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JFreeChart - Not fully visible line chart

I am using JFreeChart library to create Chart on website (library integrated with my application according to this tutorial). Everything looks great except one thing: for some reason, for some data line chart is not completly visible (please see screen).
I don't know why is it happening. I'm posting code responsible for configuration:
public JFreeChart createChart()
{
NumberAxis numberaxis = new NumberAxis("X");
numberaxis.setAutoRangeIncludesZero(false);
NumberAxis numberaxis1 = new NumberAxis("Y");
numberaxis1.setAutoRangeIncludesZero(false);
XYSplineRenderer xysplinerenderer = new XYSplineRenderer();
XYPlot xyplot = new XYPlot(createSampleData(), numberaxis, numberaxis1, xysplinerenderer);
xyplot.setBackgroundPaint(new Color(238, 242, 250));//
xyplot.setDomainGridlinePaint(new Color(238, 242, 250));
xyplot.setRangeGridlinePaint(new Color(238, 242, 250));
xyplot.getRenderer().setSeriesPaint(0, Color.BLUE);
xyplot.setAxisOffset(new RectangleInsets(4D, 4D, 4D, 4D));
XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) xyplot.getRenderer();
renderer.setSeriesShapesVisible(0, true);//FIXME Dots
xyplot.getDomainAxis().setStandardTickUnits(NumberAxis.createIntegerTickUnits());
JFreeChart jfreechart = new JFreeChart("", JFreeChart.DEFAULT_TITLE_FONT, xyplot, true);
jfreechart.setBackgroundPaint(Color.white);
return jfreechart;
}

The link provided by Richard describes the problem well; but, ultimately, it looks like you need to manually set the upper bound of your range axis to account for the upper curve of the spline produced by XYSplineRenderer. For your example above, this might be:
xyplot.getRangeAxis().setUpperBound(22.5);
For practical purposes, you would probably want to calculate the maximum Y value, and either add a percentage to it, or more complicated, calculate a ceiling based on its surrounding points. I would start by adding 10% and see how that goes:
// Iterate data values; use Math.max() to determine maxYValue; then:
xyplot.getRangeAxis().setUpperBound( maxYValue + maxYValue * 0.1);
It's at patch, but it should provide the result you want, depending on the nature of your data and the curves produced connecting data points.

JFreeChart: How to plot a line graph and a scatter on same chart

i have two sets of data
int[] x1 = {1,2,3,4,5,6,7,8,9,10};
int[] y1 = {1,2,3,5,6,8,9,10,14,11};
int[] x2 = {1,2,3,4,5,6,7,8,9,10};
int[] y2 = {0,2,3,5,0,8,9,8,14,11};
int[] z2 = {1,2,3,1,2,3,1,2,3,1};
I want to plot the x1,y1 as an XYLineChart and then plot x2,y2 as a scatter on the same plot without a line.
I also need each scatter point of xy,y2 to be a different color depending on the value of z2 (1=Color.red, 2=Color.green, 3=Color.blue)
How can i do this?
So far i have:
JPanel panel_1 = new JPanel();
panel_1.setLayout(new BorderLayout(0, 0));
XYSeriesCollection dataset = new XYSeriesCollection();
XYSeries series1 = new XYSeries("series1");
for(int i=0; i<x1.length; i++){
series1.add(x1[i],y1[i]);
}
dataset.add(series1);
JFreeChart chart = ChartFactory.createXYLineChart("Title", "x", "y", dataset, PlotOrientation.VERTICAL, false, false, false);
ChartPanel cp = new ChartPanel(chart);
panel_1.add(cp, BorderLayout.CENTER);
This gets the line graph sorted. I now need to code the scatter plot for x2,y2 (with colors described above) which is where im stuck.

The createXYLineChart() method will create a chart that uses an XYLineAndShapeRenderer. So fetch the renderer from the plot and cast it to XYLineAndShapeRenderer. Then you can call the methods setSeriesLinesVisible() and setSeriesShapesVisible() to control, for each series, whether shapes and/or lines are drawn for the data items. That way you can use a single renderer and dataset, which makes things simpler.
Your requirement to change the colors depending on another data value requires a little more work. You should subclass the XYLineAndShapeRenderer class and override the getItemPaint(int, int) method. Here you can return any color you want for a data item. The default implementation looks at the series index and returns the color for the series. You need to look at the item index as well, then do a lookup in your table of z-values and decide what color to return.

