Next, the Client “locates” the rmiregistry on the server. This is a bit of a misnomer
because no communication is actually done here. The call merely sets up the necessary data
structures for later calls which do require communication, such as the lookup on the next line.
This Client wants to call a method on Server. To do this it needs the stub (which is on the
server). To get it, it asks the rmiregistry on the server to lookup the string name “Hello”
and send the stub over the internet/intranet. The stub is cast to a Hello type.
Next is the actual remove method invocation. The sayHello method on the stub is called,
the sub sends the request to the server, the server executes its sayHello method and
returns a String which is then sent across the inter/intranet to the client.
Finally, Client proudly prints the result from the remote method invocation. In this case, it
will be “Hello, world!”.
Compiling “Hello World”
The “Hello World” example involves a server and one or more clients. I am planning to continue using
this model – I intend to run my machine as the server and use other machines as clients. I will write all
code on my computer, then deploy code to the clients as necessary (i.e. only those classes necessary
to run the Client will ever make it to the client machine).
Given this setup, compiling is trivial. All of the “Hello World” code is in the subdirectory example/hello.
From a terminal window, I change directory (cd) to example/hello and type
javac Hello.java Client.java Server.java
This results in the creation of Hello.class, Client.class, and Server.class. Only
Client.class and Hello.class are needed on the client. To make it easy to deploy the compiled
code, I will package the two class files together using the Java archive tool jar. This will combine and
compress the files (using ZIP). At the command line, I type
cd ../../
jar cvf HelloClient.jar example/hello/Hello.class \
example/hello/Client.class
and the file HelloClient.jar is created with appropriate directory structure. See Figure 2 for the
Terminal output and Figure 3 for the directory structure.
Figure 2: Terminal with compilation commands and output.
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