. Examples of EISs include ERP, mainframe transaction processing, database systems, and legacy applications not written in the Java programming language. By defining a a set of scalable, secure, and transactional mechanisms, the J2EE Connector architecture enables the integration of EISs with application servers and enterprise applications. The J2EE Connector architecture enables an EIS vendor to provide a standard resource adapter for its EIS. The resource adapter plugs into an application server, providing conn...

This architecture is for a relatively simple website that uses a J2EE-compliant application server. The diagram shows one new database in the Middle Tier of a website and no existing databases or systems in the EIS Tier. There are four ways that a database could be used in this architecture: • The first way is with a transparent interface such as Java Data Objects (JDO) coupled with an object database. In this case, there is no need for a mapping layer because the Java object model is the same model used by the object database. See J2EE Website Architecture JDO Middle Tier • The second way is with a transparent interface such as Java Data Objects (JDO) coupled with a relational database. In this case, there is a need for a mapping layer because the Java object model may not match the model used by the relational database. Nevertheless, the mapping can be moved to one location as described in • The third way is with a call-level interface such as JDBC coupled with a relational database. In this case, there is a need for a mapping layer because the Java object model may not match the model used by the relational database. The mapping would need to be done at the application level as described in • The fourth way is with SQLJ and a relational database. Having a new database would make it possible to minimize the mapping described in Context for J2EE Website Architecture Web Services, Service-Oriented Architectures, and Cloud Computing: The Savvy Manager's Guide ( Second Editi...

This article relies excessively on Please improve this article by adding Find sources: · · · · ( January 2012) ( ( Jakarta Connectors ( JCA; formerly Java EE Connector Architecture and J2EE Connector Architecture) is a JCA and Java EE [ ] J2EE Version 1.4 requires application servers to support JCA Version 1.5. Contracts [ ] The Jakarta Connector Architecture defines a standard for connecting a compliant application server to an EIS. It defines a standard set of system-level contracts between the Jakarta EE application server and a resource adapter. The system contracts defined by Version 1.0 of the J2EE Connector Architecture are described by the specification as follows: Connection management Connection management enables an application server to Transaction management Transaction management enables an application server to use a Security management Security management reduces security threats to the EIS and protects valuable information resources managed by the EIS. JCA Version 1.5 adds system contracts to the specification as follows: Life cycle management Life cycle management enables an application server to manage the life cycle of a resource adapter from initiation through upgrades to obsolescence. This contract provides a mechanism for the application server to bootstrap a resource adapter instance during its deployment or application server startup, and to notify the resource adapter instance during its withdrawal or during an orderly shutdown. Work management Wo...

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Chapter 2 Java Enterprise System Architecture Sun Java Enterprise System 2004Q2 Technical Overview Chapter 2 This chapter provides an overview of the architectural concepts upon which Java Enterprise System deployments are based. The chapter describes a framework in which Java Enterprise System deployment architecture s is analyzed along three dimensions: logical tiers, infrastructure service levels, and quality of service. These three dimensions, shown schematically as orthogonal axes in the following figure, help to clarify the architectural functions of Java Enterprise System components. The three-dimensional framework is key to designing successful deployment architectures for business software solutions. Figure2-1Three Dimensions of Java Enterprise System Architectural Framework • Dimension 1: Logical Tiers The standard architecture for distributed applications separates application logic into a number of tiers. These tiers signify a logical and physical organization of components into an ordered chain of service providers and consumers. Components within a tier typically consume the services provided by components in an adjacent provider tier and provide services to one or more components in an adjacent consumer tier. The logical tier dimension of deployment architecture is illustrated in the following figure. Figure2-2Dimension 1: Logical Tiers for Distributed Enterprise Applications Description of Logical Tiers This section provides brief descriptions of the four l...