PluginSettingsFactory does not create transactions

org.springframework.dao.InvalidDataAccessApiUsageException: 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.
	at org.springframework.orm.hibernate3.HibernateTemplate.checkWriteOperationAllowed(HibernateTemplate.java:1175)
	at org.springframework.orm.hibernate3.HibernateTemplate$16.doInHibernate(HibernateTemplate.java:739)
	at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)
	at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
	at org.springframework.orm.hibernate3.HibernateTemplate.saveOrUpdate(HibernateTemplate.java:737)
	at com.atlassian.crowd.util.persistence.hibernate.HibernateDao.update(HibernateDao.java:63)
	at com.atlassian.crowd.dao.property.PropertyDAOHibernate.update(PropertyDAOHibernate.java:62)
	at com.atlassian.crowd.manager.property.PluginPropertyManagerGeneric.setProperty(PluginPropertyManagerGeneric.java:64)
	at com.atlassian.sal.crowd.pluginsettings.CrowdPluginSettings.putActual(CrowdPluginSettings.java:54)
	at com.atlassian.sal.core.pluginsettings.AbstractStringPluginSettings.put(AbstractStringPluginSettings.java:76)
	at group.ExampleServlet.doGet(ExampleServlet.java:44)