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Wednesday, April 9, 2008

SCA Java EE Integration Specification Version 0.9

On March 28, 2008 Version 0.9 of the SCA "Java EE Integration
Specification" was published by OSOA authors as part of the SCA
Service Component Architecture; contributors include BEA, Cape Clear,
IBM, Interface21, IONA, Oracle, Primeton, Progress Software, Red Hat,
Rogue Wave, SAP, Siemens, Software AG., Sun, Sybase, and TIBCO. The
specification defines a model of using SCA assembly in the context of
a Java EE runtime that enables integration with Java EE technologies
on a fine-grained component level as well as use of Java EE applications
and modules in a coarse-grained large system approach. The Java EE
specifications define various programming models that result in
application components, such as Enterprise Java Beans (EJB) and Web
applications that are packaged in modules and that are assembled to
enterprise applications using a Java Naming and Directory Interface
(JNDI) based system of component level references and component naming.
Names of Java EE components are scoped to the application package
(including single module application packages), while references, such
as EJB references and resource references, are scoped to the component
and bound in the Environment Naming Context (ENC). In order to reflect
and extend this model with SCA assembly, this specification introduces
the concept of the Application Composite and a number of implementation
types, such as the EJB implementation type and the Web implementation
type, that represent the most common Java EE component types.
Implementation types for Java EE components associate those component
implementations with SCA service components and their configuration,
consisting of SCA wiring and component properties as well as an assembly
scope (i.e. a composite). Note that the use of these implementation
types does not create new component instances as far as Java EE is
concerned. Section 3.1 explains this in more detail. In terms of
packaging and deployment this specification supports the use of a Java
EE application package as an SCA contribution, adding SCA's domain
metaphor to regular Java EE packaging and deployment. In addition, the
JEE implementation type provides a means for larger scale assembly of
contributions in which a Java EE application forms an integrated part
of a larger assembly context and where it is viewed as an implementation
artifact that may be deployed several times with different component

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