Abdelkrim Hadjidj, yes you can do it if you know what you want to extract. This code will help if user want to load the attribute from json file , so that the attribute value is not hardcoded in the flow.xml. Often some values can be kept in variable for specific environment , eg : Dev , Test , Prod. and these can be separated out in a json file which will not change with the updates in the flow.xml With the latest version of nifi (variable registry ) this is not required. My intention is just to show the need for the same.
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