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Not able to displaydialog content when selection is enabled in primefaces datatable  RSS feed

Raghu Sundar
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Chrome Eclipse IDE Java
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I am trying to display dialog popup containing input text area on click of a command button in one of the column using the approach shown in showcase example .In my case the datatable is a multiple selection enabled with the implementation of datamodel.The pop-up with text area only appears when the datatable has same feature as shown in the showcase but when multiple selection is implemented (with or without datamodel implementation)nothing gets displayed in the text area and i get the following exception when i check a row and click on the command button.When i directly click on command button no exception is thrown.

My JSF page snippet

My managed bean

Is there any way using which i can display the content in dialog text area?
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