java.rmi.UnmarshalException:错误解组返回；嵌套的异常是:java.lang.ClassNotFoundException: [英] java.rmi.UnmarshalException: error unmarshalling return; nested exception is:java.lang.ClassNotFoundException:
问题描述
我有以下情况:
使用RMI，我注意到在特定情况下，RMI客户端没有通过RMI发送其实例的类.因此，我以Byte []的形式发送了该类，然后使用我定义的类加载器加载了该类.
Using RMI, i noticed that under a specific situation, the RMI client did not have the class whose instance was sent via RMI. So, I sent the class in the shape of Byte [] and then loaded it with a class loader i defined.
客户端中的代码如下:
pp = plugins.getPanelClasses(); //RMI method
panelClassLoader pcl = new panelClassLoader(); //simple class loader defined by me
String name = pcl.defineClass(pp);
然后，我在客户端询问所加载类的实例:
Then, i ask in the client side by the instance of the class loaded:
HashMap<String, PluginPanel> panels = null;
try
{
panels = plugins.getSettingsPanels();
} catch (RemoteException ex)
{
Logger.getLogger(ServerOptions.class.getName()).log(Level.SEVERE, null, ex);
}
PluginPanel是一个接口，其实现类并不总是在客户端中...
PluginPanel is an interface whose implementing classes are not always in the client...
和类加载器是:
private class panelClassLoader extends ClassLoader
{
public panelClassLoader(ClassLoader parent)
{
super(parent);
}
public panelClassLoader()
{
super(getSystemClassLoader());
}
public String defineClass(byte[] b)
{
Class c = super.defineClass(null, b, 0, b.length);
resolveClass(c);
return c.getName();
}
}
尽管如此，我仍然遇到以下错误:java.rmi.UnmarshalException:错误解组返回；嵌套的异常是:java.lang.ClassNotFoundException:pt.ua.dicoogle.IndexPlugin.CPanel(无安全管理器:禁用RMI类加载器)在sun.rmi.server.UnicastRef.invoke(UnicastRef.java:178)在java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:178)在java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:132)在$ Proxy22.getSettingsPanels(未知来源)在pt.ua.dicoogle.rGUI.client.windows.ServerOptions.(ServerOptions.java:176)
Nevertheless, I'm stuck with the following error: java.rmi.UnmarshalException: error unmarshalling return; nested exception is: java.lang.ClassNotFoundException: pt.ua.dicoogle.IndexPlugin.CPanel (no security manager: RMI class loader disabled) at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:178) at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:178) at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:132) at $Proxy22.getSettingsPanels(Unknown Source) at pt.ua.dicoogle.rGUI.client.windows.ServerOptions.(ServerOptions.java:176)
由以下原因引起:java.lang.ClassNotFoundException:pt.ua.dicoogle.IndexPlugin.CPanel(无安全管理器:禁用RMI类加载器)在sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:375)在sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:165)在java.rmi.server.RMIClassLoader $ 2.loadClass(RMIClassLoader.java:620)在java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:247)在sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:197)在java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1574)在java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495)在java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731)在java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)在java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)在java.util.HashMap.readObject(HashMap.java:1030)在sun.reflect.NativeMethodAccessorImpl.invoke0(本机方法)处在sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)在sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)在java.lang.reflect.Method.invoke(Method.java:597)在java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)在java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)在java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)在java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)在java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)在sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:306)在sun.rmi.server.UnicastRef.invoke(UnicastRef.java:155)
Caused by: java.lang.ClassNotFoundException: pt.ua.dicoogle.IndexPlugin.CPanel (no security manager: RMI class loader disabled) at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:375) at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:165) at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:620) at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:247) at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:197) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1574) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350) at java.util.HashMap.readObject(HashMap.java:1030) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350) at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:306) at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:155)
有任何建议吗?
推荐答案
您必须在该类加载器的上下文中调用远程方法.这不是一个好的计划.很好地了解RMI代码库功能，它是专门为这种情况而设计的.
You would have to call the remote method in the context of that class loader. Not a good scheme. Have a good look at the RMI codebase feature, it is designed for exactly this situation.
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