If you have experience on JWS and you want to enhance your knowledge to advance level, you first point of reference should be JAX-WS and JAX-RS API documentation. Just read these API documentation to go next advance level
Oracle certified JPA Developer (1Z0-898),Oracle certified Java 8 Programmer I (1Z0-808), Oracle Java Web Service Developer (1z0-897), Oracle certified Java 7 Programmer, SCJA 1.0, SCJP 5.0, SCWCD 5.0, Oracle SQL Fundamentals I, CIW Certified Ecommerce specialist
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