Issue with java plugin

Hi,

I have one problem with the new version of Thundebird. I develop an
extension that call java code and this call a function in Javascript code,
but this part is not invoked, if I call other Java method that no return a
JSObject, no have problem. The Javascript's code pass a JSObject with
function object and Java invoke this function. There are any configuration
that I can do? I guess that the problem is with the plugin.jar, but I don't
know how to do. Please anybody help me.