PLANNER-1540 Fix possible NPE in StatisticsUtils

deyangdianzi · Jun 27, 2019 · 400d9b4 · 400d9b4
1 parent b0114b4
commit 400d9b4
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/...nner-benchmark/src/main/java/org/optaplanner/benchmark/impl/statistic/StatisticUtils.java b/...nner-benchmark/src/main/java/org/optaplanner/benchmark/impl/statistic/StatisticUtils.java
@@ -55,6 +55,11 @@ public static double[] determineStandardDeviationDoubles(
                 }
             }
         }
+
+        if (differenceSquaredTotalDoubles == null) { // no successful benchmarks
+            return new double[0];
+        }
+
         double[] standardDeviationDoubles = new double[differenceSquaredTotalDoubles.length];
         for (int i = 0; i < differenceSquaredTotalDoubles.length; i++) {
             standardDeviationDoubles[i] = Math.pow(differenceSquaredTotalDoubles[i] / successCount, 0.5);