需要通過引導類加載器

我已經包含類的.class數據byte[]（從文件系統加載）

而且我還有一個這個類的一些對象的以前序列化爲其他流的byte[]。

先做加載.class文件，我自定義的類裝載器是的byte[]：

public class MainSearchClassLoader extends ClassLoader 
{ 

    public MainSearchClassLoader() 
    { 
     super(MainSearchClassLoader.class.getClassLoader()); 
    } 

    public Class<?> findClass(String name) throws ClassNotFoundException 
    { 
     try 
     { 
      byte[] bytecode = FileUtil.readClassByteCode(); 
      return super.defineClass(ReflectionUtil.getStubBinaryClassName() , bytecode, 0, bytecode.length); 
     } catch (IOException e) 
     { 
      e.printStackTrace(); 
     } 
     return null; 
    } 
}

然後我嘗試使用下面的代碼以反序列化此實例：

public static Object getObjectFromBytes(final byte[] bytes) 
    { 
     Object object = null; 
     try 
     { 
      object = new ObjectInputStream(new ByteArrayInputStream(bytes)).readObject(); 
     } catch (final Exception ioe) 
     { 
      ioe.printStackTrace(); 
     } 
     return object; 
    }

這需要序列化的字節，並應該返回實例（使用我的自定義類加載器的預加載類）。我得到以下異常：

11/03/06 14:23:27 oracle.classloader.util.AnnotatedClassNotFoundException: 

     Missing class: mainSearchObjects.dc_index 

    Dependent class: java.io.ObjectInputStream 
      Loader: jre.bootstrap:1.5.0_06 
     Code-Source: unknown 
     Configuration: jre bootstrap 

This load was initiated at MainSearch.web.MainSearch:0.0.0 using the Class.forName() method. 

The missing class is not available from any code-source or loader in the system. 
11/03/06 14:23:27 at oracle.classloader.PolicyClassLoader.handleClassNotFound (PolicyClassLoader.java:2068) [/D:/jdevstudio10134/j2ee/home/lib/pcl.jar (from system property java.class.path), by [email protected]] 
    at oracle.classloader.PolicyClassLoader.internalLoadClass (PolicyClassLoader.java:1679) [/D:/jdevstudio10134/j2ee/home/lib/pcl.jar (from system property java.class.path), by [email protected]] 
    at oracle.classloader.PolicyClassLoader.loadClass (PolicyClassLoader.java:1635) [/D:/jdevstudio10134/j2ee/home/lib/pcl.jar (from system property java.class.path), by [email protected]] 
    at oracle.classloader.PolicyClassLoader.loadClass (PolicyClassLoader.java:1620) [/D:/jdevstudio10134/j2ee/home/lib/pcl.jar (from system property java.class.path), by [email protected]] 
    at java.lang.ClassLoader.loadClassInternal (ClassLoader.java:319) [jre bootstrap, by jre.bootstrap:1.5.0_06] 
    at java.lang.Class.forName0 (Native method) [unknown, by unknown] 
    at java.lang.Class.forName (Class.java:242) [jre bootstrap, by jre.bootstrap:1.5.0_06] 
    at java.io.ObjectInputStream.resolveClass (ObjectInputStream.java:574) [jre bootstrap, by jre.bootstrap:1.5.0_06] 
    at java.io.ObjectInputStream.readNonProxyDesc (ObjectInputStream.java:1538) [jre bootstrap, by jre.bootstrap:1.5.0_06] 
    at java.io.ObjectInputStream.readClassDesc (ObjectInputStream.java:1460) [jre bootstrap, by jre.bootstrap:1.5.0_06] 
    at java.io.ObjectInputStream.readOrdinaryObject (ObjectInputStream.java:1693) [jre bootstrap, by jre.bootstrap:1.5.0_06] 
    at java.io.ObjectInputStream.readObject0 (ObjectInputStream.java:1299) [jre bootstrap, by jre.bootstrap:1.5.0_06] 
    at java.io.ObjectInputStream.readObject (ObjectInputStream.java:339) [jre bootstrap, by jre.bootstrap:1.5.0_06] 
...........

我明白了。去調用代碼使用的引導類加載器無法看到它的一個子類（我的類加載器）加載的類，我認爲這是一個正確的方法，不是它？

所以，是不是解決這個問題？

來源

2011-03-06 Muhammad Hewedy