We are going to re-use the same data model for several examples. Therefore we will create the data model in a separate plugin. To use the data binding between the UI and the domain model in both directions the classes of the domain model needs to implement "PropertyChangeSupport".

Create a plugin project "de.vogella.databinding.person.model". Do not create an activator, do not select "This plug-in will make contributions to the UI" and select "No" for the question "Do you want to create a rich client application". Create the package "de.vogella.databinding.person.model" and the following classes.

				
package de.vogella.databinding.person.model;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

public class Person implements PropertyChangeListener {
	private String firstName;
	private String lastName;
	private boolean married;
	private String gender;
	private Integer age;
	private Address address;
	private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(
			this);

	public Person() {
	}

	public void addPropertyChangeListener(String propertyName,
			PropertyChangeListener listener) {
		propertyChangeSupport.addPropertyChangeListener(propertyName, listener);
	}

	public void removePropertyChangeListener(PropertyChangeListener listener) {
		propertyChangeSupport.removePropertyChangeListener(listener);
	}

	public String getFirstName() {
		return firstName;
	}

	public String getGender() {
		return gender;
	}

	public String getLastName() {
		return lastName;
	}

	public boolean isMarried() {
		return married;
	}

	public void setFirstName(String firstName) {
		propertyChangeSupport.firePropertyChange("firstName", this.firstName,
				this.firstName = firstName);
	}

	public void setGender(String gender) {
		propertyChangeSupport.firePropertyChange("gender", this.gender,
				this.gender = gender);
	}

	public void setLastName(String lastName) {
		propertyChangeSupport.firePropertyChange("lastName", this.lastName,
				this.lastName = lastName);
	}

	public void setMarried(boolean isMarried) {
		propertyChangeSupport.firePropertyChange("married", this.married,
				this.married = isMarried);
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		propertyChangeSupport.firePropertyChange("age", this.age,
				this.age = age);
	}

	public Address getAddress() {
		return address;
	}

	public void setAddress(Address address) {
		address.addPropertyChangeListener("country", this);
		propertyChangeSupport.firePropertyChange("address", this.address,
				this.address = address);
	}

	@Override
	public String toString() {
		return firstName + " " + lastName;
	}

	@Override
	public void propertyChange(PropertyChangeEvent event) {
		propertyChangeSupport.firePropertyChange("address", null, address);
	}

}
			

				
package de.vogella.databinding.person.model;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

public class Address {

	private String street;
	private String number;
	private String postalCode;
	private String city;
	private String country;
	private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(
			this);

	public void addPropertyChangeListener(String propertyName,
			PropertyChangeListener listener) {
		propertyChangeSupport.addPropertyChangeListener(propertyName, listener);
	}

	public void removePropertyChangeListener(PropertyChangeListener listener) {
		propertyChangeSupport.removePropertyChangeListener(listener);
	}

	public Address() {
	}

	public Address(String postalCode, String city, String country) {
		this.postalCode = postalCode;
		this.city = city;
		this.country = country;
	}

	public String getStreet() {
		return street;
	}

	public void setStreet(String street) {
		propertyChangeSupport.firePropertyChange("street", this.street,
				this.street = street);
	}

	public String getNumber() {
		return number;
	}

	public void setNumber(String number) {
		propertyChangeSupport.firePropertyChange("number", this.number,
				this.number = number);
	}

	public String getPostalCode() {
		return postalCode;
	}

	public void setPostalCode(String postalCode) {
		propertyChangeSupport.firePropertyChange("postalCode", this.postalCode,
				this.postalCode = postalCode);
	}

	public String getCity() {
		return city;
	}

	public void setCity(String city) {
		propertyChangeSupport.firePropertyChange("city", this.city,
				this.city = city);
	}

	public String getCountry() {
		return country;
	}

	public void setCountry(String country) {
		propertyChangeSupport.firePropertyChange("country", this.country,
				this.country = country);
	}

	public String toString() {
		String s = "";
		s += street != null ? street + " " : "";
		s += number != null ? number + " " : "";
		s += postalCode != null ? postalCode + " " : "";
		s += city != null ? city + " " : "";
		s += country != null ? country + " " : "";

		return s;
	}

}

			

Select the file MANIFEST.MF in the directory "META-INF". Select the tab "Runtime". Press the Add button and add the package "de.vogella.databinding.person.model". This will allow other plugins to use the classes from this package.