JAX-WS Handlers - 6.1

Talend ESB Service Developer Guide

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6.1
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Design and Development
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If you are using the JAX-WS frontend, JAX-WS supports the concept of logical and protocol handlers. Protocol handlers allow you to manipulate the message in its raw, often XML-based, form - i.e. a SAAJ SOAPMessage. Logical handlers allow you to manipulate the message after its already been bound from the protocol to the JAXB object that your service will receive.