Different color for different series in XYline chart JFreeChart

I have created XY line chart using JFreeChart, having two datasets, I want both the lines to be in different colors. I tried using following code-
XYPlot plot = chart.getXYPlot();
XYItemRenderer xyir = plot.getRenderer();
xyir.setSeriesPaint(0, Color.GREEN);
plot.setDataset(0, xyDataset1);
xyir.setSeriesPaint(1, Color.blue);
plot.setDataset(1, xyDataset2);
Also I have tried using following code, where I am using different renderer (don't know whether this is correct way to do it)-
XYPlot plot1 = chart.getXYPlot();
XYPlot plot2 = chart.getXYPlot();
XYItemRenderer xyir1 = plot1.getRenderer();
xyir1.setSeriesPaint(0, Color.GREEN);
plot1.setDataset(0, xyDataset1);
XYItemRenderer xyir2 = plot2.getRenderer();
xyir2.setSeriesPaint(1, Color.blue);
plot2.setDataset(1, xyDataset2);
In both the cases its printing both the lines in blue color.
What's wrong?? Any suggestions??

Found the solution, it works for me, using two different Renderer, earlier i was not doing it properly--
XYPlot plot = chart.getXYPlot();
plot.setDataset(0, xyDataset1);
plot.setDataset(1, xyDataset2);
XYLineAndShapeRenderer renderer0 = new XYLineAndShapeRenderer();
XYLineAndShapeRenderer renderer1 = new XYLineAndShapeRenderer();
plot.setRenderer(0, renderer0);
plot.setRenderer(1, renderer1);
plot.getRendererForDataset(plot.getDataset(0)).setSeriesPaint(0, Color.red);
plot.getRendererForDataset(plot.getDataset(1)).setSeriesPaint(0, Color.blue);

The approach shown works in this example, and a single renderer should be sufficient. An sscce may help isolate the problem.
To control individual items, you can override getItemPaint(), shown here.

Try to set the Series paint to null in the renderer setSeriesPaint(null);
If you take a look at the source it first checks to see if the paint is !null, then uses the base color.
If null it uses the colors associated with the time serie from a lookup table.

How can multiple datasets be used with JFreeChart?

How could I add to a plot an OHLCSeriesCollection and a TimeSeriesCollection , in order to represent their values in the same chart ?

Both OHLCSeriesCollection and TimeSeriesCollection are based on XYDataset so you should be able to add them both to an XYPlot with something like the following:
JFreeChart chart = // create your XY chart here.
XYPlot plot = chart.getXYPlot();
OHLCSeriesCollection ohlsSeriesDataset = // create you ohlc dataset here.
TimeSeriesCollection timeSeriesDataset = // create you time dataset here.
AbstractXYItemRenderer olhsSeriesRenderer = // create your ohlc renderer here.
AbstractXYItemRenderer timeSeriesRenderer = // create your time renderer here.
plot.setDataset(0, ohlsSeriesDataset);
plot.setDataset(1, timeSeriesDataset);
plot.setRenderer(0, olhsSeriesRenderer);
plot.setRenderer(1, timeSeriesRenderer);
The type of renderer to use for olhsSeriesRenderer and timeSeriesRenderer really depends on the type of chart you want to generate so I cannot give you specifics here.
I have not tried this myself with XY datasets, but I have been able to do combine CategoryDatasets using this.

3D chart with Jfreechart

Is it possible to draw a 3D chart using JfreeChart like in the following link.If possible can anyone give some hints and some snippets of code on what parameters of Plot can be used to do this.
link text

It's possible though it won't look exactly the same. The easiest way is to create a dataset (descendant of org.jfree.data.general.PieDataset) and use one of org.jfree.chart.ChartFactory methods:
PieDataset data = new DefaultPieDataset();
data.setValue("Section1", 30);
data.setValue("Section2", 60);
data.setValue("Section3", 120);
JFreeChart pieChart = ChartFactory.createPieChart3D(
"My Pie Chart", // title
data, // data set
true, // draw a legend
true, // show tooltips over sections
false); // do not generate image map with URLs
You can then further customize your chart through pieChart methods. For example, here's how to explode one pie section:
PiePlot plot = (PiePlot) pieChart.getPlot();
plot.setExplodePercent("Section2", 0.25);