Bottom-up web service development components

Important participants in a bottom up SOAP based web service implementation are:

• Service Endpoint Interface (SEI) 

• Service Implementation Bean (SIB)  

• Any publisher.

SEI and SIB

• Service Endpoint Interface (SEI) is an interface that declares the web service operations as its methods.

• Service implementation Bean (SIB) is the implementation class of the SEI.

• A SOAP – based web service could be implemented as a single java class, 

  • But best practice is to have an interface (SEI) that declares the web service operations as its methods, and an implementation (SIB), which defines the methods declared in the interface.

• The SIB can be either a POJO or a stateless session EJB. 

Annotations to create web services

While creating a web service bottom up, we can configure the SEI and SIB to act as a web service using annotations.

In case of bottom up web service, the binding properties in a WSDL can be specified using these annotations.

You can find a summary of the most commonly used annotations for creating web services @ http://javajee.com/common-annotations-used-to-create-web-services.

Endpoint Publisher

We can use a standalone publisher like Endpoint publisher (javax.xml.ws.Endpoint) or a webcontainer like Tomcat.