[google app engine] java.lang.management.ManagementFactory is a restricted class

google app engine 에서 다음 오류 발생

java.lang.management.ManagementFactory is a restricted class

아래주소에서 해결책 참고

https://stackoverflow.com/questions/16979283/problems-with-using-log4j-2-in-gae

appengine-web.xml 에 다음을 추가

<system-properties>

<property name="log4j2.disable.jmx" value="true" />

</system-properties>