'Restful Web Services' by Sam Ruby is an essential guide for developers looking to master RESTful web services. Covering design principles, best practices, and real-world applications, this book is a valuable resource for building scalable and secure web services.

'Professional J2EE EAI' by Ramesh Nagappan is an essential guide for mastering enterprise application integration with J2EE, offering in-depth insights into patterns, technologies, and best practices for seamless business process integration.