How to generate jpeg file

hi, i just learn how to use jfreechart
but when i compile , it says : couldnt find the main class
and throws exception 'main'
this is part of the code
JFreeChart chart = ChartFactory.createBarChart
("Sample Category Chart", // Title
"Quarters", // X-Axis label
"Sales", // Y-Axis label
categoryDataset,
PlotOrientation.VERTICAL,
true,// Dataset
true,true // Show legend
ChartUtilities.saveChartAsJPEG(new File("chart.jpg"), chart, 500, 300);

Would you be so kind to copy the compiler diagnostic message verbatim
and post it here, because as it is, your question doesn't make much sense.
kind regards,
Jos

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How to generate MT100 file in XML ?

How to generate MT100 file in XML ?
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How to generate jpeg file

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