Holger Knublauch created JENA-2151:
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Summary: Iter.filter does not close nested iterator
Key: JENA-2151
URL: https://issues.apache.org/jira/browse/JENA-2151
Project: Apache Jena
Issue Type: Bug
Affects Versions: Jena 4.1.0
Reporter: Holger Knublauch
Attachments: IteratorFilter.java
We recently attempted to upgrade our product to Jena 4.1.0 but noticed unclosed
iterator warnings. I believe I have tracked it down to the fact that
Iter.filter does not return a Closeable iterator and therefore does not close
its nested (stream) iterator. I am attaching an implementation class that seems
to fix it. With this, org.apache.jena.atlas.iterator.Iter.filter simply need to
become
{code:java}
public static <T> Iterator<T> filter(final Iterator<? extends T> stream,
final Predicate<T> filter) {
return new IteratorFilter<T>(stream, filter);
}
{code}
(Although Iter.filter hasn't changed for a while, I suspect some other changes
to Jena caused the SPARQL engine to use it, and this has broken some scenarios
for us - in particular calling SPIN/SHACL-SPARQL functions with BGPs in the
WHERE clause).
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