Common terms in Web services

JAXB - API for XML Binding
JAXP - API for XML Processing
JAXM - API for XML Messaging
JAXR - API for XML Registries
JAX RPC - API for XML Remote Procedure Call
JAX TX - API for XML Transactions
JAAS- Java Authentication and Authorization Services 
JAF - Java Beans Activation Framework
JNDI- Java Native and Directory Interface
UDDI - Universal Description and Discovery Integration
WSDL - Web Service Description Language 
SOAP - Simple Object Access  Protocol
JSON - Java Script Object Notation
SAAJ- SOAP with Attachments for Java.


JAX WS ( API ) ( Metro = implementation ) ( requires WSDL ) 
JAX RS ( API ) ( Jersey = implementation ) 

Web service concept was developed to  remove short comings of  EJB .
An EJB can be also be deployed as  Web Service .

Since Java 1.6, there's a built-in HTTP server included with the JDK.

The HttpServer provides a simple high-level Http server API, which can be used to build embedded HTTP servers.

Endpoint.publish  accepts requests from a webservice  at a port at the same HTTP server .

for more into check out 

HTTP Server in JDK inbuilt