<?xml version="1.0" encoding="UTF-8"?>
<company>
  <employee id="E001">
    <firstName>Rajesh</firstName>
    <salary>95000</salary>
    <isActive>true</isActive>
    <address>
      <city>Bangalore</city>
      <zipCode>560001</zipCode>
    </address>
  </employee>
</company>

// Save as Root.java. Java 8 has JAXB built in; on Java 11+ add jakarta.xml.bind-api
// and jaxb-runtime 2.3.x. On Jakarta EE 9+ or Spring Boot 3, change javax.xml.bind to jakarta.xml.bind.
// Read a document with: Root data = (Root) JAXBContext.newInstance(Root.class)
//     .createUnmarshaller().unmarshal(new StringReader(xml));

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "company")
@XmlAccessorType(XmlAccessType.FIELD)
public class Root {

    @XmlElement(name = "employee")
    private Employee employee;

    public Employee getEmployee() {
        return employee;
    }

    public void setEmployee(Employee employee) {
        this.employee = employee;
    }

    @XmlAccessorType(XmlAccessType.FIELD)
    public static class Employee {

        @XmlAttribute(name = "id")
        private String id;

        @XmlElement(name = "firstName")
        private String firstName;

        @XmlElement(name = "salary")
        private Integer salary;

        @XmlElement(name = "isActive")
        private Boolean isActive;

        @XmlElement(name = "address")
        private Address address;

        public String getId() {
            return id;
        }

        public void setId(String id) {
            this.id = id;
        }

        public String getFirstName() {
            return firstName;
        }

        public void setFirstName(String firstName) {
            this.firstName = firstName;
        }

        public Integer getSalary() {
            return salary;
        }

        public void setSalary(Integer salary) {
            this.salary = salary;
        }

        public Boolean getIsActive() {
            return isActive;
        }

        public void setIsActive(Boolean isActive) {
            this.isActive = isActive;
        }

        public Address getAddress() {
            return address;
        }

        public void setAddress(Address address) {
            this.address = address;
        }
    }

    @XmlAccessorType(XmlAccessType.FIELD)
    public static class Address {

        @XmlElement(name = "city")
        private String city;

        @XmlElement(name = "zipCode")
        private Integer zipCode;

        public String getCity() {
            return city;
        }

        public void setCity(String city) {
            this.city = city;
        }

        public Integer getZipCode() {
            return zipCode;
        }

        public void setZipCode(Integer zipCode) {
            this.zipCode = zipCode;
        }
    }
}