On 29/03/2023 14:24, Mikael Pesonen wrote:
Here the next line was REPLACE that's why regex
VALUES ?class_label { " \\(häiriö\\)" " \\(löydös\\)" " \\(toimenpide\\)" }
?concept rdfs:label ?fsnl FILTER (REGEX(?fsnl, $class_label)) .
BIND (REPLACE(?fsnl, ?class_label, "") AS ?newl) .
But indeed, I didn't mean to use $ in $class_label, no idea what that
syntax means. But it was not the cause here?
No.
>> org.apache.jena.sparql.expr.ExprException: REGEX: Pattern is not a
string: " \\(häiriö\\)"@fi
It says " \\(häiriö\\)"@fi
It has a language tag.
The query you show does not seem to be the query being run.
Regexs are xsd:strings, not language tag strings.
So to use constants, write above like this?
?concept rdfs:label ?fsnl
FILTER (REGEX(?fsnl, " \\(häiriö\\)") | REGEX(?fsnl, " \\(löydös\\)") |
REGEX(?fsnl, " \\(toimenpide\\)") ) .
BIND (REPLACE(?fsnl, " \\(häiriö\\)", "") AS ?newl1) .
BIND (REPLACE(?newl1, " \\(löydös\\)", "") AS ?newl2) .
BIND (REPLACE(?newl2, " \\(toimenpide\\)", "") AS ?newl) .
Try it on a small amount of data.
Andy
On 29/03/2023 15.20, Andy Seaborne wrote:
On 29/03/2023 12:56, Rob @ DNR wrote:
Yes, you can filter these out, the logger in question is the class
name shown, the log4j configuration will need to reference that via
its fully qualified name i.e.
org.apache.jena.sparql.engine.iterator.QueryIterFilterExpr and set it
to ERROR/OFF to suppress these warnings
Issuing millions of instances of the same identical warning certainly
seems like a bug to me, especially since this is elicited by query
input it could potentially be abused as a DoS attack vector.
Rob
From: Mikael Pesonen <[email protected]>
Date: Wednesday, 29 March 2023 at 10:22
To: [email protected] <[email protected]>
Subject: Re: Strategies to avoid log flooding
Below is the log, so is it possible to filter just these out?
Unfortunately I don't recall the exact regex but it was related to
escaping parentheses, so maybe this or with one back slash:
...
VALUES ?class_label { " \\(häiriö\\)" " \\(löydös\\)" "
\\(toimenpide\\)" }
?concept rdfs:label ?fsnl FILTER (REGEX(?fsnl, $class_label)) .
That does not align with the log message which says the pattern is "
\\(häiriö\\)"@fi
meaning $class_label is @fi.
Use str() to get the lexical part.
The regex is potentially different every call. So the regex is
compiled every call. (If it's the same, a constant, it is compiled once.)
Here, write as three calls, one per constant.
Or use CONTAINS, because a regex is unnecessary in this case.
Andy
...
So this is a bug not a feature and can be corrected?
Mar 27 13:13:33 insight-terms java[2512289]: [2023-03-27 13:13:33]
QueryIterFilterExpr WARN Expression Exception in (regex ?fsnl
?class_label)
Mar 27 13:13:33 insight-terms java[2512289]:
org.apache.jena.sparql.expr.ExprException: REGEX: Pattern is not a
string: " \\(häiriö\\)"@fi
Mar 27 13:13:33 insight-terms java[2512289]: #011at
org.apache.jena.sparql.expr.E_Regex.makeRegexEngine(E_Regex.java:120)
~[fuseki-server.jar:4.6.1]
