Time for action – wiring a menu to a command with a handler

As with Eclipse 3.x, a command has an identifier and an associated handler class, which can be bound to menus. Unlike Eclipse 3.x, it is not specified in the plugin.xml file; instead, it is specified in the Application.e4xmi file.

1. Open the Application.e4xmi file in the com.packtpub.e4.application project.

2. Navigate to the Application | Commands node in the tree, and click on Add child to add a new Command:

   1. ID: com.packtpub.e4.application.command.hello

   2. Name: helloCommand

   3. Description: Says Hello

   

3. Create a class HelloHandler in the com.packtpub.e4.application.handlers package. It doesn't need to have any specific superclass or method implementation. Instead, create a method called hello which takes no arguments, and prints a message to System.out. The method needs the @Execute annotation:

   package com.packtpub.e4.application.handlers;
   import org.eclipse.e4.core.di.annotations.Execute;
   public class HelloHandler {
     @Execute
     public void...