RMI server...is it multi-threaded class??

[CyJenny Wong]

Is RMI implictly working in a Multi-thread environment. When multiple client connect to the Server remote object, are they all accessing the same instance of the remote object or different instance. I feel very unclear in this aspect though I have many tutorial abt RMI, but none is clearly explain this.
Please help

[Steve Granton]

Hi,
As far as I'm aware there are as many distinct instances of the remote object that you create and bind to a unique name in the registry.
So for instance. If you bind the same object to two different names in the registry then as far as I gather you are referencing the same object.
So as you say RMI is implicitly multithreaded - clients connect and call methods on the same instance of the remote object. Therefore this object needs to be threadsafe.
I hope this helps,
Cheers,
Steve

[Steve Granton]

Hi,
I found the following in the RMI Architecture and Functional Specification:

A method dispatched by the RMI runtime to a remote object implementation may or may not execute in a separate thread. The RMI runtime makes no guarantees with respect to mapping remote object invocations to threads. Since remote method invocation on the same remote object may execute concurrently, a remote object implementation needs to make sure its implementation is thread-safe.

Cheers,
Steve