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Data loading through cache ERROR

 
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I use a cache to load data to my table.Here I refresh my cache for every 5 seconds. My problem is some times my data shows as null whether my cache is not empty.But some times it shows all my data.(IT HAPPENS TIME TO TIME )

this is way that I initialize my cache



I use validation like this before load data to the table,



I  found that when I debug the program my cache is empty.But this validation shows false.So empty data list is loading to the table.(Empty table) I check with the cache size too. Then I found if my cache shows empty but the size has a value. I couldn't find a way to ged rid of this issue.can some one help me to get out from this ???
 
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