Probably related to this JIRA: https://issues.apache.org/jira/browse/NIFI-4407
2018-03-28 18:42 GMT+02:00 Mark Payne <marka...@hotmail.com>: > Sergei, > > Thanks for reporting this! I have created a JIRA [1] to track this. > > -Mark > > [1] https://issues.apache.org/jira/browse/NIFI-5026 > > > On Mar 28, 2018, at 7:36 AM, Sergei Zhirikov <sf...@yahoo.com.INVALID< > mailto:sf...@yahoo.com.INVALID>> wrote: > > 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. > > >
