Tips: How to Pass the AEM 6.0 Developer Exam

Posted on January 6, 2015 by Kristian

Since my last post about passing the Adobe AEM 6.0 Developer exam, I’ve had a few people contact me to ask for advice on the best way to pass this exam.

The first tip I have is to use the product. Seems simple, but the more you use AEM the more you’ll learn. Experiment and try things out. One the things I like about AEM is its ease to create back up packages. Package up your code, experiment, and if it doesn’t work, re-install your package. But keep on using it, and you’ll become more and more proficient, which will help you in the exam.

The next tip is make sure you are familiar with the topics outlined in the AEM 6.0 Developer Exam Guide. These topics are listed in the exam guide for a reason – they form the questions for the exam! So use them as the basis for some self study with the official .

The final piece of advice I have is to sit some AEM training if possible. In particular I’d suggest the AEM Sites: Developer (AEM 6.0), AEM Sites: Advanced Developer (AEM 6.0), and AEM Sites: System Administration (AEM 6.0) courses.

There’s nothing mind shattering in this post, but hopefully it will help people on the right track towards passing the exam. If it’s not possible to sit the courses, I suggest studying the exam guide and the docs, and trying out what you’ve learned on a running AEM instance at the very least – that should be enough to get you through.

Good luck!

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Adobe Certified Expert, AEM 6.0 Developer

Posted on November 22, 2014 by Kristian

With the update from CQ 5.5 to AEM 6 earlier this year, Adobe has also updated their Adobe Certified Expert exams for the new version.  I thought I should ensure I keep my certification current, so I sat the exam.

Adobe Certified Expert, Adobe Experience Manager: Developer

I’m now an Adobe Certified Expert, AEM 6.0 Developer.  And according to Adobe, I’m the first person to get this credential in Australia.  :-)

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Day CQ WCM Debug Filter Configuration Missing

Posted on June 27, 2014 by Kristian

As part of general security hardening of an AEM instance, Adobe recommends turning off the debug filter in Production Publish instances as part of the OSGi configurations (http://dev.day.com/docs/en/cq/current/deploying/security_checklist.html#OSGI Settings).

However, it seems that this configuration is no longer found in the OSGi configurations in AEM 5.6.1. It’s back in AEM 6.0 and from what I’ve heard this may be addressed in a future release of AEM 5.6.x.

But for those currently on 5.6.1, how can you change a configuration that does not exist and prevent debug output being enabled? By either stopping the com.day.cq.wcm.core.impl.WCMDebugFilter component under http://localhost:4502/system/console/components, or by curl:

curl -u admin:admin -d "action=disable" http://localhost:4503/system/console/components/com.day.cq.wcm.core.impl.WCMDebugFilter
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AEM Gotchya: No packages in Package Manager

Posted on June 27, 2014 by Kristian

I was working with a client who had a problem with no packages showing in the CRX package manager. I checked the usual suspects of not being logged in etc, but everything looked fine. When checking the error.log, I saw this line:

log:  27.06.2014 13:16:53.845 *ERROR* [127.0.0.1 [1402543013788] GET /crx/packmgr/list.jsp?_dc=1402543013769&_charset_=utf-8&includeVersions=true HTTP/1.1] com.day.crx.packmgr.impl.servlets.ListServlet Error while retrieving infos: javax.jcr.RepositoryException: Invalid path:/etc/packages/my_packages/.snapshot/My Packagename

CRXDE Lite showed that the path /etc/packages/my_packages/.snapshot/My Packagename was indeed valid. Checking the packages installed via curl gave me the the clue to the problem:

curl -u admin:admin http://localhost:4502/crx/packmgr/service.jsp?cmd=ls

<crx version="2.4.42" user="admin" workspace="crx.default">
  <request>
    <param name="cmd" value="ls"/>
  </request>
  <response>
    <data>
      <packages>
        . . . 
        . . .
        <package>
          <group>my_packages</group>
          <name>My Packagename </name>
          <version>1.0</version>
          <downloadName>My Packagename-1.0.zip</downloadName>
          <size>8770</size>
          <created>Thu, 12 Jun 2014 15:25:33 +1000</created>
          <createdBy>admin</createdBy>
          <lastModified>Thu, 12 Jun 2014 15:25:33 +1000</lastModified>
          <lastModifiedBy>admin</lastModifiedBy>
          <lastUnpacked></lastUnpacked>
          <lastUnpackedBy>null</lastUnpackedBy>
        </package>
        . . . 
        . . . 
      </packages>
    </data>
    <status code="200">ok</status>
  </response>
</crx>

What I couldn’t see in the error log you can clearly see in the package listing – a trailing space at the end of the package name.

After ducking back into CRXDE Lite, it was easy to rename the package by editing the ‘name’ property of the vault definition located at /etc/packages/my_packages/My Packagename-1.0.zip/jcr:content/vlt:definition. Then after refreshing the packages in Package Manager, packages were displayed and all was working as expected again.

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AEM 6.0: Admin sessions

Posted on June 27, 2014 by Kristian

Things on a content management system

With AEM6.0 comes a small feature, which you should use to reconsider your usage of sessions, especially the use of admin sessions in your OSGI services.

The feature is: “ResourceResolverFactory.getAdministrativeResourceResolver” is going to be deprecated!

Oh wait, that should be a feature, you might ask. Yes, it is. Because it is being replaced by a feature, which allows you to easily replace the sessions, previously owned by the admin (for the sake of laziness of the developer …) by sessions owned by regular users. Users which don’t have the super-power of admin, but regular users, which have to follow the ACLs as any other regular user.

A nice description how it works can be found on the Apache Sling website.

But how do you use it?

First, define what user should be used by your service. Specify this in the form “symbolic-bundle-name:sub service-name=user” in the config of the…

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