get static fields of a class in a heap dump in OQL

Question

I have a heap dump and I'm using Eclipse MAT, though I suppose this should work through visualvm or whatever OQL client.

We can select fields of all instances of a class by doing something like

select s.field1, s.field2 from org.me.MyClass

... but this is restricted to member variables, and to types with instances.

How can select the static fields of a class with no instances?

This is somewhat related to this other question.

Answer 1

To access static field 'props' of class java.lang.System you can use (in VisualVM)

select heap.findClass("java.lang.System").statics.props
select heap.findClass("java.lang.System").props

Answer 2

This is a bit hackish, but works in MAT:

SELECT c.SIZE
FROM INSTANCEOF java.lang.Class c
WHERE c.@displayName.contains("class java.lang.Integer ")