在学习RMI的时候，首先启动了服务端，然后再启动客户端，在启用客户端的时候报错，如下：

Exception in thread "main" java.rmi.UnmarshalException: error unmarshalling return; nested exception is:

java.lang.ClassNotFoundException: com.RMIServerDemo01.IRemoteObj (no security manager: RMI class loader disabled)

at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)

at com.RMIClientDemo01.RMIClient.main(RMIClient.java:11)

Caused by: java.lang.ClassNotFoundException: com.RMIServerDemo01.IRemoteObj (no security manager: RMI class loader disabled)

at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:556)

at java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:646)

at java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:311)

at sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:255)

at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1559)

at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1515)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1774)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)

at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)

... 2 more

RMI报错：no security manager: RMI class loader disabled_RMI class

经过查询，主要有两个原因，如下是处理过程：

1、客户端及服务端的接口要手工抛出异常：RemoteException，如下：

RMI报错：no security manager: RMI class loader disabled_RegistryImpl_02

 2、客户端与服务端的包结构要保持一致

这是报错的：

RMI报错：no security manager: RMI class loader disabled_RegistryImpl_03

这是调整后正常的：

RMI报错：no security manager: RMI class loader disabled_Stub.lookup_04

 经过以上两步就解决了，记录一下。