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https://issues.apache.org/jira/browse/NIFI-5077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16435866#comment-16435866
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Otto Fowler commented on NIFI-5077:
-----------------------------------
{code:java}
@Test
public void testNifi() throws Throwable {
g.addPatternFromFile(ResourceManager.PATTERNS);
g.compile("%{POSINT:pos}|%{INT:int}");
Match gm = g.match("-42");
gm.captures();
assertEquals("{int=-42}",gm.toMap().toString());
}
Results :
Failed tests:
GrokTest.testNifi:215 expected:<{int=-42[]}> but was:<{int=-42[, pos=null]}>
{code}
This better illustrates what is going on
> Grok pattern match presenting null values
> -----------------------------------------
>
> Key: NIFI-5077
> URL: https://issues.apache.org/jira/browse/NIFI-5077
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.6.0
> Environment: CentOS 7
> Reporter: Ramon de Graaff
> Assignee: Otto Fowler
> Priority: Major
> Attachments: grok.xml
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Pattern matches but also attaches null values.
> grok-pattern:
> {{TEST %\{A}|%\{B}}}
> {{A %\{INT:test}}}
> {{B %\{INT:test}}}
> {{INT (?:[+-]?(?:[0-9]+))}}
> flowfile-content:
> {{1}}
> Flow file attributes after match:
> {{grok.A}}
> {{1}}
> {{grok.TEST}}
> {{1}}
> {{grok.test}}
> {{[1, null]}}
>
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