[JENA-2019] Rule$ParserException in Jena rules when string literal equals to open parenthesis

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Jena 3.16.0, Jena 3.17.0
• Component/s: Jena

Environment

> java -version

openjdk version "1.8.0_232"
OpenJDK Runtime Environment (build 1.8.0_232-BellSoft-b10)
OpenJDK 64-Bit Server VM (build 25.232-b10, mixed mode)

Windows 8.1

• Assignee: Andy Seaborne
• Reporter: rdfman
• Created: 17/Dec/20 16:53
• Updated: 17/Apr/21 17:25
• Resolved: 16/Feb/21 17:50

Description

I have some Jena rules and I need to test a string literal in them:

@prefix my: <http://test/expressions#> .

# Rule including string "("
[(?a my:text "(") -> ]      # fails for '(' is single quotes too

And a call to 

List<Rule> rules = Rule.rulesFromURL(my_rules_path)

throws:

Exception in thread "main" org.apache.jena.reasoner.rulesys.Rule$ParserException: Expected ')' at end of clause, found ]
At '[ ( ?a my:text " ( " ) -> ] '
        at org.apache.jena.reasoner.rulesys.Rule$Parser.parseNodeList(Rule.java:987)
        at org.apache.jena.reasoner.rulesys.Rule$Parser.parseNode(Rule.java:906)
        at org.apache.jena.reasoner.rulesys.Rule$Parser.parseNodeList(Rule.java:983)
        at org.apache.jena.reasoner.rulesys.Rule$Parser.parseClause(Rule.java:998)
        at org.apache.jena.reasoner.rulesys.Rule$Parser.doParseRule(Rule.java:1057)
        at org.apache.jena.reasoner.rulesys.Rule$Parser.parseRule(Rule.java:1030)
        at org.apache.jena.reasoner.rulesys.Rule.parseRules(Rule.java:666)
        at org.apache.jena.reasoner.rulesys.Rule.rulesFromURL(Rule.java:515)
        at org.apache.jena.reasoner.rulesys.Rule.rulesFromURL(Rule.java:526)
        at ru.vstu.Main.runReasoning(Main.java:64)

This crash happens if the string is exactly equal to "(" (the use of double quotes or single quotes does not matter). Escaping also with backslash "\ (" does not help.
Changing the original string from "(" to "()" , "((" , "-(" or ")" eliminates the exception (but this is not what i want).