How can you make idle processors pick up java work?

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 Well, this I have tried also, but I am getting java.lang.OutOfMemoryError:
Java heap space relating to the HeapCharBuffer
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import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.nio.channels.FileChannel;
import java.nio.MappedByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;
import java.nio.charset.CharacterCodingException;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.FileInputStream;

// __
public class NIO06Test{
 private static final String aNWLn = System.getProperty("line.separator");
 private static final String aOEnc = "UTF-8";
// __
 public static void main(String[] aArgs){
  if((aArgs != null) && (aArgs.length == 1)){
// __
   long lTm00 = System.currentTimeMillis();

   Path IFlPth = FileSystems.getDefault().getPath(aArgs[0]);
   File IFl = IFlPth.toFile();
   if(IFl.exists()){
    long lIFlL = IFlPth.toFile().length();
// __
    Charset InChrSt = Charset.forName(aOEnc);
    CharsetDecoder InDec = InChrSt.newDecoder();
    InDec.onMalformedInput(CodingErrorAction.REPORT);
    InDec.onUnmappableCharacter(CodingErrorAction.REPORT);
// __
    try{
// __
     FileInputStream FIS = new FileInputStream(IFl);
     FileChannel IFlChnl = FIS.getChannel();
     int iChnlSz = (int)IFlChnl.size();
     MappedByteBuffer MptBytBfr = IFlChnl.map(FileChannel.MapMode.READ_ONLY,
0, iChnlSz);
     CharBuffer MptChrBfr = InDec.decode(MptBytBfr);
// __
    }catch(CharacterCodingException ChrKdX){ ChrKdX.printStackTrace(); }
     catch(FileNotFoundException FNFX){ FNFX.printStackTrace(); }
      catch(IOException IOX){ IOX.printStackTrace(); }
   }
  }
  else{ System.err.println("// __ usage:" + aNWLn + aNWLn + " java
NIO2_newBufferedReader02Test \"<text file>\"" + aNWLn); }
 }
}
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$ javac -encoding utf8 NIO06Test.java
$ date; java -Xms256m -Xmx1024m -Xincgc -Dfile.encoding=utf8 NIO06Test
/media/sdb1/tmp/eng_news_2006_10M-sentences.txt; date;
Tue Jul 31 08:26:49 UTC 2012
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
 at java.nio.HeapCharBuffer.<init>(HeapCharBuffer.java:57)
 at java.nio.CharBuffer.allocate(CharBuffer.java:331)
 at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:777)
 at NIO06Test.main(NIO06Test.java:105)
Tue Jul 31 08:26:49 UTC 2012
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 lbrtchx