java NullPointerException existed Image -

what want when user selects image, image must copied specific folder , use image.

this use copy image:

files.copy(     paths.get("c:/../img.png"),     paths.get("c:/../src/bgs").resolve(array[array.length-1]),     standardcopyoption.replace_existing); 

which works fine. problem if use image after command, nullpointerexception (i don't have problem if use thread.sleep(2500) between 2 commands). need way check if file ready used.

so far used following code

// copy file file f = new file(new_path); sout(f.exists()); // use file image background = toolkit.getdefaulttoolkit().getimage(     getclass().getresource("/bgs/img.png")); 

which prints true, when use nullpointerexception again.. ideas?

exception:

uncaught error fetching image: java.lang.nullpointerexception     @ sun.awt.image.urlimagesource.getconnection(urlimagesource.java:115)     @ sun.awt.image.urlimagesource.getdecoder(urlimagesource.java:125)     @ sun.awt.image.inputstreamimagesource.dofetch(inputstreamimagesource.java:263)     @ sun.awt.image.imagefetcher.fetchloop(imagefetcher.java:205)     @ sun.awt.image.imagefetcher.run(imagefetcher.java:169) 

i solved problem, in case else faced this, here did:

replace

toolkit.getdefaulttoolkit().getimage(getclass().getresource("/bgs/img.png")); 

with

imageio.read(new file("bgs/img.png")); 

be carefull path

"/bgs/img.png"

"bgs/img.png"