@Entity
@Table(name = "users")
public class User {

    public enum Role {
        ROLE_USER, ROLE_ADMIN
    }

    @Id
    @GeneratedValue (strategy = GenerationType.AUTO)
    @Column(name = "user_id")
    private long ID;

    @Column(name = "firstname")
    private String firstName;

    @Column(name = "lastname")
    private String lastName;

    @Column(name = "login")
    private String login;

    @Column(name = "password")
    private String passwordHash;

    @Column(name = "role")
    private Role role;

    @OneToMany (mappedBy = "users", cascade = CascadeType.ALL)
    private Set<TableC> tableCSet;

    public User() {
    }

    public long getID() {
        return ID;
    }

    public void setID(long ID) {
        this.ID = ID;
    }

    public String getFirstName() {
        return firstName;
    }

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

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getLogin() {
        return login;
    }

    public void setLogin(String login) {
        this.login = login;
    }

    public String getPasswordHash() {
        return passwordHash;
    }

    public void setPasswordHash(String passwordHash) {
        this.passwordHash = passwordHash;
    }

    public Role getRole() {
        return role;
    }

    public void setRole(Role role) {
        this.role = role;
    }

    public Set<TableC> getTableCSet() {
        return tableCSet;
    }

    public void setTableCSet(Set<TableC> tableCSet) {
        this.tableCSet = tableCSet;
    }
}

@Entity
@Table(name = "tables")
public class TableC {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "table_id")
    private long ID;

    @Column(name = "table_number")
    private Integer tableNumber;

    @Column(name = "assigned")
    private boolean tableStatus;

    @ManyToOne
    @JoinColumn (name = "user_id")
    private User user;

    public TableC() {
    }

    public long getID() {
        return ID;
    }

    public void setID(long ID) {
        this.ID = ID;
    }

    public Integer getTableNumber() {
        return tableNumber;
    }

    public void setTableNumber(Integer tableNumber) {
        this.tableNumber = tableNumber;
    }

    public boolean isTableStatus() {
        return tableStatus;
    }

    public void setTableStatus(boolean tableStatus) {
        this.tableStatus = tableStatus;
    }

    public User getUser() {
        return user;
    }

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

CREATE TABLE users (

 user_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,

 firstname VARCHAR (50) NOT NULL,

 lastname VARCHAR (50) NOT NULL,

 login VARCHAR (50) NOT NULL,

 password VARCHAR (200) NOT NULL,

 role BIT NOT NULL

)
  ENGINE = InnoDB;

CREATE TABLE tables (

 table_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,

 table_number INT NOT NULL,

 assigned BIT NOT NULL,

 user_id INT NOT NULL,

 FOREIGN KEY (user_id) REFERENCES users (user_id)

)
  ENGINE = InnoDB;

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:jpa="http://www.springframework.org/schema/data/jpa"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/data/jpa
    http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd">


    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <bean id="sessionFactory"
          class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
            </props>
        </property>
        <property name="packagesToScan"  value="am.sfl.cafemanager.model"/>
    </bean>

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" scope="request">
        <property name="dataSource" ref="dataSource"/>
        <property name="packagesToScan" value="am.sfl.cafemanager.model"/>
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
        </property>
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>

    <bean id="transactionManager"
          class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

    <tx:annotation-driven/>

    <jpa:repositories base-package="am.sfl.cafemanager.dao"/>
</beans>