Java 로그에 GC포함 시키는 방법
-verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -Xloggc:/usr/local/tomcat/log/gc.log -XX:+UseGCLogFileRotation -XX:GCLogFileSize=1m -XX:NumberOfGCLogFiles=100

예) java -jar undertow_project.jar -verbose:gc -XX:+PrintGCDetails

Java GC 무료 추천툴
https://blog.voidmainvoid.net/213