org.hibernate.MappingException: Unable to load class [ models.Question] declared in Hibernate configuration <mapping/> entry
java.lang.ClassNotFoundException: models.Question

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>

        <property name="connection.url">jdbc:postgresql://localhost:5432/Overhaul</property>
        <property name="connection.driver_class">org.postgresql.Driver</property>
        <property name="connection.username">postgres</property>
        <property name="connection.password">postgres</property>
        <property name="hibernate.connection.pool_size">10</property>
        <property name="show_sql">true</property>
        <property name="dialect">org.hibernate.dialect.PostgreSQL9Dialect</property>
        <property name="hibernate.current_session_context_class">thread</property>
        <mapping class="models.Question"/>
    </session-factory>
</hibernate-configuration>

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" version="2.1">

    <persistence-unit name="NewPersistenceUnit">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>models.Question</class>
        <properties>
            <property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/Overhaul"/>
            <property name="hibernate.connection.driver_class" value="org.postgresql.Driver"/>
            <property name="hibernate.connection.username" value="postgres"/>
            <property name="hibernate.connection.password" value="postgres"/>
            <property name="hibernate.archive.autodetection" value="class"/>
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.format_sql" value="true"/>
            <property name="hbm2ddl.auto" value="update"/>
        </properties>
    </persistence-unit>
</persistence>

@Entity
public class Question {
    private int id;
    private String message;
    private String authorName;
    private Date postDate;

    @Id
    @Column(name = "id")
    public int getId() {
        return id;
    }

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

    @Basic
    @Column(name = "message")
    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    @Basic
    @Column(name = "author_name")
    public String getAuthorName() {
        return authorName;
    }

    public void setAuthorName(String authorName) {
        this.authorName = authorName;
    }

    @Basic
    @Column(name = "post_date")
    public Date getPostDate() {
        return postDate;
    }

    public void setPostDate(Date postDate) {
        this.postDate = postDate;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Question question = (Question) o;

        if (id != question.id) return false;
        if (authorName != null ? !authorName.equals(question.authorName) : question.authorName != null) return false;
        if (message != null ? !message.equals(question.message) : question.message != null) return false;
        if (postDate != null ? !postDate.equals(question.postDate) : question.postDate != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = id;
        result = 31 * result + (message != null ? message.hashCode() : 0);
        result = 31 * result + (authorName != null ? authorName.hashCode() : 0);
        result = 31 * result + (postDate != null ? postDate.hashCode() : 0);
        return result;
    }
}