Best open source API for java integration

Offer me the best open source API for integrating with a java application. It mainly collects and stores some data. This collected data should be drawn on a graph, such as the average data flow, the average value per week ... The API should support extensive types of graphs, such as a bar graph, pie chart, user chart, etc.,

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JFreeChart is definitely good. You might find the following resources useful for understanding how to get started.

Gantt chart http://sanjaal.com/java/?p=343

Three-dimensional diagram of the category http://sanjaal.com/java/?p=321

Three-dimensional circular diagram http://sanjaal.com/java/?p=318

Go through the API documentation. You will definitely find it useful.

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I used the JFreeChart library for my graphics needs. However, you still need to take care of saving the data.

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