Bug 78867 Using new registry API
Following some rework of the registry, please apply this patch to make use of the new method called getNamespace() on IConfigurationElement. This patch will convert most occurrences of: configurationElement.getDeclaringExtension().getNamespace() into configurationElement.getNamespace()
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/java/hover/JavaEditorTextHoverDescriptor.java
public String getId() {
			return fElement.getAttribute(ID_ATTRIBUTE);
	}
	/**
	 * Returns the hover's class name.
	 */
	public String getHoverClassName() {
		return fElement.getAttribute(CLASS_ATTRIBUTE);
	}
	 
	/**
	 * Returns the hover's label.
	 */
	public String getLabel() {
		String label= fElement.getAttribute(LABEL_ATTRIBUTE);
		if (label != null)
			return label;
			
		
		label= getHoverClassName();
		int lastDot= label.lastIndexOf('.');
		if (lastDot >= 0 && lastDot < label.length() - 1)
			return label.substring(lastDot + 1);
		else
			return label;
	}
	/**
	 * Returns the hover's description.
	 * 
	 * @return the hover's description or <code>null</code> if not provided