1. 输出虚拟机内存回收信息的jvm参数

-XX:+PrintGC -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCApplicationStoppedTime -Xloggc:jvm-log-file

2. 输出类加载信息

-verbose:class

参考：
1. http://www.cnblogs.com/edwardlauxh/archive/2010/04/25/1918603.html
2. https://www.cnblogs.com/java-class/archive/2013/04/18/3027884.html
3. https://yq.aliyun.com/articles/48789