java.lang.NullPointerException

GitHub | nolberg | 7 months ago
tip
Click on the to mark the solution that helps you, Samebug will learn from it.
As a community member, you’ll be rewarded for you help.

Root Cause Analysis

  1. java.lang.NullPointerException

    No message provided

    at org.jgrapht.util.UnorderedVertexPair.hashCode()
  2. JGraphT
    UnorderedVertexPair.hashCode
    1. org.jgrapht.util.UnorderedVertexPair.hashCode(UnorderedVertexPair.java:71)
    1 frame
  3. Java RT
    HashMap.get
    1. java.util.HashMap.hash(HashMap.java:338)
    2. java.util.HashMap.get(HashMap.java:556)
    2 frames
  4. org.jgrapht.graph
    FastLookupUndirectedSpecifics.getEdge
    1. org.jgrapht.graph.specifics.FastLookupUndirectedSpecifics.getEdge(FastLookupUndirectedSpecifics.java:91)
    1 frame
  5. JGraphT
    HopcroftKarpBipartiteMatching.<init>
    1. org.jgrapht.graph.AbstractBaseGraph.getEdge(AbstractBaseGraph.java:159)
    2. org.jgrapht.alg.HopcroftKarpBipartiteMatching.symmetricDifference(HopcroftKarpBipartiteMatching.java:182)
    3. org.jgrapht.alg.HopcroftKarpBipartiteMatching.maxMatching(HopcroftKarpBipartiteMatching.java:158)
    4. org.jgrapht.alg.HopcroftKarpBipartiteMatching.<init>(HopcroftKarpBipartiteMatching.java:84)
    4 frames