org.springframework.beans.factory.BeanCreationException: Error creating  bean with name 'entityManagerFactory' defined in ServletContext resource [/WEB-INF/appconfig-data.xml]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory

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

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

@Column(name = "username")
protected String username;

@Column(name = "password")
protected String password;

@Transient
private String confirmPassword;

@ManyToMany
@JoinTable(name = "user_roles", joinColumns = @JoinColumn(name = "user_id"),
        inverseJoinColumns = @JoinColumn(name = "role_id"))
private Set<Role> roles;

public Long getId() {
    return id;
}

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

public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}

public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}

public String getConfirmPassword() {
    return confirmPassword;
}

public void setConfirmPassword(String confirmPassword) {
    this.confirmPassword = confirmPassword;
}

public Set<Role> getRoles() {
    return roles;
}

public void setRoles(Set<Role> roles) {
    this.roles = roles;
}

@Entity
@Table(name = "roles")
public class RoleEntity{

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

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

@ManyToMany(mappedBy = "roles")
private Set<User> users;

public RoleEntity() {
}

public Long getId() {
    return id;
}

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

public String getName() {
    return name;
}

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

public Set<User> getUsers() {
    return users;
}

public void setUsers(Set<User> users) {
    this.users = users;
}

@Override
public String toString() {
    return "Role{" +
            "id=" + id +
            ", name='" + name + ''' +
            ", users=" + users +
            '}';
}

public class User extends UserEntity implements Comparable {

private boolean isOnline;
private String sex;
private int age;
private String comment;
private String email;
private String friendsLogins;
private Session session;

public User(String login, String password) {
     this.sex = null;
    this.comment = null;
    this.email = null;
    this.friendsLogins = "";

}

public User(User user) {
    this.sex = user.getSex();
    this.comment = user.getComment();
    this.email = user.getComment();
    this.friendsLogins = "";

}

public User(String login, String password, boolean isOnline, String sex, int age, String comment, String email) {
    this.sex = sex;
    this.age = age;
    this.comment = comment;
    this.email = email;
    this.friendsLogins = "";
}

public Session getSession() {
    return session;
}

public void setSession(Session session) {
    this.session = session;
}


public boolean isOnline() {
    return isOnline;
}

public void setOnline(boolean online) {
    isOnline = online;
}

public String getSex() {
    return sex;
}

public void setSex(String sex) {
    this.sex = sex;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

public String getComment() {
    return comment;
}

public void setComment(String comment) {
    this.comment = comment;
}

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getFriendsLogins() {
    return friendsLogins;
}

public void setFriendsLogins(String friendsLogins) {
    this.friendsLogins = friendsLogins;
}

public boolean equals(Object obj) {
    User user = (User) obj;
    if (user.getPassword().equals(this.password) && user.getUsername().equals(this.username)) {
        return true;
    } else {
        return false;
    }
}


@Override
public int compareTo(Object o) {
    User user = (User) o;
    if (user.getPassword().equals(this.password) && user.getUsername().equals(this.username)) {
        return 0;
    } else if (user.getAge() > this.getAge()) {
        return -1;
    } else {
        return 1;
    }
}

<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="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="packagesToScan" value="com.chat.my.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="com.chat.my.dao"/>