Arthas

官网：https://arthas.aliyun.com/

arthas-tunnel-server-3.5.6-fatjar.jar

http://127.0.0.1:8080/actuator/arthas

http://localhost:8080/apps.html

watch

watch demo.MathGame primeFactors "{params[0], throwExp, @java.lang.Thread@currentThread().getStackTrace()}" -e -x 2

vmtool

利用JVMTI接口，实现查询内存对象

案例1：查看数据库对象

vmtool --action getInstances --className javax.sql.DataSource

vmtool --action getInstances --className javax.sql.DataSource --express 'instances[0].connectCount'

# mbean 方式查看数据库信息
mbean -E com.alibaba.druid:type=DruidDataSource,id=* Name|Url|PoolingCount|ActiveCount|MaxActive|WaitThreadCount|MaxWaitThreadCount|Id | grep -C