java - File Not found exception on different Machine -

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i trying access file opt/app/db/vat/form_data_30.xls. works fine on machine shows exception on other machine on application installed. here code

string filename="opt/app/db/vat/form_dvat_30.xls"; file selectedfile=new file(filename);

physically .xls file exist inside opt/app/db/vat directory.and users have permission of read write well. mine runnable jar app.jar stored @ /opt/app/app.jar

if use string filename="opt/app/db/vat/form_dvat_30.xls"; relative execution folder.

for example if programe executed /home/user/ file should in /home/user/opt/app/db/vat/form_dvat_30.xls

if want access /opt/app/db/vat/form_dvat_30.xls use string filename="/opt/app/db/vat/form_dvat_30.xls";


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