Test.java

package jaxb;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlValue;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;

public class Test {
    public static void main(String[] args) throws JAXBException {
        List<Employee> employees = new ArrayList<Employee>();
        employees.add(new Employee("ABC"));
        employees.add(new Employee("DEF"));

        Metadata metadata = new Metadata("CSLWORLD", employees);

        JAXBContext jaxbContext = JAXBContext.newInstance(Metadata.class);
        Marshaller marshaller = jaxbContext.createMarshaller();

        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        marshaller.marshal(metadata, byteArrayOutputStream);

        String resultingXml = new String(byteArrayOutputStream.toByteArray());
        System.out.println(resultingXml);
    }
}

@XmlRootElement
class Metadata {
    private String name;
    private List<Employee> employees;

    public Metadata() {
    }

    public Metadata(String name, List<Employee> employees) {
        this.name = name;
        this.employees = employees;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @XmlElementWrapper(name="employees")
    @XmlElement(name="employee")
    public List<Employee> getEmployees() {
        return employees;
    }

    public void setEmployees(List<Employee> employees) {
        this.employees = employees;
    }
}

@XmlRootElement(name="employee")
class Employee {
    private String name;

    public Employee() {
    }

    public Employee(String name) {
        this.name = name;
    }

    @XmlValue
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Result :

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<metadata>
    <employees>
        <employee>ABC</employee>
        <employee>DEF</employee>
    </employees>
    <name>CSLWORLD</name>
</metadata>