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DisplayTag table external sorting problem

 
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Hello dear members,

I am using displayTag for pagination and sorting. I want the rows to get sorted asc/desc when i click on the column title.
my display Table code is as bellow:


there are more columns as well.

in the Action class- i have the following code to read according which column it will get sorted:



now when i print sortBy- it always prints null. means no value has been read from the parameter.

can anyone please point me out if i am doing some mistake? or if any changes needed?

thanks in advance
 
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