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. 
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