With expression like  ...  etc. WebWork Struts 2 will cut the stack and still returned return back a CompoundRoot object. To get the top of that particular stack cut, use 0.top
OGNL supports accessing static properties as well as static methods. As the OGNL docs point out, you can explicitly call statics by doing the following
By default, Struts 2 is configured to disallow this--to enable OGNL's static member support you must set the
struts.ognl.allowStaticMethodAccess constant to
true via any of the Constant Configuration methods.
OGNL's static access looks like this: