To answer this question, you need to understand the purpose and functionality of handlers in JAX-WS.
JAX-WS handlers are components that intercept and process messages exchanged between clients and web services. They allow developers to perform additional processing on the messages, such as logging, security, and modifying headers.
Let's go through each option to understand why it is correct or incorrect:
Option A) Logging protocol specific information - This option is a valid usage of handlers. Handlers can be used to log protocol-specific information, such as request and response messages.
Option B) Adding security information to the message - This option is a valid usage of handlers. Handlers can be used to add security information to the message, such as authentication or encryption.
Option C) Modifying protocol headers - This option is a valid usage of handlers. Handlers can be used to modify the protocol headers of the message, allowing customization and control over the message exchange.
Option D) Logic to service the request - This option is NOT a valid usage of handlers. Handlers are not meant to handle the business logic or service the request. They are primarily used for intercepting and processing messages, not for implementing the core functionality of the web service.
The correct answer is D. This option is incorrect because handlers are not meant to implement the logic to service the request.