#29 NullPointerException: Bottom-Up compare

[Sergej Alekseev]

After swaping the inputs the Bottom-Up algorithm throws an NullPOinter Exception:

java.lang.NullPointerException
    at com.drgarbage.algorithms.BottomUpMaxCommonSubtreeIsomorphism.mapIsomorphicNodes(BottomUpMaxCommonSubtreeIsomorphism.java:429)
    at com.drgarbage.algorithms.BottomUpMaxCommonSubtreeIsomorphism.bottomUpUnorderedMaxCommonSubtreeIsomorphism(BottomUpMaxCommonSubtreeIsomorphism.java:180)
    at com.drgarbage.algorithms.BottomUpMaxCommonSubtreeIsomorphism.bottomUpUnorderedMaxCommonSubreeIsomorphism(BottomUpMaxCommonSubtreeIsomorphism.java:144)
    at com.drgarbage.controlflowgraphfactory.compare.GraphMergeViewer.doBottomUpMaxCommonAlg(GraphMergeViewer.java:479)
    at com.drgarbage.controlflowgraphfactory.compare.actions.BottomUpMaxCommonAlgAction.run(BottomUpMaxCommonAlgAction.java:51)
    at org.eclipse.jface.action.Action.runWithEvent(Action.java:499)

To reproduce the behavior download the G1 and G2 graphs. OPen Compare-Dialog and call Bottom-Up Compare Algorithm, Swap the inputs and call the algorithm again

[Artem]

graphs are being in spanning trees converted