<p>I'm not a java programmer (C/C++/C#) but the brackets look very suspect in that 2nd line.  Instead of<br>
execute(() -> update<br>
I suspect it should be:<br>
execute() -> update<br>
with one less close bracket on end of line.  Rather than running execute() on the selected thread it would seem to be trying to pass ().execute (i.e. running execute on null) as a parameter.  But as I said I'm a C/C++/C# programmer so am guessing.  Was only looking as I have a similar (but in different place) error.</p>

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