Getting NullPointerException when trying to get centrality vertex score when analyzing centralities
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I analyzing graphs using Jung for a college project. I've downloaded some graphs from this this website and converted them into .graphml files with Gephi. I've implemented almost everything and now I have to make reports on graphs. The problem is while I am analyzing centralities, I get NullPointerException when getting centrality vertex score. Probably will be problematic when analyzing macroscopic structures of graphs.
I don't know what's wrong with the project. It worked for the first file (adjnoun.graphml), but it didn't for others. GraphReader, Analyzers and Decomposers (that I have to manually implement) seem to be fine.
Here are the files from my GitHub repo:
adjnoun.graphml Works
celegansneural.graphml Doesn't work
football.graphml Doesn't work
polbooks.graphml Doesn't work