problem with Messages.InputValidator?

Hi,

I can't get the Messages.InputValidator to work.

com.intellij.openapi.ui.Messages.showInputDialog
( "question"
, "header"
, com.intellij.openapi.ui.Messages.getQuestionIcon()
, "default"
, new com.intellij.openapi.ui.Messages.InputValidator() {
public boolean checkInput( String s ) {
return true;
}
public boolean canClose( String s ) {
return true;
}
}
) );

results in the following error:

Error: line (.) cannot resolve symbol class InputValidator




I've tried compiling with all my installed jdk's.. none seem to like te
construction (or any variant of code trying to use the InputValidator
interface)

Please help...

Aiko