Spring Bean is not writable or has an invalid setter method - spring

Question

I'm experimenting with Spring, I'm following the book: Spring: A developer's notebook. I'm getting this error:
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'validateFile' defined in class path resource [batch-config.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'customersDAO' of bean class [com.emp.ValidateCustomer]: Bean property 'customersDAO' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
Below is my batch-config.xml:-
<bean id="validateFile" class="com.emp.ValidateCustomer" >
<property name="customersDAO">
<bean class="com.emp.dao.CustomerDao">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
</property>
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<property name="dataSource" ref="customerdb"/>
<property name="packagesToScan" value="com.emp" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.cglib.use_reflection_optimizer">false</prop>
<prop key="hibernate.jdbc.batch_size">50</prop>
<prop key="hibernate.default_batch_fetch_size">50</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.use_sql_comments">false</prop>
<prop key="hibernate.generate_statistics">false</prop>
<prop key="hibernate.format_sql">false</prop>
<prop key="hibernate.hbm2ddl.auto">false</prop>
<prop key="hibernate.enable_lazy_load_no_trans">true</prop>
</props>
</property>
</bean>
</bean>
Below is CustomersDao.java:-
#Repository
public class CustomersDao {
#SuppressWarnings("deprecation")
private HibernateTemplate hibernateTemplate=null;
#Autowired
#Qualifier("sessionFactory")
public void setSessionFactory(SessionFactory sessionFactory) {
hibernateTemplate = new HibernateTemplate(sessionFactory);
}
}
And in ValidateCustomer.java:-
#Autowired
private CustomersDao customersDAO;
Please help.

Answer 1

As #MarcosBarbero says, without seeing more of ValidateCustomer.java, it's impossible to be definitive about the problem.
What annotations are on the ValidateCustomer class? I have no problem with Autowired for a private property when the enclosing class is a component or service. If it's not, then do you have a public setter? The property is not public, if the setter is not public, Spring won't be able to set it.