Github user stain commented on the issue:
https://github.com/apache/jena/pull/47
OK, I've rebased for 3.1.1-SNAPSHOT, updated for Java 8 and fixed the
System properties.
As for the `FIXME` comment let's just leave it here, unless someone
understands or would be willing to investigate what is the semantic difference
between the `LPInterpreter` constructor [without
clauses](https://github.com/apache/jena/blob/master/jena-core/src/main/java/org/apache/jena/reasoner/rulesys/impl/LPInterpreter.java#L99)
and [with
clauses](https://github.com/apache/jena/blob/master/jena-core/src/main/java/org/apache/jena/reasoner/rulesys/impl/LPInterpreter.java#L111)
(which could be
[empty](https://github.com/apache/jena/blob/master/jena-core/src/main/java/org/apache/jena/reasoner/rulesys/impl/LPInterpreter.java#L130))
but then would not use `engine.getRuleStore().codeFor(goal)`.
(Perhaps raise that as a new Jira issue?)
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