Best open sources java web graph library for drawing graphs on jsp webpage

I have found different API's for graphs in which amCharts uses JavaScript/HTML5 have LIVEEDITOR which supports all browsers so powerfull and have motion-charts which change data at run time by default can export charts as images or PDF files.

JSCharts:

JS Charts is a JavaScript based chart generator that requires little or no coding. With JS Charts drawing charts is a simple and easy task, since you only have to use client-side scripting (i.e. performed by your web browser). No additional plugins or server modules are required. Just include our scripts, prepare your chart data in XML, JSON or JavaScript Array and your chart is ready!

http://www.jscharts.com/free-download

JQPlot :

JqPlot is a plotting and charting plugin for the jQuery Javascript framework. jqPlot produces beautiful line, bar and pie charts with many features:

• Numerous chart style options.
• Date axes with customizable formatting.
• Up to 9 Y axes.
• Rotated axis text.
• Automatic trend line computation.
• Tooltips and data point highlighting.
• Sensible defaults for ease of use.

   http://www.jqplot.com/

amCharts:

We offer JavaScript/HTML5 charts for most of your needs. The set includes serial (column, bar, line, area, step line, step without risers, smoothed line, candlestick and ohlc graphs), pie/donut, radar/polar, y/scatter/bubble, Funnel/Pyramid charts and Angular Gauges. Our charts offer unmatched functionality and performance in a modern, standards compliant package. Our JS charting library is responsive and supported by touch/mobile devices.

http://www.amcharts.com/javascript-charts/.