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[protege-owl] protege owl api :outofmemory exception

Luigi Iannone iannone at
Wed Oct 1 03:47:39 PDT 2008

Hi Suja,

It may be the case that your ontology is really tough and challenges  
the reasoner.
Increasing the heap size beyond the physical limit of what you have  
available will only slow it down further. It is very likely that your OS
will resort to disk space in order to emulate the extra RAM, and disk  
access is much slower than RAM access.

You might want to check that everything is alright with the ontology  
itself. For that I suggest with  
the caveat that if it uses OWL2
the validator will not cope with its latest features

Hope this helps,

On 1 Oct 2008, at 11:30, sujaram at wrote:

> Hii,
> I am using protege owl api for developing an ontology application,  
> in eclipse.
> Problem is that while executing Pellet reasoner, i am getting an  
> "outOfMemory"
> exception. I tried increasing heap size using "-Xmx500M" flag. But  
> then system
> is getting hanged.
> Can anyone plzz help me to proceed? My RAM size is just 256 MB. Is  
> that the
> cause of problem? Should I upgrade?
> regards,
> suja.
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