Bug 21183 Class javadoc created during "New Class" operation doesn't fill in variables properly [javadoc] [code manipulation]
If you use the enclosing_type variable in your javadoc comment template, it is not properly filled in when you make a new class (using the New Class dialog). Probably the class should be created, then after creating and saving, javadoc should be added. I suspect the variables don't have valid values yet at the time the javadoc is prepended to the class.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/wizards/NewTypeWizardPage.java
/**
	 * Sets the super class name.
	 * 
	 * @param name the new superclass name
	 * @param canBeModified  if <code>true</code> the superclass name field is
	 * editable; otherwise it is read-only.
	 */		
	public void setSuperClass(String name, boolean canBeModified) {
		fSuperClassDialogField.setText(name);
		fSuperClassDialogField.setEnabled(canBeModified);
	}	
	
	/**
	 * Returns the chosen super interfaces.
	 * 
	 * @return a list of chosen super interfaces. The list's elements
	 * are of type <code>String</code>
	 */
	public List getSuperInterfaces() {
		return fSuperInterfacesDialogField.getElements();
	}
	/**
	 * Sets the super interfaces.
	 * 
	 * @param interfacesNames a list of super interface. The method requires that
	 * the list's elements are of type <code>String</code>
	 * @param canBeModified if <code>true</code> the super interface field is
	 * editable; otherwise it is read-only.
	 */	
	public void setSuperInterfaces(List interfacesNames, boolean canBeModified) {