Firefox install unsigned add-ons

Since Firefox 43, it won’t allow you to install unsigned extensions.

While it’s a good thing, you can revert it in case with the following steps:

To disable signature checks, you will need to set the xpinstall.signatures.required preference to “false”.

  • type about:config into the URL bar in Firefox
  • in the Search box type xpinstall.signatures.required
  • double-click the preference, or right-click and selected “Toggle”, to set it to false.

It will eventually show your unsigned extension with a warning but it should work out fine.


CQ5/OSGi reference a unique service implementation

You should never ever do it. If you find yourself in the need of this; there’s something extremely wrong in your code. Nevertheless I found myself in needing it for some old legacy code that was almost impossible to fix in a reasonable time.

The question is: how can I reference a specific implementation of a service/component in an OSGi (therefore CQ5 as well) environment?

In the component, where you need to reference the implementation you can specify something like the following

Bar bar;

In the component implementing the service you’ll have something like

@Component(immediate=true, metatype=false, name="")
class BarImpl implements Bar{

By default the framework will assign the fully qualified class name as component name. I prefer to specify it for making the code more readable and no one prohibit you to specify any arbitrary string like mickey mouse or goofy as component name.


Removing the design icon from SideKick in CQ5

When you set-up a proper website management in large organisations you’ll end up in having two main groups: designers and content editors.

Normally you want the designers to be a more powerful content editors; with added functionality like selecting which components you can use for contributing the pages.

In order to remove the “design icon” from the Sidekick for a specific group/user you simply have to act on ACL and remove everything but Read permissions on /etc/designs.

Having so

               Read Modify Create Delete R/ACL E/ACL Repl.
/etc/designs    V     x      x      x     x      x    x

Git push/pull only the current branch

It could happens that git will try to push/pull from all the branches in the “tree”. For example ifyou have master->b1->b2 and you’re working in b2 you see that master is pushed/pulled as well when executing the command.

All you need to do is to instruct git to not doing it.

$ git config --global push.default current
$ git config --global pull.default current


CQ & Sling servlets: resourceType

Last time we see how to use Sling servlets with old legacy URL. Today we’ll see how to create Sling Servlets in the Sling-way: using resourceType.


We want a component that can be dragged into a parsys. With a form that submit data to a sling servlet. Then the servlet will do the operations required.


Let’s create the component following the CQ guidelines for making it drag-droppable into a parsys (allowedParents): geometrixx/components/test003. The test003.jsp will look like the following:

<%@include file="/libs/foundation/global.jsp"%>
<form name="frm" method="post" action="<c:out value="${resource.path}" />.c">
    <input type="submit" />

This JSP will answer at a GET http call showing the form. In order to use, create a content page and drag the component into a parsys.

Now it’s time to create the servlet. As usual you’ll have to register it using some felix annotations. The following servlet will be used when posting (HTTP POST) to a resource of type geometrixx/components/test003 with an extension of “c”.


import javax.servlet.ServletException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

 * @scr.component immediate="true" metatype="false"
 * @scr.service interface="javax.servlet.Servlet"
 * name="sling.servlet.methods" values.0="POST"
 * name="sling.servlet.resourceTypes" values.0="geometrixx/components/test003"
 * name="sling.servlet.extensions" values.0="c"

public class ResourceTypePostServlet extends SlingAllMethodsServlet {
   private static final long serialVersionUID = 8795673847499208743L;
   private final static Logger logger = LoggerFactory.getLogger(ResourceTypePostServlet.class);

   protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
      response.getOutputStream().print("Hello ResourceTypePostServlet World!");

We used the sling.servlet.methods to specify which HTTP method the servlet listen to, the sling.servlet.resourceTypes to specify all the resource types is should listen to and the .extensions if you wish to specify an extension.

Remember that if you specify a sling.servlet.paths, resourceTypes, extensions and selectors will be ignored.

Now build the bundle and refresh the previously created content page (should not necessary actually). If you click on the “submit” button you’ll see the Hello World.


