java-version 11로 변경(설치된 jdk 버전)

 

spring version 4.3.8로 변

 

maven compiler plugin 11로 변경

 

web.xml 파일에 인코딩 필터 추가

<!-- UTF-8 처리 필터 등록 -->
<filter>
   <filter-name>encoding</filter-name>
   <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
   <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
   </init-param>
   <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
   </init-param>
</filter>
<filter-mapping>
   <filter-name>encoding</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>