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I don’t see any column with the name ‘file_data’ of the type LONGBLOB in the screenshot that you have shared! Please checkout this tutorial on Saving/Retrieving BLOB object in Spring MVC.
If there is any issue integrating CanvasJS in your Spring MVC project, please download the Sample project from our download page. If you have any other issues, kindly create sample project along with sample database and share it over Google-Drive or Onedrive so that we can look into your code, understand it better and help you out?