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With vaadin chart 2.1.3 I was able to serialize the chart configuration by callingchart.getConfiguration.toString()and than saving the json string to the database.
Now with vaadin chart 3.0.0 the toString method is no more redefined by AbstractConfigurationObject and I don't understand how to save the configuration.
I haven't tried, but there is
static String toJSON(AbstractConfigurationObject object)
Thank you, that's exactly what I was looking for.