热加载问题，求大神帮助看看~拜托了?报错

我的程序如下：

package classloader;


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


public class ReloaderClass extends ClassLoader {
 private String classpath;
 private String className = "com.hgf.Cifa";


 public ReloaderClass(String classpath) {
 this.classpath = classpath;
 }


 protected Class findClass(String name) throws ClassNotFoundException {
 Class aClass= findLoadedClass(name);
 if(aClass!=null){
 return aClass;
 }else{
 byte[] classData = getData(name);
 if (classData == null) {
 throw new ClassNotFoundException();
 } else {
 return defineClass(this.className, classData, 0, classData.length);
 }
 }
 }


 private byte[] getData(String className) {
 String path = this.classpath+className;
 try {
 InputStream in = new FileInputStream(path);
 ByteArrayOutputStream stream = new ByteArrayOutputStream();
 byte[] buffer = new byte[1024];
 int num = 0;
 while ((num = in.read(buffer)) != -1) {
 stream.write(buffer, 0, num);
 }
 return stream.toByteArray();
 } catch (FileNotFoundException e) {
 e.printStackTrace();
 } catch (IOException e) {
 e.printStackTrace();
 }
 return null;
 }


 public static void main(String[] args) {
 try {
 ReloaderClass reloader = new ReloaderClass("E:/com/hgf/");
 Class r = reloader.findClass("Cifa.class");
 System.out.println(r.newInstance());
 System.out.println("再次加载");
 ReloaderClass reloader2 = new ReloaderClass("E:/com/hgf/");
 Class r2 = reloader.findClass("Cifa.class");
 System.out.println(r2.newInstance());
 } catch (ClassNotFoundException e) {
 e.printStackTrace();
 } catch (InstantiationException e) {
 e.printStackTrace();
 } catch (IllegalAccessException e) {
 e.printStackTrace();
 }
 }


}


 

 
 

报错如下：

Cifa@1012ddd
再次加载
Exception in thread "main" java.lang.LinkageError: loader (instance of  classloader/ReloaderClass): attempted  duplicate class definition for name: "Cifa"
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:642)
	at classloader.ReloaderClass.loadClass(ReloaderClass.java:29)
	at classloader.ReloaderClass.main(ReloaderClass.java:60)

为什么