enforce utf8 on mysql

src/main/resources/META-INF/persistence.xml

@@ -10,6 +10,7 @@
 		<properties>
 			<property name="hibernate.hbm2ddl.auto" value="update" />
 			<property name="hibernate.show_sql" value="${jpa.show_sql}" />
+			<property name="hibernate.dialect" value="${jpa.dialect}" />
 			<property name="hibernate.default_batch_fetch_size" value="100" />
 		</properties>
 	</persistence-unit>