This part of the build logs is more relevant:
[junit] Tests run: 19, Failures: 1, Errors: 1, Skipped: 1, Time
elapsed: 6.243 sec
[junit] Test
org.apache.commons.math3.optim.nonlinear.scalar.noderiv.BOBYQAOptimizerTest
FAILED
[junit] Tests run: 19, Failures: 1, Errors: 1, Skipped: 1, Time
elapsed: 6.258 sec
[junit] Test
org.apache.commons.math3.optimization.direct.BOBYQAOptimizerTest
FAILED
And possibly related to this bug reported upstream:
https://issues.apache.org/jira/browse/MATH-1057
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