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When posting a form as multipart/form-data, I encountered a situation where UTF-8 characters got garbled. I was using Spring’s CommonsMultipartResolver. The trick that solved it for me was to set the character set for multipartresolver bean.
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="UTF-8"/>
</bean>