From 07c58b12db8461dfe2b34dd3351b6fb427d640d9 Mon Sep 17 00:00:00 2001
From: Georgios Andrianakis <geoand@gmail.com>
Date: Mon, 19 Apr 2021 16:56:27 +0300
Subject: [PATCH] Avoid potential NPE in Metrics filter

The NPE could happen if an exception was thrown
in a ContainerRequestFilter

Fixes: #16620
---
 .../smallrye/metrics/runtime/QuarkusRestMetricsFilter.java     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/extensions/smallrye-metrics/runtime/src/main/java/io/quarkus/smallrye/metrics/runtime/QuarkusRestMetricsFilter.java b/extensions/smallrye-metrics/runtime/src/main/java/io/quarkus/smallrye/metrics/runtime/QuarkusRestMetricsFilter.java
index e34d8ffbba5da..5b90e7a40fb6d 100644
--- a/extensions/smallrye-metrics/runtime/src/main/java/io/quarkus/smallrye/metrics/runtime/QuarkusRestMetricsFilter.java
+++ b/extensions/smallrye-metrics/runtime/src/main/java/io/quarkus/smallrye/metrics/runtime/QuarkusRestMetricsFilter.java
@@ -17,6 +17,9 @@ public class QuarkusRestMetricsFilter {
 
     @ServerResponseFilter
     public void filter(ResourceInfo resourceInfo, Throwable throwable) {
+        if (resourceInfo == null) { // can happen if an exception was thrown before a target method has been identified
+            return;
+        }
         final Class<?> resourceClass = resourceInfo.getResourceClass();
         final Method resourceMethod = resourceInfo.getResourceMethod();
         maybeCreateMetrics(resourceClass, resourceMethod);