Ticket #14650: Avoid_IAE_when_converting_3-nodes_way_to_LinearRing.patch

src/org/openstreetmap/josm/plugins/jts/JTSConverter.java

@@ -90 +90 @@
         CoordinateSequence coordSeq = convertNodesToCoordinateSequence(way.getNodes());
 
         // TODO: need to check tags to determine whether area or not
-        if (way.isClosed()) {
+        if (way.isClosed() && way.getNodesCount() >= 4) {
             LinearRing ring = new LinearRing(coordSeq, getGeometryFactory());
             return new Polygon(ring, null, getGeometryFactory());
         } else {