java.lang.NullPointerException

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    • java.lang.NullPointerException at org.jgrapht.util.UnorderedVertexPair.hashCode(UnorderedVertexPair.java:71) at java.util.HashMap.hash(HashMap.java:338) at java.util.HashMap.get(HashMap.java:556) at org.jgrapht.graph.specifics.FastLookupUndirectedSpecifics.getEdge(FastLookupUndirectedSpecifics.java:91) at org.jgrapht.graph.AbstractBaseGraph.getEdge(AbstractBaseGraph.java:159) at org.jgrapht.alg.HopcroftKarpBipartiteMatching.symmetricDifference(HopcroftKarpBipartiteMatching.java:182) at org.jgrapht.alg.HopcroftKarpBipartiteMatching.maxMatching(HopcroftKarpBipartiteMatching.java:158) at org.jgrapht.alg.HopcroftKarpBipartiteMatching.<init>(HopcroftKarpBipartiteMatching.java:84)
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