60

Flow of a Web Service Call

Java client

Service implemen 

tation on J2EE plat 

form

Java call, 

Return 

Return 

Java call, 

parameter

value

value

parameter

1. Maps XML to 

1. Maps Java to 

1. Maps Java to 

1. Maps XML to 

Java

XML

XML

Java

2. Disassambles 

2. Forms SOAP 

2. Forms SOAP 

2. Disassambles 

SOAP message

message

message

SOAP message

1. Outgoing SOAP 

1. Incoming SOAP

1. Outgoing 

1. Incoming 

Handler actions

 Handler actions

SOAP Handler 

SOAP Handler 

2. Container services

2. Container 

actions

    services

actions

Web service 

port

JAX RPC client side runtime  

JAX RPC runtime in a J2EE 

container

Internet

SOAP message

Figure 3.1

Flow of a Web Service on Java Platform

Before the port passes the request to the endpoint, it ensures that the J2EE

container applies its declarative services (such as security checks) to the SOAP

request. After that, any developer written SOAP handlers in place are applied to

the request. Note that SOAP handlers, which are optional, let developers apply

application specific processing logic common to all requests and responses that

flow through this endpoint. After the handlers operate on the SOAP message, the

message is passed to the service endpoint.