Java ImageIO.write() Runtime Exception -


i trying follow example here: http://docs.oracle.com/javase/tutorial/displaycode.html?code=http://docs.oracle.com/javase/tutorial/essential/concurrency/examples/forkblur.java 

/* * copyright (c) 2010, 2013, oracle and/or affiliates. rights reserved. * * redistribution , use in source , binary forms, or without * modification, permitted provided following conditions * met: * *   - redistributions of source code must retain above copyright *     notice, list of conditions , following disclaimer. * *   - redistributions in binary form must reproduce above copyright *     notice, list of conditions , following disclaimer in *     documentation and/or other materials provided distribution. * *   - neither name of oracle or names of *     contributors may used endorse or promote products derived *     software without specific prior written permission. * * software provided copyright holders , contributors "as * is" , express or implied warranties, including, not limited to, * implied warranties of merchantability , fitness particular * purpose disclaimed.  in no event shall copyright owner or * contributors liable direct, indirect, incidental, special, * exemplary, or consequential damages (including, not limited to, * procurement of substitute goods or services; loss of use, data, or * profits; or business interruption) caused , on theory of * liability, whether in contract, strict liability, or tort (including * negligence or otherwise) arising in way out of use of * software, if advised of possibility of such damage. */  import java.awt.image.bufferedimage; import java.io.file; import java.util.concurrent.forkjoinpool; import java.util.concurrent.recursiveaction; import javax.imageio.imageio;  /**  * forkblur implements simple horizontal image blur. averages pixels in  * source array , writes them destination array. sthreshold value  * determines whether blurring performed directly or split 2  * tasks.  *  * not recommended way blur images; intended  * illustrate use of fork/join framework.  */ public class forkblur extends recursiveaction {      private int[] msource;     private int mstart;     private int mlength;     private int[] mdestination;     private int mblurwidth = 15; // processing window size, should odd.      public forkblur(int[] src, int start, int length, int[] dst) {         msource = src;         mstart = start;         mlength = length;         mdestination = dst;     }      // average pixels source, write results destination.     protected void computedirectly() {         int sidepixels = (mblurwidth - 1) / 2;         (int index = mstart; index < mstart + mlength; index++) {             // calculate average.             float rt = 0, gt = 0, bt = 0;             (int mi = -sidepixels; mi <= sidepixels; mi++) {                 int mindex = math.min(math.max(mi + index, 0), msource.length - 1);                 int pixel = msource[mindex];                 rt += (float) ((pixel & 0x00ff0000) >> 16) / mblurwidth;                 gt += (float) ((pixel & 0x0000ff00) >> 8) / mblurwidth;                 bt += (float) ((pixel & 0x000000ff) >> 0) / mblurwidth;             }              // re-assemble destination pixel.             int dpixel = (0xff000000)                     | (((int) rt) << 16)                     | (((int) gt) << 8)                     | (((int) bt) << 0);             mdestination[index] = dpixel;         }     }     protected static int sthreshold = 10000;      @override     protected void compute() {         if (mlength < sthreshold) {             computedirectly();             return;         }          int split = mlength / 2;          invokeall(new forkblur(msource, mstart, split, mdestination),                 new forkblur(msource, mstart + split, mlength - split,                  mdestination));     }      // plumbing follows.     public static void main(string[] args) throws exception {         string srcname = "awesome_face.jpg";         file srcfile = new file(srcname);         bufferedimage image = imageio.read(srcfile);          system.out.println("source image: " + srcname);          bufferedimage blurredimage = blur(image);          string dstname = "blurred-awesome-face.jpg";         file dstfile = new file(dstname);         imageio.write(blurredimage, "jpg", dstfile);          system.out.println("output image: " + dstname);      }      public static bufferedimage blur(bufferedimage srcimage) {         int w = srcimage.getwidth();         int h = srcimage.getheight();          int[] src = srcimage.getrgb(0, 0, w, h, null, 0, w);         int[] dst = new int[src.length];          system.out.println("array size " + src.length);         system.out.println("threshold " + sthreshold);          int processors = runtime.getruntime().availableprocessors();         system.out.println(integer.tostring(processors) + " processor"                 + (processors != 1 ? "s " : " ")                 + "available");          forkblur fb = new forkblur(src, 0, src.length, dst);          forkjoinpool pool = new forkjoinpool();          long starttime = system.currenttimemillis();         pool.invoke(fb);         long endtime = system.currenttimemillis();          system.out.println("image blur took " + (endtime - starttime) +                  " milliseconds.");          bufferedimage dstimage =                 new bufferedimage(w, h, bufferedimage.type_int_argb);         dstimage.setrgb(0, 0, w, h, dst, 0, w);          return dstimage;     } }

i copied code computer , compiled , ran , received following error:

source image: awesome_face.jpg array size 100000 threshold 10000 4 processors available image blur took 19 milliseconds. exception in thread "main" javax.imageio.iioexception: invalid argument native writeimage     @ com.sun.imageio.plugins.jpeg.jpegimagewriter.writeimage(native method)     @ com.sun.imageio.plugins.jpeg.jpegimagewriter.writeonthread(jpegimagewriter.java:1058)     @ com.sun.imageio.plugins.jpeg.jpegimagewriter.write(jpegimagewriter.java:360)     @ javax.imageio.imagewriter.write(imagewriter.java:615)     @ javax.imageio.imageio.dowrite(imageio.java:1612)     @ javax.imageio.imageio.write(imageio.java:1536)     @ forkblur.main(forkblur.java:112)

it looks problem @ line 112 in imageio.write() method. looked @ api method here: http://docs.oracle.com/javase/7/docs/api/javax/imageio/imageio.html understanding arguments write() okay messed @ runtime.

does know wrong program?

regards,

...


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