Github user PascalSchumacher commented on the issue:
https://github.com/apache/commons-lang/pull/334
@kinow Changes to throws declaration are binary compatible (see:
https://docs.oracle.com/javase/specs/jls/se7/html/jls-13.html#jls-13.4.21).
Removing checked exceptions from a throws declaration is source incompatible,
but removing unchecked exceptions is source compatible.
This confirmed by this pull request passing the clirr check (see:
https://travis-ci.org/apache/commons-lang/jobs/394527557#L3097)
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