drools-eclipse/org.jbpm.eclipse/src/main/java/org/jbpm/eclipse/JBPMEclipsePlugin.java
public static ImageDescriptor getImageDescriptor(String path) {
        JBPMEclipsePlugin plugin = getDefault();
        ImageRegistry reg = plugin.getImageRegistry();
        ImageDescriptor des = reg.getDescriptor(path);
        if (des == null) {
            des = AbstractUIPlugin.imageDescriptorFromPlugin("org.jbpm.eclipse", path);
            reg.put(path, des);
        }
        return des;
    }
public static ImageDescriptor getImageDescriptor(String path) {
        JBPMEclipsePlugin plugin = getDefault();
        ImageRegistry reg = plugin.getImageRegistry();
        ImageDescriptor des = reg.getDescriptor(path);
        if (des == null) {
            des = AbstractUIPlugin.imageDescriptorFromPlugin("org.jbpm.eclipse", path);
            reg.put(path, des);
        }
        return des;
    }
Returns an image descriptor for the image file at the given
plug-in relative path.
Uses the plug ins image registry to "cache" it.

@param path the path
@return the image descriptor