Github user cestella commented on the issue:
https://github.com/apache/incubator-metron/pull/397
@jjmeyer0 @mmiklavc It appears that a regression was added relatively
recently that affects whitespace at the end of stellar rules (the whitespace
isn't sent to the skip channel in the lexer in that situation, for some
reason..not sure why). A stopgap is what JJ said, a slightly more permanant
fix considering whitespace has no meaning in Stellar is to trim the rule in
BaseStellarProcessor (line 111). I'd still consider it important to
investigate what is confusing the grammar suddenly, mind you.
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