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Tip of the Day
Language: Java
Expertise: Intermediate
Apr 30, 1999



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Listing Remote Objects in Registry

When creating programs that use Remote Method Invocation (RMI), you'll need to obtain a reference to a remote object. Although the name of the specific object will usually be pre-defined in your code, it can be helpful to select the name at run time. To do this, you need to be able to find out what objects are currently in the registry, and the static list() method in the java.rmi.Naming class allows you to do just that. It takes a single String parameter, which identifies the host on which the registry is running.
import java.rmi.*;

public class RegList {
	public static void main(String[] args) throws Exception {
		String host;
		if (args.length == 0) host = "localhost:1099";
		else host = args[0];
		String[] names = Naming.list("//" + host + "/");
		for (int i = 0; i < names.length; i++)
	}  //  public static void main()
}  //  public class RegList()
This code will obtain the list of registered remote objects by calling the list() method, and displays the list, with output similar to:
Brett Spell
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