Write operations are not allowed in read-only mode (FlushMode.MANUAL)

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SSH error information:
HTTP Status 500 – Internal Server Error
Type Exception Report
Message Write operations are not allowed in read-only mode (FlushMode.MANUAL): Turn your Session into FlushMode.COMMIT/AUTO or remove ‘readOnly’ marker from transaction definition.
Description The server encountered an unexpected condition that prevented it from fulfilling the request.

SSH error cause:

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<!-- database tx configuration -->
	<bean id="transactionManager"
		class="org.springframework.orm.hibernate5.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>
	<!-- Don't forget to add annotation at using tx place -->
	<tx:annotation-driven transaction-manager="transactionManager" /> <!-- permit annotation -->

SSH error solution:
Use annotation above the class where the method in the class deals with database.

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@Transactional