Dynamic loading of Native code embedded in a jar

ant_build_snippet.xml

<copy file="src/com/amcclosky/nativelib/libJNINativeLibrary.so" todir="bin/com/amcclosky/nativelib"/>

NativeLibrary.java

package com.amcclosky.nativelib;

import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

public class NativeLibrary {
    public static final long NULL = 0;
    protected static final Logger log = Logger.getLogger(Peer.class.getPackage().getName());
    
    static {
    	if(System.getProperty("os.name").compareTo("Linux") != 0) {
    		System.loadLibrary("JNINativeLibrary");
    
    	} else {
    		NativeLibrary.loadLinuxLibrary();
    	}
    }

   /**
    * Copy a resorce to a file.
    * 
    * @param clss
    * @param resource
    * @param toFile
    * @throws IOException
    */
   public static void copyResourceToFile(Class clss, String resource, File toFile) throws IOException {
      InputStream input = clss.getResourceAsStream(resource);
      if (input == null)
         throw new IllegalArgumentException("Could not get resource " + resource + " from class " + clss.getName());
      else {
         OutputStream output = null;
         IOException ioe = null;
         try {
            output = new FileOutputStream(toFile);
            byte b[] = new byte[10 * 1024];
            int n;
            while ((n = input.read(b)) > 0)
               output.write(b, 0, n);
         } catch (IOException e) {
            ioe = e;
         } finally {
            if (input != null)
               try {
                  input.close();
               } catch (IOException e) {
                  ioe = e;
               }
            if (output != null)
               try {
                  output.close();
               } catch (IOException e) {
                  ioe = e;
               }
            if (ioe != null)
               throw ioe;
         }
      }
   }
    
    public static void loadLinuxLibrary() {
       	File nativeLib = new File( System.getProperty("user.home") + "/.nativelibrary/" + "libJNINativeLibrary.so");
    	if(!nativeLib.exists()) { 
    		try {
				NativeLibrary.copyResourceToFile(NativeLibrary.class, "libJNINativeLibrary.so", nativeLib);
			} catch (IOException e) {
				log.log(Level.SEVERE, "Unable to load native library.", e);
			}
    	}
    	
    	System.load(nativeLib.getAbsolutePath());
    }
    
    /* JNI method stubbs go here. */
 
}