Concurrency Issues

Hi,

I am trying to use Jena Reasoner api with multiple threads in java. I use a Reasoner per thread instance. I am still getting exceptions like ‘ConcurrentModificationException’ at times. Some times I also get ‘predicate cannot be null’ when I actually try run a Sparql query against my RDF data store use Jena api.

Can you please let me know if there are any known issues with use the Jena api in a multithreaded environment?

Regards,
Pratik