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https://issues.apache.org/jira/browse/CAMEL-15457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17183119#comment-17183119
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Claus Ibsen commented on CAMEL-15457:
-------------------------------------
What version of Camel do you use?
> camel-micrometer: NullPointer exception triggered by
> MicrometerExchangeEventNotifier
> ------------------------------------------------------------------------------------
>
> Key: CAMEL-15457
> URL: https://issues.apache.org/jira/browse/CAMEL-15457
> Project: Camel
> Issue Type: Bug
> Components: camel-micrometer
> Reporter: Espen Andreassen
> Priority: Major
>
> A recent [comit|[https://github.com/apache/camel/pull/3976]] causes
> NullPointer exceptions in some circumstances, though they are caught and
> logged as "WARN".
> Output from the test testCamelRouteEvents() in
> MicrometerExchangeEventNotifierTest in master branch:
> {code:java}
> 11:44:32.741 [main] WARN org.apache.camel.support.EventHelper - Error
> notifying event ID-devbox-1598261669122-0-1 exchange
> Exchange[ID-devbox-1598261669122-0-1] sending to: direct://in. This exception
> will be ignored.11:44:32.741 [main] WARN org.apache.camel.support.EventHelper
> - Error notifying event ID-devbox-1598261669122-0-1 exchange
> Exchange[ID-devbox-1598261669122-0-1] sending to: direct://in. This exception
> will be ignored.java.lang.NullPointerException: null at
> java.util.Objects.requireNonNull(Objects.java:221) ~[?:?] at
> io.micrometer.core.instrument.ImmutableTag.<init>(ImmutableTag.java:35)
> ~[micrometer-core-1.5.4.jar:1.5.4] at
> io.micrometer.core.instrument.Tag.of(Tag.java:29)
> ~[micrometer-core-1.5.4.jar:1.5.4] at
> io.micrometer.core.instrument.Tags.of(Tags.java:254)
> ~[micrometer-core-1.5.4.jar:1.5.4] at
> org.apache.camel.component.micrometer.eventnotifier.MicrometerExchangeEventNotifierNamingStrategy.getInflightExchangesTags(MicrometerExchangeEventNotifierNamingStrategy.java:58)
> ~[classes/:?] at
> org.apache.camel.component.micrometer.eventnotifier.MicrometerExchangeEventNotifier.handleExchangeEvent(MicrometerExchangeEventNotifier.java:80)
> ~[classes/:?] at
> org.apache.camel.component.micrometer.eventnotifier.MicrometerExchangeEventNotifier.notify(MicrometerExchangeEventNotifier.java:65)
> ~[classes/:?] at
> org.apache.camel.support.EventHelper.doNotifyEvent(EventHelper.java:1236)
> ~[classes/:?] at
> org.apache.camel.support.EventHelper.notifyExchangeSending(EventHelper.java:700)
> ~[classes/:?]
> {code}
> The problem is that the MicrometerExchangeEventNotifier tries to build/update
> a metric on inflight exchanges in a route based on an ExchangeEvent with no
> associated fromRoute/fromRouteId. Events such as "ExchangeSendingEvent", as
> is created in the test, is an example of such an ExchangeEvent.
>
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