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java rmi (remote method invocation) tutorial

java rmi is a mechanism that allows a java object running in one java virtual machine (jvm) to invoke methods on an object running in another jvm. this feature is useful for building distributed applications.

#### key concepts

1. **remote interface**: this defines the methods that can be called remotely. the interface must extend `java.rmi.remote` and each method must throw `remoteexception`.

2. **remote object**: this is the implementation of the remote interface. it must extend `java.rmi.server.unicastremoteobject` to allow it to be exported to the rmi runtime.

3. **rmi registry**: a simple server-side naming service that enables clients to look up remote objects. it runs on a specific port (default is 1099).

4. **rmi client**: this is the application that invokes methods on remote objects.

#### steps to create a java rmi application

1. **define the remote interface**.
2. **implement the remote interface**.
3. **create the rmi registry**.
4. **create the rmi client**.
5. **compile and run the application**.

example code

#### step 1: define the remote interface



#### step 2: implement the remote interface



#### step 3: create the rmi registry and bind the remote object



#### step 4: create the rmi client



#### step 5: compile and run the application

1. **compile the code**:



2. *run the rmi registry* (in a separate terminal):



3. **run the server**:



4. *run the client* (in another terminal):



additional considerations

**security**: rmi has security features, such as the use of a security manager to control access to resources.
**stub generation**: in older versions of rmi, you would need to generate stubs using `rmic`, but with java 5 and above, dynamic proxy classes are used, so this step is not necessary.
**error handling**: always implement error handling to manage `remoteexception` and other potential issues with network communication.

conclusion

java rmi provi ...

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