quarkus-micrometer-bug Project

Issue

Disabling micrometer metrics causes NullPointerException when RestClient is created (either via @RestClient or RestClientBuilder)

Generated with

Simple Quarkus project generated with Quarkus 2.8.1.Final and extensions:

• quarkus-resteasy (classic)
• quarkus-resteasy-jsonb
• quarkus-rest-client-jsonb
• quarkus-micrometer-registry-prometheus

Changes made to sample code

1. application.properties - disabled micrometer
2. Added Rest client interface with empty get method
3. In Server rest resource, inject rest client

Observed behaviour

Caused by: java.lang.NullPointerException
    at io.quarkus.micrometer.runtime.binder.RestClientMetricsListener.prepClientMetrics(RestClientMetricsListener.java:50)
    at io.quarkus.micrometer.runtime.binder.RestClientMetricsListener.onNewClient(RestClientMetricsListener.java:38)
    at io.quarkus.restclient.runtime.QuarkusRestClientBuilder.lambda$build$0(QuarkusRestClientBuilder.java:236)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
    at io.quarkus.restclient.runtime.QuarkusRestClientBuilder.build(QuarkusRestClientBuilder.java:236)
    at io.quarkus.restclient.runtime.RestClientBase.create(RestClientBase.java:72)