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Primaces dataTable does'nt get selectedRow when it is filled after research

 
Carrow kalala
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hello everybody I'm working on my project with java EE and primefaces, I have a dataTable which is filled after a research but my problem is when I click on table  to select row they send me a message null please can somebody assist me I have no hope

this is my code

 
 
Carrow kalala
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you must  add @ViewScoped
 
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