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DropDownList value changes

 
Greenhorn
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I am working on a web application which has 2 dropdown lists.First i chose value for the first dropdownlist and then go to second dropdownlist to select a value.When a value comes to 2nd dropdownlist value in 1st dropdownlist is set to null giving error "statement parameter 1 is not set." this value is set to null in 1st dropdownlist value process change event. i am using java netbeans 5.5. Pls help

thanks
 
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