The command help is vague about what the `classname` option is supposed to do.

It says: "classname : [optional] Name of class whose hierarchy should be printed." This could mean either one presents a leaf class and gets the base classes printed; or one presents a base class and gets a tree printed. But neither of the following invocations produce any output:

```
$ jcmd Simple VM.class_hierarchy classname=java.lang.String
322175:
Command executed successfully
$ jcmd Simple VM.class_hierarchy classname=java/lang/String
322175:
Command executed successfully
$ jcmd Simple VM.class_hierarchy classname=java/lang/Object
322175:
Command executed successfully
$ jcmd Simple VM.class_hierarchy classname=java.lang.Object
322175:
Command executed successfully
```

Logically, at least one of them should print something, right? Or am I misunderstanding what "Class Hierarchy" means? In which case the help text should be improved.