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IBM Cloud Authors: Yeshim Deniz, Zakia Bouachraoui, Liz McMillan, Elizabeth White, Pat Romanski

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Java IoT: Article

Part 3 | Component Models in Java

Service Component Architecture Model

Following table summarizes the various features provided by the component models discussed in this article.

Features

EJB

Spring

OSGi

SCA

Standard

Yes

Yes

Yes

Yes

Component Interface

Plain Old Java Interface

(Business Interface)

 

Plain Old Java Interface

 

Plain Old Java Interface

(Service Contract)

Component Implementation

Plain Old Java Object

Plain Old Java Object

Plain Old Java Object

Plain Old Java Object

XML configuration file

ejb-jar.xml (optional, used in earlier versions)

Beans.xml

Manifest.mf

component.xml

xxx.composite

Runtime environment

EJB Container

Spring Container

OSGi Framework

SCA Domain

Annotation support

Supported

Supported

Supported

Supported

Registry

Available - EJB Container

Available - Spring Container

OSGi Service Registry

SCA Domain

Dependency Injection

Supported

Supported

Supported

Supported

Modularity

Partial support

Partial support

Complete support

Partial support

Aspect Oriented Programming

Supported

Supported

Not Supported

Not Supported

 

 

API

EJB API

Spring API

OSGi API

SCA API Implementations

Packaging

Jar file

Jar file

Jar file with Manifest metadata(Bundle)

Composite

Assembly

Using Jar

Using Jar

Using Bundles (Runtime assembly is possible)

Using composites

Component Reference

Using @EJB or  JNDI look up in the container

Using Beans.xml and bean id in the container

Using ComponentContext, ServiceReference APIs and OSGi Registry

Using the service address in the composite

Language

Java

Java

Java

Java, C++, BPEL, Ruby, Python...

References

  1. EJB 3.0 specification - http://jcp.org/en/jsr/detail?id=220
  2. EJB 3.0 Technology - http://www.oracle.com/technetwork/java/javaee/ejb-jsp-138626.html
  3. Spring - http://www.springsource.org/
  4. Spring framework - http://www.springsource.org/spring-framework
  5. Spring documentation - http://www.springsource.org/documentation
  6. OSGi - http://www.osgi.org/Main/HomePage
  7. Eclipse OSGi - http://www.eclipse.org/osgi/
  8. Component Development and Assembly using OSGi - http://java.sys-con.com/node/2146647
  9. SCA - http://www.oasis-opencsa.org/sca
  10. Apache Tuscany - http://tuscany.apache.org/

Acknowledgements
The authors would like to sincerely thank Anupama Nithyanand and Sarma KVRS for their support.

More Stories By Piram Manickam

Piram Manickam works at Infosys Limited. He would like to acknowledge and thank Sangeetha S, a beloved colleague and friend, for her invaluable contributions in this work.

More Stories By Subrahmanya SV

Subrahmanya SV works at Infosys Limited. He would like to acknowledge and thank Sangeetha S, a beloved colleague and friend, for her invaluable contributions in this work.

More Stories By S Sangeetha

S Sangeetha is a Senior Technical Architect at the E-Commerce Research Labs at Infosys Limited. She has over 15 years of experience in architecture, design and development of enterprise Java applications. She is also involved in enhancing the technical skills of Architects at Infosys. She has co-authored a book on ‘J2EE Architecture’ and also has written numerous articles on Java for various online Java forums like JavaWorld, java.net, DevX.com and internet.com. She can be reached at sangeethas@infosys.com.

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