You need to bind your fact to a variable, so that you can call the getFileOld
method from a non static context. Also, I think you'd be better to use !=
rather than the 'not' keyword ('not' should be read 'doesn't exist' which
doesn't work if you want to bind a value). So your rule should be something
like:
rule "files not equal"
when
$file : FileData(fileOld != fileNew)
then
System.out.println("files are not equal");
difference($file.getFileOld(),$file.getFileNew());
end
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