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How to pass subDataset in list component

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I am new in Jasper report 


In my project I have use the version of jasper report is 6.3.1 and take a datasource as json data sorce.

In my report designing portion I have created one subDataset and take one list component . Now i want to use that subDataset  into my list component so how this task is achive.

I have try to take dataSourceExpression like :


but its produce the exception like 

Caused by: java.lang.ClassCastException: net.sf.jasperreports.engine.JREmptyDataSource cannot be cast to net.sf.jasperreports.engine.data.JsonDataSource

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