If your myOntology object is an OntModel and has reasoning enabled then
writeAll will ask it to create the entire closure of the model before
(well as part of) writing it out. The closure of the model can be a
*lot* bigger than the model.
Technically the closure can be infinite but part of the reason the rule
sets offer only incomplete OWL and RDFS reasoning fragments is to avoid
the infinite cases as best they can.
That said, there's no evidence of a reasoner in your example stack trace.
WriteAll will also include the imported ontologies. If you have very
large imports then that would both blow up the reasoning and increase
the output size.
Apart from just turning off reasoning then one way to investigate this
is to separate the steps.
First create a new in-memory model add add your OntModel to it
(model#add). That will materialize all the closure. If that completes
successfully then you both have a simple model you can write out but you
also know the size of the closure.
If that does complete successfully but write as RDF/XML still fails then
try with RDF/XML-ABBREV.
Dave
On 06/10/17 02:40, Steve Vestal wrote:
64m, enough to hold the entire model several times over.
On 10/5/2017 8:32 PM, David Jordan wrote:
Recursion.
Try increasing the stack size of your JVM when you run it.
On Thu, Oct 5, 2017 at 9:18 PM, Steve Vestal <[email protected]
wrote:
What might cause
myOntology.writeAll(outStream, "RDF/XML");
(where myOntology is an OntModel) to get a stack overflow
java.lang.StackOverflowError
at java.util.regex.Pattern$GroupHead.match(Unknown Source)
at java.util.regex.Pattern$BmpCharProperty.match(Unknown Source)
.......
at org.apache.jena.iri.impl.Parser.<init>(Parser.java:90)
at org.apache.jena.iri.impl.IRIImpl.<init>(IRIImpl.java:65)
at
org.apache.jena.iri.impl.AbsIRIFactoryImpl.create(
AbsIRIFactoryImpl.java:40)
at
org.apache.jena.iri.impl.IRIFactoryImpl.create(IRIFactoryImpl.java:264)
at org.apache.jena.riot.system.PrefixMapStd.add(PrefixMapStd.java:69)
at java.util.HashMap.forEach(Unknown Source)
at
org.apache.jena.riot.system.PrefixMapBase.putAll(PrefixMapBase.java:76)
Changing "writeAll" to "write" works fine.
