arthas/arthas-tutorials-en/command/getstatic/getstatic.md

• It is recommended to use the [OGNL] (https://arthas.aliyun.com/doc/arthas-tutorials.html?language=en&id=ognl) command, which will be more flexible.

Use getstatic command to Check the static fields of classes conveniently, the usage is getstatic class_name field_name{{}} .

getstatic demo.MathGame random{{execute T2}}

• Specify classLoader Note that the hashcode changes, you need to check the current ClassLoader information first, and extract the hashcode corresponding to the ClassLoader using sc -d <ClassName>{{}} .
  if you use-c{{}} , you have to manually type hashcode by -c <hashcode>{{}} .
  For classloader with only one instance, it can be specified by --classLoaderClass{{}} using class name, which is more convenient to use.

getstatic --classLoaderClass jdk.internal.loader.ClassLoaders$AppClassLoader random{{execute T2}}

• PS: Here the classLoaderClass in java 8 is sun.misc.Launcher$AppClassLoader, while in java 11 it's jdk.internal.loader.ClassLoaders$AppClassLoader. Currently killercoda using java11.

The value of --classloaderclass{{}} is the class name of classloader. It can only work when it matches a unique classloader instance. The purpose is to facilitate the input of general commands. However, -c <hashcode>{{}} is dynamic.

Tip: if the static field is a complex class, you can even use OGNL{{}} to traverse, filter and access the inner properties of this class.

• OGNL official guide
• Special usages