Cannot invoke "Object.equals(Object)" because the return value of "org.hipparchus.geometry.partitioning.BSPTree.getAttribute()" is null

[Sohnny0]

I got a null pointer exception when I ran the code below. I guess it's a minor bug.

try {
intersection = (SphericalPolygonsSet) factory.intersection(zone.copySelf(), targetSphericalPolygonsSet.copySelf());
} catch (Exception e) {
e.printStackTrace();
}

java.lang.NullPointerException: Cannot invoke "Object.equals(Object)" because the return value of "org.hipparchus.geometry.partitioning.BSPTree.getAttribute()" is null
at org.hipparchus.geometry.partitioning.RegionFactory$VanishingToLeaf.fixNode(RegionFactory.java:381)
at org.hipparchus.geometry.partitioning.BSPTree.insertInTree(BSPTree.java:680)
at org.hipparchus.geometry.partitioning.RegionFactory$IntersectionMerger.merge(RegionFactory.java:267)
at org.hipparchus.geometry.partitioning.BSPTree.merge(BSPTree.java:437)
at org.hipparchus.geometry.partitioning.BSPTree.merge(BSPTree.java:455)

[maisonobe]

Could you set up a standalone test case allowing to reproduce the issue?

[Sohnny0]

Could you set up a standalone test case allowing to reproduce the issue?

I have been busy recently, so I have solved it in this way for the time being. I will provide test cases later when I have time.

    public BSPTree<S> fixNode(final BSPTree<S> node) {
        Object attribute = node.getPlus().getAttribute();
        if (attribute != null && attribute.equals(node.getMinus().getAttribute())) {
            // no ambiguity
            return new BSPTree<S>(node.getPlus().getAttribute());
        } else {
            // ambiguous node
            return new BSPTree<S>(inside);
        }
    }