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Were exactly was this leak? The antlr2 classes are jarjar'ed, right - they were hardly API. Or am I missing something? As for usage: A quick search on GitHub for the string 'groovyjarjarantlr' revealed 12 commits, most of them in Adempiere and 'groovy-class-parser', in pretty old code.
I am thinking for example of the groovy-eclipse plugin. Also we do not catch all exceptions thrown by antlr afaik.
But maybe I overestimate the problem bye Jochen
