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Try adding startup parameters: -Dfile.encoding=utf-8

Based on your description, I guess it’s a problem with MessageConverter

Add this

<bean
        class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="jsonMessageConverter" />
            </list>
        </property>
    </bean>

    <!-- Configure bean to convert JSON to POJO and vice versa -->
    <bean id="jsonMessageConverter"
        class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
    </bean>

It has been solved. Annotation-driven is not supported because the namespace definition file referenced by the xml header generated by idea itself is 3.0. Just change it to the latest one. In the end, the message-converter is reset through annotation-driven. Encoded properties.