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In the Properties Window if you select a custom row sorter for a JTable component, save and reopen Netbeans, the custom sorter goes back to "default" sorter. Any other modifications results in this field being lost in the generated code the next time. The workaround I found was to turn off the option to "autoCreateRowSorter," but it should be more obvious in the Netbeans Properties window that if you turn on a custom sorter, the autoCreate should be disabled.
I am sorry, I am not able to reproduce this issue. Could you, please, provide _exact_ steps to reproduce. Thank you in advance. I was able to reproduce the reset of the rowSorter property only when you set it and then check autoCreateRowSorter, but this is as it should be (because a new rowSorter is set when autoCreateRowSorter checked).