In one of my projects I am using a content repository to store the data. The platform for the application is the Spring framework and so I decided to use the JCR part of Spring Modules to access the content repository. This solution worked out great so far – I ran only into one problem so far: Every time I start up my application it tries to register the namespace of the CND file again, which fails on the second run with the Exception:

Invalid node type
definition: {http://www.troii.com/troii}Folder already exists:
{http://www.troii.com/troii}Folder already exists

I googled a bit and found other people having that problem too. I fixed that problem as suggested in the thread by surrounding the method call registerNodeTypes inside JackrabbitSessionFactory.registerNodetypes() with a try-catch statement.

What bothers me a bit is that the Spring Modules project was deprecated and stopped development somewhen in the mid of 2008. The successor of Spring Moduls should be Spring Extensions but their page does not mention anything about JCR. So what is up with JCR in the Spring environment?