CQ & Sling servlets: old legacy URL

SlingIn this short article (first of a serie I hope) I’ll show you how to create a Sling Servlet in CQ.


You are migrating your existing application in CQ a piece at time and it’s time for the Servlets (controllers) part, so for the first stage you’d like to keep the old URLs. Maybe because some other external services are calling you at these coordinates or because you don’t want to enter each jsp and change the forms action.


  • CQ instance running in Author (localhost:4502)
  • CRXDE (let’s ease the game for starting)


Create a new OSGi bundle under geometrixx (or your app). In this create a new class that extends the SlingSafeMethodsServlet.
Then you have to register as a service in the OSGi container. This is done using the Felix annotations as following:

 * @scr.component immediate="true" metatype="false"
 * @scr.service interface="javax.servlet.Servlet"
 * name="sling.servlet.methods" values.0="GET"
 * name="sling.servlet.paths" values.0="/path/to/my/servlet"
 *                                          values.1="/apps/path/to/my/servlet"

I’ll leave you to the references section of this post for getting deeper into the meaning of each.

At the end your code will look something like the following:


import javax.servlet.ServletException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

 * @scr.component immediate="true" metatype="false"
 * @scr.service interface="javax.servlet.Servlet"
 * name="sling.servlet.methods" values.0="GET"
 * name="sling.servlet.paths" values.0="/path/to/my/servlet"
 *                values.1="/apps/path/to/my/servlet"
public class AbsoluteUrlServlet extends SlingSafeMethodsServlet {
   private static final long serialVersionUID = -1920460619265757059L;
   private static final Logger logger = LoggerFactory.getLogger(AbsoluteUrlServlet.class);

   protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
      response.getOutputStream().print("Hello AbsoluteUrlServlet World!");

Looking at the sling.servlet.paths annotation we se on which url we are actually mapping the servlet: /path/to/my/servlet and /apps/path/to/my/servlet.

Building the bundle and CRXDE+felix will do the magic of the deployment.

Now if you try to run localhost:4502/apps/path/to/my/servlet you’ll see our beautiful Helloworld, but if you’ll try to access localhost:4502/path/to/my/servlet you’ll get a 404 or a content listing.
This is due to a settings in felix+Sling. Open the felix console at the configuration tab (/system/console/configMgr) and search for Apache Sling Servlet/Script Resolver and Error Handler. Here you’ll have to add “/path/” to the Execution Paths section.

Done done!


Weekly link 2011-08

AeroVironment/DARPA Nano Hummingbird UAV flying

Hello JavaFX 2! – A TableView Component

London Stock Exchange in historic Linux go-live

Microsoft: Absolutely NO (GPLv3-or-compat-licensed) Free Software for Windows Phone and Xbox Apps.

BMW Wants to Be the Ultimate Green Machine

Intel’s Light Peak May See the Light This Week.

Intel details Thunderbolt, says Apple has full year head start

LaCie announce Intel Thunderbolt-equipped Little Big Disk

Weekly links 2011-07

Hello JavaFX 2! – Back To Java

Making of JBoss Enterprise Web Server

Applying agile practices in an environment of mistrust

ETL lessons learnt

Generate Test Data with DataFactory

The Roadmap for Day Software and LiveCycle ES – a Focus on UX

Springfuse generates Primefaces with Spring Web Flow front end

Spring MVC Development – Quick Tutorial

Open Letter from CEO Stephen Elop, Nokia and CEO Steve Ballmer, Microsoft

No more nokia phones for me.

OpenJDK Community Bylaws — DRAFT 7

weekly links 2011-06

Hackers penetrated Nasdaq’s network

Why go with RichFaces

Android Google Maps Tutorial

Using Java 6 processors in Eclipse

Next level of Don’t Repeat Yourself(DRY) principle

Java FX 2.0 – The Installation, Doc and Launch Experience – A Smoke Test

Linux vulnerable to Windows-style autorun exploits and fixed.

Dependency Injection Performance in Java EE 6: Dependent (easy) vs ApplicationScoped (“optimized”)