Facing TransactionRequiredException while executing the Delete operation from DAO

I am quite new to spring MVC. Below I mentioned the exception (javax.persistence.TransactionRequiredException: Executing an update/delete query) I am getting whenever I am going to execute DELETE query. The code is working fine with CREATE and READ operations.

------>I am using Spring 4.3.2.RELEASE and HIBERNATE 5.2.7

servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://ift.tt/GArMu6"
    xmlns:xsi="http://ift.tt/ra1lAU" xmlns:aop="http://ift.tt/OpNdV1"
    xmlns:context="http://ift.tt/GArMu7"
    xmlns:jdbc="http://ift.tt/18IIlo0" xmlns:mvc="http://ift.tt/1bHqwjR"
    xmlns:oxm="http://ift.tt/KwCHtD" xmlns:task="http://ift.tt/LFBt0P"
    xmlns:tx="http://ift.tt/OGfeU2"
    xsi:schemaLocation="http://ift.tt/GArMu6 http://ift.tt/1jdM0fG
        http://ift.tt/OpNdV1 http://ift.tt/2gztjWH
        http://ift.tt/GArMu7 http://ift.tt/1YBgPjE
        http://ift.tt/18IIlo0 http://ift.tt/1UqMotm
        http://ift.tt/1bHqwjR http://ift.tt/28ICy73
        http://ift.tt/KwCHtD http://ift.tt/2lF2YZY
        http://ift.tt/LFBt0P http://ift.tt/1YBgUnw
        http://ift.tt/OGfeU2 http://ift.tt/1UqMu4g">

    <mvc:annotation-driven />
    <context:component-scan base-package="com.practice.controller"></context:component-scan>
    <context:component-scan base-package="com.practice.dao"></context:component-scan>
    <bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/dbutil"></property>
        <property name="username" value="root"></property>
        <property name="password" value="1234"></property>
    </bean>

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="annotatedClasses" value="com.practice.model.Student"></property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
            </props>
        </property>
    </bean>

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate5.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"></property>
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager" />

    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix">
            <value>/WEB-INF/views/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>

    <!-- To create classes -->

    <bean id="studentDaoSupport" class="com.practice.dao.StudentDaoImpl"></bean>

    <bean id="studentService" class="com.practice.services.StudentServiceImpl"></bean>   
</beans>

Model Class

@Entity
@Table(name = "STUDENT")
public class Student {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "STUD_ID")
    private int studId;
    @Column(name="STUD_NAME")
    private String studName;
    @Column(name = "STUD_STD")
    private String studStd;


    public int getStudId() {
        return studId;
    }
    public void setStudId(int studId) {
        this.studId = studId;
    }
    public String getStudName() {
        return studName;
    }
    public void setStudName(String studName) {
        this.studName = studName;
    }
    public String getStudStd() {
        return studStd;
    }
    public void setStudStd(String studStd) {
        this.studStd = studStd;
    }

}

DAO Implementation Class

@Repository
public class StudentDaoImpl implements StudentDaoSupport {

    public StudentDaoImpl(){
        System.out.println("Student Dao Impl object created");
    }

    @Autowired
    private SessionFactory sessionFactory;

    @Override
    @Transactional
    public void saveStudent(Student student) {
        //Database connection logic goes here
        System.out.println("dao layer = saveStudent Method");
        Session session = sessionFactory.openSession();
        session.saveOrUpdate(student);
        System.out.println("student data saved");
    }

    @Override
    @Transactional
    public List<Student> studentList() {
        // TODO Auto-generated method stub
        List<Student> list = new ArrayList<Student>();
        Session session = sessionFactory.openSession();
        Criteria criteria = session.createCriteria(Student.class);
        list.clear();
        list = criteria.list();
        return list;
    }

    @Override
    @Transactional
    public void deleteStudent(Integer studId) {
        Session session = sessionFactory.openSession();     
        Query q = session.createQuery("DELETE from Student where studId=:id");
        q.setParameter("id", studId);
        q.executeUpdate();      
        System.out.println("deleted successfully");
    }
}