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[Spring] Fix character conversion error

Merged Administrator requested to merge github/fork/ackintosh/fix-multibyte into master

Created by: ackintosh

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Description of the PR

In order to run a Spring stub server which returns multibyte example value, we need set character encoding.

This PR fixes the error below:

2018-10-08 20:42:09.842 ERROR 10859 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.RuntimeException: java.io.CharConversionException: Not an ISO 8859-1 character: [こ]] with root cause