Trying to call WS services (with JSON format) from the front controllers is transparent.

<pre>
    public static void index() {
         HttpResponse response = WS.url("http://localhost:9011/api/accounts").get();
         JsonElement json = response.getJson();

        render(json);
    }
</pre>

But trying to make dynamic pages with JQuery querying from the front page the the back controller, the results were blocked due tothe Same Origin Policy. So I had to specify the Cross-Origin Resource Sharing on the back controller.

Here is the code to add on the controller of the backapplication : this will add the header to allow the caller to access the service :

    public static void listAccounts() {
        List<Account> accounts = Account.findAll();
        Http.Header hd = new Http.Header();
        hd.name = "Access-Control-Allow-Origin";
        hd.values = new ArrayList&lt;String&gt;();
            hd.values.add("http://localhost:9010");
        Http.Response.current().headers.put("Access-Control-Allow-Origin",hd);
        renderJSON(accounts);

    }

You can sepecify a list of domains to accept as origin, or set it to * to allow all domains to call your service.

And the JQuery call :

$("#accounts").click(function(){

        $.getJSON('http://localhost:9011/api/accounts', function(accounts) {
            var items = [];

            $.each(accounts, function(title, acc) {
            console.log(acc);
                $("#results").append('<p>'+acc.number+'</p>');
            });
        });

});

You can generalize the CORS setting with the @Before annotation, so all your services in a class will be accessible :

@Before public static void setCORS() { Http.Header hd = new Http.Header(); hd.name = "Access-Control-Allow-Origin"; hd.values = new ArrayList<String>(); hd.values.add("http://localhost:9010"); Http.Response.current().headers.put("Access-Control-Allow-Origin",hd); }

Then your services coding in the controller is wery simple :

    public static void listAccounts() {
        List<Account> accounts = Account.findAll();
        renderJSON(accounts);

    }

There’s now a ant task to use sonar on your project build by ant. You’ll have the same results, except that by default, you will not have the results of your tests (passed/failed) and the coverage of your tests. To add them in your sonar pass, you have to :

• add a cobertura task in your ant task (just follow cobertura how to, installation and adding the task). With maven, the coverage is automatically calculated when sonar is launched (mvn sonar:sonar).
• add 2 properties (<code>sonar.cobertura.reportPath</code> and <code>sonar.surefire.reportsPath</code>) in the sonar task to include reports (test and coverage) generated by junit and cobertura tasks. They must point to the reports generated.

Here’s the sonar task that will include the two reports generated by junit and cobertura  tasks :

<taskdef uri="antlib:org.sonar.ant" resource="org/sonar/ant/antlib.xml">
    <!-- classpath path="path/to/sonar/ant/task/lib" / -->
    <!-- This sonar Ant task library can also be put in the ${ANT_HOME\}/lib directory-->
    <!-- In such case this classpath node is no more mandatory -->
</taskdef>

<!-- Out-of-the-box those parameters are optional -->
<!-- EXAMPLE FOR MYSQL -->
<property name="sonar.jdbc.url" value="jdbc:mysql://192.168.1.3:3306/sonar?useUnicode=true&amp;characterEncoding=utf8" />
<property name="sonar.jdbc.driverClassName" value="com.mysql.jdbc.Driver" />
<property name="sonar.jdbc.username" value="sonar" />
<property name="sonar.jdbc.password" value="sonar" />

<target name="sonar">
    <!-- list of mandatories Sonar properties -->
    <property name="sonar.sources" value="src" />

    <!-- list of optional Sonar properties -->
    <!-- property name="sonar.projectName" value="this value overrides the name defined in Ant root node" / -->
    <!-- property name="sonar.binaries" value="list of directories which contain for example the Java bytecode" / -->
    <!-- property name="sonar.tests" value="unittest" / -->
    <!-- property name="sonar.libraries" value="list of paths to libraries separated by a comma (These libraries are for example used by the Sonar Findbugs plugin)" / -->
    <property name="sonar.cobertura.reportPath" value="${cobertura.report.dir}/coverage.xml"/>
    <property name="sonar.surefire.reportsPath" value="${build.test.dir}" />

    <sonar:sonar key="groupId:aretefactId version="0.1-SNAPSHOT" xmlns:sonar="antlib:org.sonar.ant">
        <tests>
            <path location="test" />
        </tests>
    </sonar:sonar>
</target>

I’ve put the jar of the sonar plugin in ant library directory, so the classpath to sonar is left blank. And if you’ve install the sonar plugin in eclipse, you’ll have to remember the groupId and artefactId to link the project with the sonar results. And the advantage is that you’ll have the link betwwen the violations and the source line directly in eclipse.

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If you encountered an error  in this chapter, calling the managedQuery function, the easy to find correction is mentioned here on editor “p2p” (programmer to programmer) site.

More interesting info is the replacement of the use of the deprecated class People.

But this don’t mention the correction for the “Force close” when launching the app on Android 2.3.3.

<exec dir="${basedir}" executable="hostname" outputproperty="host.name">

The trick is the attribute outputpropety of the exec task. You can then use ${host.name} variable to use the hostname in your ant scripts.

So a better option is to use the UUID of the drive and set the auto mount option. To gert the UUID, launch gparted again and right click on the partition. In the dialog box you’ll have a item will the UUID of the partition. Just copy the value. Edit again /etc/fstab and set the line of mount point the the code below this time :

UUID=<value copied>       /media/MyXFSDrive xfs user,auto 0 0

Related articles

• UUIDs in Ubuntu | Unix Tutorial (sandeepbhalla.wordpress.com)
• How to mount a windows partition on Linux automatically on each start up (computerandu.wordpress.com)

In fact, it’s a bit hidden. You have to go to Menu -> Download, and you’ll see previous installed apps, included Aspahalt 5.

Edit : by the way, I found it now on the market and there’s a free version !

So, if as me your favorite clock is TypoClock, here it is (as a reminder for me) : the thread on xda

Related articles

• Review: Typo Clock (Widget) (androidguys.com)

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I use a NAS as my main drive to maintain my datas shared against my computers (and to not have to make copies when changing it). But my Buffallo crashed a disk for the second time (the same one,  I think it’s corrupted and I’ll try to have it replaced by the support).

But before sending it back to consumer’s service, I want to have my datas back on a rescue disk. So I wanted to use the safe disk to copy files on a third drive. The problem is that the disks use XFS filesystem. No way to copy files from Winows. Fortunately, I have a dual boot with Ubuntu, that natively can read XFS . so below are the steps to achieve the copy process :

Get the packages to support XFS :

# sudo apt-get install xfsprogs
# sudo apt-get install xfsdump
# sudo apt-get install gparted

Now you have to identify the partition to mount : use gparted

Gparted utility

You can use the drop down list on the top right to select your hard drive, then you’ll see the list of partition; just identify your partition with XFS filesystem (/dev/sdd6 in my case).

So next step is  to edit /etc/fstab to specify the mount characteristic (filesystem type : xfs and associated mount point : /media/whatYouWant ) ; just add the line above

/dev/sdd6    /media/MyXFSDrive xfs defaults 0 0

No create the mount point for your drive and mount it :

 # sudo mkdir/media/MyXFSDrive
# sudo mount /dev/sdd6

It’s finished, you can access your drive and make your backups.

On these virtual installations of Ubuntu I couldn’t have the Unity interface : the reason is simple, Unity need graphic acceleration, so do not forget to check the graphic acceleration in the configuration of your virtual machine.