AEM UUID

[#1]

Hi,

I would like know the case-sensitivity of the UUID generated in AEM.

Currently I see the UUID is generated,

• UUID represented as 32 hexadecimal digits and displayed in five groups separated by hyphens in the form 8-4-4-4-12 for a total of 36 characters
• Technically in Hex decimal system there is no uppercase or lowercase difference.  
• UUID generation guidelines suggest the systems to use lowercase ( RFC4122).

If above conditions are true then UUID generated in aem will always be in lowercase?Can anyone confirm on this.

Regards,

Hari

[#2]

What UUIDs are you talking about? And why is it important to know the details of the creation algorithm? Do you want to create UUIDS on your own?

regards,

Jörg

[#3]

Hi,

i am am taking about “jcr:uuid”....I am going to send the “jcr:uuid” created in aem to my downstream systems for storing in their databas...

[#4]

I do not think Adobe will reveal details of their algorithms like this. Its not pubic information.

[#5]

A few thoughts to your approach:

1. UUIDs are implementation details of the repository, and I would never reference them from an external system. I would always use paths instead.
2. Remember David's Model, rule 7 [2].

To answer your question: A lot of Oak classes use an import of "java.util.UUID", and I've seen several times it being used. That means, I would assume that this class is used to generate UUIDs. But as long as it is not part of the official API of either JCR, Oak or AEM, I would always consider this as an implementation detail. It might work, but it also might break without further notice. In any case I would not depend on it. As said, rather use the path.

Jörg

[1] DavidsModel - Jackrabbit Wiki

[#6]

Thanks for your thoughts @Jörg Hoh and smacdonald2008