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| 1. Enter arthas
$ java -jar arthas-boot.jar 2133763
[arthas@2133763]$ jvm
[arthas@2133763]$ sysprop
[arthas@2133763]$ sysenv
[arthas@2133763]$ dashboard
[arthas@2133763]$ thread -b
2. sc - search class
[arthas@2133763]$ sc -d *SendShipInfoTasklet| grep classLoader
=> classLoaderHash 75faff
3. jad - java decompile
[arthas@2133763]$ jad -c 75faff --source-only xx.yy.frt.tasklet.SendShipInfoTasklet -d /tmp > /tmp/SendShipInfoTasklet.java
4. mc - memory compile
[arthas@2133763]$ mc -c 75faff /tmp/SendShipInfoTasklet.java -d /tmp
5. Or compile outside in IDE and place the class into /tmp
[arthas@2133763]$ redefine -c 75faff /tmp/SendShipInfoTasklet.class
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