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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