JAX-WS Handler Chain: messages interceptor

We want to intercept the WS input and output. In order to:

  • Logging any part in the message
  • Registering sent messages
  • Add security controls
  • ….

Here we are going to do a input/output WS example log.

We annotate the WS with Handler Chain descriptor:

@WebService
@HandlerChain(file="src/META-INF/handlerChain.xml")
public class Hello {
@WebMethod
    public String sayHello(String name) {
        return "Hello, "+name+".";
    }
}

It will have the following contents:

<?xml version="1.0" encoding="UTF-8"?>
<handler-chains xmlns="http://java.sun.com/xml/ns/javaee">  
   <handler-chain>  
      <handler>  
         <handler-class>lebrijo.handlers.WSHandler</handler-class>  
      </handler>  
   </handler-chain>  
</handler-chains>

WSHandler class will implements the SOAPHandler interface:

public class WSHandler implements SOAPHandler<SOAPMessageContext> {  
 
     public Set<QName> getHeaders() {  
         return null;  
     }  
 
     public boolean handleFault(SOAPMessageContext context) {  
         logToSystemOut(context);  
         return true;  
     }  
 
     public boolean handleMessage(SOAPMessageContext context) {  
         logToSystemOut(context);  
         return true;  
     }  
 
     private void logToSystemOut(SOAPMessageContext smc) {  
         Boolean outboundProperty = (Boolean) smc.get(MessageContext.MESSAGE_OUTBOUND_PROPERTY);  
 
         if (outboundProperty.booleanValue()) {  
             System.out.println("Outgoing message:");  
         } else {  
             System.out.println("Incoming message:");  
         }  
 
         SOAPMessage message = smc.getMessage();  
         try {  
             message.writeTo(System.out);  
         } catch (Exception e) {  
             System.out.println("Exception in handler: " + e);  
         }  
     }
 
	public void close(MessageContext context) {
		// TODO Auto-generated method stub
 
	}

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