@Entity
@Table(name = "events", catalog = "calendar")
public class Events implements java.io.Serializable {

    private Integer idEvent;
    private int user;
    private String nameEvent;
    private String description;
    private String location;
    private Date beginDate;
    private Date endDate;
    private int client;
    private String project;
   
    public Events() {
    }

    public Events(int user, String nameEvent, String description, String location, Date beginDate, Date endDate, int client, String project) {
        this.user = user;
        this.nameEvent = nameEvent;
        this.description = description;
        this.location = location;
        this.beginDate = beginDate;
        this.endDate = endDate;
        this.client = client;
        this.project = project;
    }

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "id_event", unique = true, nullable = false)
    public Integer getIdEvent() {
        return this.idEvent;
    }

    public void setIdEvent(Integer idEvent) {
        this.idEvent = idEvent;
    }

    @Column(name = "user", nullable = false)
    public int getUser() {
        return this.user;
    }

    public void setUser(int user) {
        this.user = user;
    }

    @Column(name = "name_event", nullable = false, length = 25)
    public String getNameEvent() {
        return this.nameEvent;
    }

    public void setNameEvent(String nameEvent) {
        this.nameEvent = nameEvent;
    }

    @Column(name = "description", nullable = false, length = 50)
    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    @Column(name = "location", nullable = false, length = 25)
    public String getLocation() {
        return this.location;
    }

    public void setLocation(String location) {
        this.location = location;
    }

    @Temporal(TemporalType.DATE)
    @Column(name = "begin_date", nullable = false, length = 10)
    public Date getBeginDate() {
        return this.beginDate;
    }

    public void setBeginDate(Date beginDate) {
        this.beginDate = beginDate;
    }

    @Temporal(TemporalType.DATE)
    @Column(name = "end_date", nullable = false, length = 10)
    public Date getEndDate() {
        return this.endDate;
    }

    public void setEndDate(Date endDate) {
        this.endDate = endDate;
    }

    @Column(name = "client", nullable = false)
    public int getClient() {
        return this.client;
    }

    public void setClient(int client) {
        this.client = client;
    }

    @Column(name = "project", nullable = false, length = 25)
    public String getProject() {
        return this.project;
    }

    public void setProject(String project) {
        this.project = project;
    }

<hibernate-mapping>
    <class catalog="calendar" name="entites.Events" table="events">
        <id name="idEvent" type="java.lang.Integer">
            <column name="id_event"/>
            <generator class="identity"/>
        </id>
       
        <property name="user" type="int">
            <column name="user" not-null="true"/>
        </property>

        <property name="nameEvent" type="string">
            <column length="25" name="name_event" not-null="true"/>
        </property>

        <property name="description" type="string">
            <column length="50" name="description" not-null="true"/>
        </property>

        <property name="location" type="string">
            <column length="25" name="location" not-null="true"/>
        </property>

        <property name="beginDate" type="date">
            <column length="10" name="begin_date" not-null="true"/>
        </property>

        <property name="endDate" type="date">
            <column length="10" name="end_date" not-null="true"/>
        </property>

        <property name="client" type="int">
            <column name="client" not-null="true"/>
        </property>

        <property name="project" type="string">
            <column length="25" name="project" not-null="true"/>
        </property>
    </class>
</hibernate-mapping>

@Entity
@Table(name = "clients", catalog = "calendar")
public class Clients implements java.io.Serializable {

    private Integer idClient;
    private String nameClient;
    private String address;
    private String phone;
    private String contact;
    private String color;

    public Clients() {
    }

    public Clients(String nameClient, String address, String phone, String contact, String color) {
        this.nameClient = nameClient;
        this.address = address;
        this.phone = phone;
        this.contact = contact;
        this.color = color;
    }

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "id_client", unique = true, nullable = false)
    public Integer getIdClient() {
        return this.idClient;
    }

    public void setIdClient(Integer idClient) {
        this.idClient = idClient;
    }

    @Column(name = "name_client", nullable = false, length = 25)
    public String getNameClient() {
        return this.nameClient;
    }

    public void setNameClient(String nameClient) {
        this.nameClient = nameClient;
    }

    @Column(name = "address", nullable = false, length = 100)
    public String getAddress() {
        return this.address;
    }

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

    @Column(name = "phone", nullable = false, length = 15)
    public String getPhone() {
        return this.phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    @Column(name = "contact", nullable = false, length = 25)
    public String getContact() {
        return this.contact;
    }

    public void setContact(String contact) {
        this.contact = contact;
    }

    @Column(name = "color", nullable = false, length = 10)
    public String getColor() {
        return this.color;
    }

    public void setColor(String color) {
        this.color = color;
    }

<hibernate-mapping>
    <class catalog="calendar" name="entites.Clients" table="clients">
        <id name="idClient" type="java.lang.Integer">
            <column name="id_client"/>
            <generator class="identity"/>
        </id>

        <property name="nameClient" type="string">
            <column length="25" name="name_client" not-null="true"/>
        </property>

        <property name="address" type="string">
            <column length="100" name="address" not-null="true"/>
        </property>

        <property name="phone" type="string">
            <column length="15" name="phone" not-null="true"/>
        </property>

        <property name="contact" type="string">
            <column length="25" name="contact" not-null="true"/>
        </property>

        <property name="color" type="string">
            <column length="10" name="color" not-null="true"/>
        </property>
   
    </class>
</hibernate-mapping>

<many-to-one name="clientOfEvent" lazy="false"
                     insert="false"
                     update="false"
                     class="entites.Clients"
                     column="client"
                     not-null="true"
                     foreign-key="fk_events_client"/>