Listando todos os projetos do workspace

SampleHandler.java

package com.jdt.info.handlers;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;

/**
 * Our sample handler extends AbstractHandler, 
 * an IHandler base class.
 * 
 * @author xpto Samuel T. C. Santos
 * 
 * @see org.eclipse.core.commands.IHandler
 * @see org.eclipse.core.commands.AbstractHandler
 */
public class SampleHandler extends AbstractHandler {
	/**
	 * The constructor.
	 */
	public SampleHandler() {
	}

	/**
	 * the command has been executed, so extract extract
	 * the needed information from the application context.
	 */
	public Object execute(ExecutionEvent event) throws ExecutionException {

		IWorkspace workspace = ResourcesPlugin.getWorkspace();
		IWorkspaceRoot root = workspace.getRoot();
		
		IProject[] projects = root.getProjects();
		
		for (IProject project : projects){
			System.out.println(project.getName());
		}
		
		return null;
	}
}