I have a quick favour to ask.
Could you please run this code, and lemme know what you get?
<cfdump var="#createObject("java", "coldfusion.runtime.SessionTracker")#">
I get this:
|object of coldfusion.runtime.SessionTracker|
What I do not get is a cleanup(java.lang.String, java.lang.String) method listed. However sometimes some people do.
If you look at Leigh's comments on this question on Stack Overflow: "ColdFusion SessionTracker and forcing the session to end", he's seen it. And on one of our CF instances we see it too.
It's not a ColdFusion version situation, as we're all looking at the same version: 9,0,1,274733. It doesn't seem to be a Java-version difference (and there'd be no logic to this if there was!), as I've checked Java 6 and Java 7. We can't think what the differentiating factor might be.
So if you could please run that code and post back with whether you see a public cleanUp() method in there or not, and your CF version, OS, install type etc... that'd be really helpful.