may be you are using some other jar files in your custom code which are used by cmis jar and due to unavailability of those jars, you are getting that error. I tried to install cmis client jar directly that u mentined above in both 5.4 n 5.6.1 and it was fine. 

As per my knowledge, CRX does not support CMIS although it mentioned here  which creates confusion. Not sure why this link is still active. 

If it helps then mark it as resolved. 

Have you performed the below steps correctly?1. Start Eclipse (Indigo). The steps below have been tested on Eclipse Java EE IDE for Web Developers version Indigo Service Release 1.2. Select File, New, Other.3. Under the Plug-in Development folder, choose Plug-in from Existing JAR Archives. Name your...

I think the screenshot that you mentioned is for creation of archetype project. You need to perform those steps.

Please checkhttp://jackrabbit.510166.n4.nabble.com/get-child-nodes-sorted-by-jcr-name-td3520099.htmlhttp://blog.jeroenreijn.com/2009/06/jcr-sorting-on-child-node-properties.html

Geoffroy Schneck wrote...Your can add the cq:Console mixin to your widget or Resource to have it in the list, define vanity path, an icon..Hope this helps.Geoffroy Thanks Geoffory for your help!I was able to add custom item under /apps/wcm/core/content but I couldn't add icon for item. I tried to ad...

I want to add a custom item as described in the attached screenshot. I looked into /libs/cq/core/components/welcome/welcome.jsp but could not understand where I need to add. I Appreciate your help.Thank you! 

can you post what are the parameter you mentioned in the command prompt? 

Thanks but it didn't fit into my requirement. I had to make an entry into css file. Now its working.Appreciate your help!