[Jung-support] [Open Discussion] ClosenessCentrality Problem

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The following forum message was posted by yzhang14 at http://sourceforge.net/projects/jung/forums/forum/252062/topic/6373161:

My program crashed when calling the getVertexScore() function of ClosenessCentrality.
A null pointer exception is reported. Please see both below. I can run
BetweennessCentrality, PageRank without any problem. I found a thread on this
in the forum that was posted several years ago. It seems there is a solution,
but the instruction wasn't complete. Any help will be appreciated!

		ClosenessCentrality closenessScorer = new
ClosenessCentrality(socialNetworkJung);
		for (User user : socialNetworkJung.getVertices()) {
			closenessMap.put(user, closenessScorer.getVertexScore(user));

java.lang.NullPointerException
	at edu.uci.ics.jung.algorithms.scoring.DistanceCentralityScorer.getVertexScore(
DistanceCentralityScorer.java:194)

Yifeng Zhang
Univ. of Illinois at Springfield