org.apache.sling.api.resource.PersistenceException: Unable to commit changes to session.

[unai_sarasola]

I'm having the following exception: org.apache.sling.api.resource.PersistenceException: Unable to commit changes to session.

when I try to make commit to a ResourceResolver. 

It's only happening to me in a new machine where I'm migrating my tools, in the older It works fine with the same packages. Do you know what can be happening?

Thank you

[smacdonald2008]

If a save is working on machine A and not on Machine B - there is an environment setting that is different that accounts for this difference (this setting is making the resource read-only - no modifications). It can be a few things: 

1 - does the user have permission to save node? 

2 - is the node in the JCR at the same location? 

Can you try and save as admin and see if that works? i suspect it may be a permission issue. 

[unai_sarasola]

Hi,

Yes, I'm logged as admin and I can create sites, etc, with my current permissions.

The JCR is at the same location,

I think is something related with the environment, looking into the stack trace I found this:

Caused by: javax.jcr.nodetype.ConstraintViolationException: OakConstraint0030: Uniqueness constraint violated at path [/] for one of the property in [jcr:uuid] having value e3e76b1d-0ada-42a7-b51c-2130e5b4c0ae 

Caused by: javax.jcr.nodetype.ConstraintViolationException: OakConstraint0030: Uniqueness constraint violated at path [/] for one of the property in [jcr:uuid] having value e3e76b1d-0ada-42a7-b51c-2130e5b4c0ae

                at org.apache.jackrabbit.oak.api.CommitFailedException.asRepositoryException(CommitFailedException.java:225)

                at org.apache.jackrabbit.oak.api.CommitFailedException.asRepositoryException(CommitFailedException.java:212)

                at 

Thank you

[unai_sarasola · Accepted solution]

Finally I found the solution.

The problem was that the blueprint contain in some of the elements the jcr:uuid created. As this have to be unique, when the code replicate the page It also copy the uuid and that broke the constraint of Oak that having unique uuids