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Thowing to many errors

 
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Hi All,
When I run this code and I select a table with an 0 at the beggining it thows a Exception which is fine but when I click into the comboBox where I selected the table it thows the exception again.
Why does it thow the Exception twice and is there a way where I can have it thown only once.
Also is there a way where you can have a diffrent JOption pane (error message) pop up for every diffrent Exception that is thown?


Thanks
ben
 
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