No Graphs displayed in Aggregate Report/Response Time Graph

Make sure, that we scale away from zero (which is in our case mostly up).
Otherwise we might end up with a scaling factor of zero, which would
result in really small images.

Bugzilla Id: 65784

src/components/src/main/java/org/apache/jmeter/visualizers/AxisGraph.java

@@ -399,7 +399,7 @@ private void drawSample(String _title, int _maxLength, String[] _xAxisLabels,
             // Y Axis
             try {
                 BigDecimal round = BigDecimal.valueOf(max / 1000d);
-                round = round.setScale(0, RoundingMode.HALF_EVEN);
+                round = round.setScale(0, RoundingMode.UP);
                 double topValue = round.doubleValue() * 1000;
                 yaxis.setUserDefinedScale(0, 500);
                 yaxis.setNumItems((int) (topValue / 500)+1);

src/components/src/main/java/org/apache/jmeter/visualizers/RespTimeGraphChart.java

@@ -282,7 +282,7 @@ private void drawSample(String _title, String[] _xAxisLabels,
             double[][] _data, int _width, int _height, int _incrScaleYAxis,
             Color[] _color, Font legendFont, Graphics g) {
 
-        double max = maxYAxisScale > 0 ? maxYAxisScale : getTopValue(findMax(_data), RoundingMode.HALF_EVEN); // define max scale y axis
+        double max = maxYAxisScale > 0 ? maxYAxisScale : getTopValue(findMax(_data), RoundingMode.UP); // define max scale y axis
         try {
             // if the title graph is empty, we can assume some default
             if (_title.length() == 0 ) {
@@ -332,7 +332,7 @@ private void drawSample(String _title, String[] _xAxisLabels,
                 double incrYAxis = max / numInterval;
                 double incrTopValue = _incrScaleYAxis;
                 if (_incrScaleYAxis == 0) {
-                    incrTopValue = getTopValue(incrYAxis, RoundingMode.HALF_EVEN);
+                    incrTopValue = getTopValue(incrYAxis, RoundingMode.HALF_UP);
                 }
                 if (incrTopValue < 1) {
                     incrTopValue = 1.0d; // Increment cannot be < 1

xdocs/changes.xml

@@ -224,6 +224,7 @@ however, the profile can't be updated while the test is running.
 <h3>Listeners</h3>
 <ul>
   <li><bug>64962</bug>Save CSV sub-results recursively from View Results Tree</li>
+  <li><bug>65784</bug>No Graphs displayed in Aggregate Report/Response Time Graph</li>
 </ul>
 
 <h3>Timers, Assertions, Config, Pre- &amp; Post-Processors</h3>