/rmi-samples

rmi dome

Primary LanguageJava

rmi-samples

rmi dome

创建rmi服务步骤

  1. 建立一个 API (interface类),该类继承 Remote
  2. 建立一个 provider 实现 API
  3. 发布服务
    1. 发布服务钱需要启动注册中心,可通过 LocateRegistry.createRegistry(port) 启动
    2. 通过 Naming.rebind 注册服务
  4. 建立一个 consumer 通过 Naming.lookup 获取服务

java的 rmi使用过程中若遇的问题，可以尝试如下的解决方法

错误 1 ：

java.rmi.server.ExportException: remote object implements illegal remote interface; nested exception is: 
	java.lang.IllegalArgumentException: illegal remote method encountered: public abstract java.lang.String my.rmi.samples.api.Hello.sayHi(java.lang.String)
	at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:225)
	at java.rmi.server.UnicastRemoteObject.exportObject(UnicastRemoteObject.java:383)
	at java.rmi.server.UnicastRemoteObject.exportObject(UnicastRemoteObject.java:320)
Caused by: java.lang.IllegalArgumentException: illegal remote method encountered: public abstract java.lang.String my.rmi.samples.api.Hello.sayHi(java.lang.String)
	at sun.rmi.server.Util.checkMethod(Util.java:267)
	at sun.rmi.server.Util.getRemoteInterfaces(Util.java:246)
	at sun.rmi.server.Util.getRemoteInterfaces(Util.java:216)
	at sun.rmi.server.Util.createProxy(Util.java:146)
	at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:223)

解决方法 ：若提示这样的错误说明接口函数未设置异常抛出，在所提示的函数后面加上throw RemoteException即可解决

错误 2：exception:

java.rmi.MarshalException: error marshalling arguments; nested exception is: 
	java.io.NotSerializableException: my.rmi.samples.provider.HelloImpl
	at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
	at java.rmi.Naming.rebind(Naming.java:177)
	at my.rmi.samples.provider.HelloImplTest.sayHi(HelloImplTest.java:28)
Caused by: java.io.NotSerializableException: my.rmi.samples.provider.HelloImpl
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)

解决方法：若提示这样的错误说明某个类是不能序列化的，需要在该类实现加上implements Serializable，或者 extends UnicastRemoteObject 即可解决