it would be nice if I knew WHICH parameter
Probably 't:component-trace', but I believe it would fail for any parameter.
I am not sure what is happening, but my guess is that your Jetty was
recently upgraded,
and now fails during parameter extraction (are your POSTed forms
relatively large, e.g. more than 1000 parameters?).
Probably Tapestry first gets an IllegalStateException trying to get
parameters during normal rendering
than again NullPointerException (because Jetty does not properly sets
internal request state after previous exception)
during rendering the exception page.
To check whether my speculations are correct, try setting a breakpoint
triggered by throwing IllegalStateException
and see if Jetty throws one.
Best regards,
Cezary
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