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Type:
Bug
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Status: Resolved
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: 1.6.0
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Component/s: Core Framework
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Labels:None
As reported on the dev@n.a.o
mailing list:
Hi,
It looks like I have stumbled upon a bug in substitution of evaluated expressions.
A test case:
String result = org.apache.nifi.attribute.expression.language.Query.prepare("${foo}$${foo}").evaluateExpressions(Collections.singletonMap("foo", "bar"), null);
Expected result:
bar${foo}
Observed result:
barbar
The issue exists in 1.5.0 and, as far as I can tell, in the master branch.The cause is quite simple: Query.prepare(...) splits the input string into pieces to be evaluated and substituted or to be copied literally, but it doesn't keep track of which is which.That couldn't possibly work. If a piece to be copied literally happens to be equal to one of the pieces to be substituted, the things go wrong, as the test case demonstrates.
Regards,Sergei.
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