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  1. Java Web Services enable application-to-application communication over a network using open standards like XML, SOAP, WSDL, and UDDI. They are stateless, loosely coupled, and can be consumed by clients written in any language, ensuring interoperability.

    Types of Java Web Services

    • SOAP (JAX-WS): XML-based protocol, platform-independent, suitable for enterprise-grade services.

    • REST (JAX-RS): Lightweight, resource-oriented, often uses JSON/XML over HTTP, easier to implement.

    Example: SOAP Web Service with JAX-WS

    package com.example;

    import javax.jws.WebMethod;
    import javax.jws.WebService;
    import javax.xml.ws.Endpoint;

    @WebService
    public class HelloService {

    @WebMethod
    public String sayHello(String name) {
    return "Hello " + name;
    }

    public static void main(String[] args) {
    Endpoint.publish("http://localhost:8080/hello", new HelloService());
    System.out.println("Service running at http://localhost:8080/hello?wsdl");
    }
    }
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