JGraphT Core v1.5.2 was discovered to contain a NullPointerException via the component org.jgrapht.alg.util.ToleranceDoubleComparator::compare(Double, Double). http://jgrapht.com https://gist.github.com/LLM4IG/5feabadf06a88102df316174123e2770 https://github.com/jgrapht/jgrapht