On 01/06/15 10:42, Diana Magdi wrote:
Hi,
I have an large OWL ontology file as RDF which includes swrl rules and i'm
trying to reason in java with jena TDB using Pellet but when i run the
following code on eclipse.
[snip]
i get this exception:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
[snip]
What am I doing incorrect ? Thanks
Pellet is not part of Apache Jena so you will need to ask the Pellet
folks for support.
However, as far as I know, Pellet will build all its inference
structures in-memory so running over TDB will just result in slower
performance it won't give you increased scalability of reasoning.
The basic problem is that you don't have enough memory for inference
over the scale/complexity of your ontology. If you have already
allocated Java all the memory you reasonably can [*] then you may not be
able to use Pellet in this application without some change to your
ontology/rules.
Dave
[*] There is a trade-off here. For TDB you want to leave a decent amount
of memory to the system so that it can use it for disk buffers. For
large in-memory inference structures you need to allocate memory to the
java process.
