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[netcdf-java] i coded a program at netbeans for wrfout file but i am facing with this message "heap space error"

hi everyone
i am new at WRF
i coding a program that gets a couple variable   from .nc(wrfout) file.
it works fine when the file is small but if wrfout file is large
approximately 13 GB  then netbeans show an error "java heap space"
i can not find any solution

i use windows 7 and netbeans 6.8.

thanks ........................