CODEWITHSUNDEEP
javarmi
zhongwei
zhongwei

Reputation: 335

About java RMI. How to use LocateRegistry to getRegistry in a remote host with specified port?

I'm studying java RMI. It's OK to register a Registry in localhost. But how can I register a Registry in a remote host with specified port?

It's OK to execute this code like 

    LocateRegistry.createRegistry(6600);
    // Register communication route
    Naming.rebind("rmi://0.0.0.0:6600/PersonService", personService);

But not like 

    LocateRegistry.getRegistry("202.114.70.31", 6600);
    // Register communication route
    Naming.rebind("rmi://202.114.70.31:6600/PersonService", personService);

Otherwise a ConnectionException will be thrown.

Upvotes: 1

Views: 6049

Answers (1)

user207421
user207421

Reputation: 310850

how can I register a Registry in a remote host with specified port?

You can't. You can only start a Registry in the localhost.

It's OK to execute this code like

LocateRegistry.createRegistry(6600);
// Register communication route
Naming.rebind("rmi://0.0.0.0:6600/PersonService", personService);

It's not OK. You can't connect to 0.0.0.0. It should be "localhost".

But not like

LocateRegistry.getRegistry("202.114.70.31", 6600);

Now that is OK. But, LocateRegistry.getRegistry() doesn't create a Registry. It gives you a stub to an existing Registry, or to nothing if that Registry doesn't actually exist. And note that the call won't fail if it doesn't, but using that stub will fail if it doesn't.

Naming.rebind("rmi://202.114.70.31:6600/PersonService", personService);

And this is not OK. You can only bind/rebind/unbind to a Registry running in the localhost. See the Javadoc.

Otherwise a ConnectionException will be thrown.

No, a java.rmi.ConnectException is thrown, and by the rebind(), not by the getRegistry().

Upvotes: 2

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