From 70e9d512c114d0f90057464a20b192e527182dfc Mon Sep 17 00:00:00 2001
From: wangzhancheng <704450642@qq.com>
Date: Thu, 13 Oct 2022 21:40:05 +0800
Subject: [PATCH] fix spring-webflux cast to PathPattern throws
 ClassCastException

Signed-off-by: wangzhancheng <704450642@qq.com>
---
 .../spring/webflux/server/WebfluxSingletons.java       | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/instrumentation/spring/spring-webflux-5.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spring/webflux/server/WebfluxSingletons.java b/instrumentation/spring/spring-webflux-5.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spring/webflux/server/WebfluxSingletons.java
index 56b325050997..17e3c6152660 100644
--- a/instrumentation/spring/spring-webflux-5.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spring/webflux/server/WebfluxSingletons.java
+++ b/instrumentation/spring/spring-webflux-5.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spring/webflux/server/WebfluxSingletons.java
@@ -41,9 +41,15 @@ public static Instrumenter<Object, Void> instrumenter() {
 
   public static HttpRouteGetter<ServerWebExchange> httpRouteGetter() {
     return (context, exchange) -> {
-      PathPattern bestPattern =
+      Object bestPatternObj =
           exchange.getAttribute(HandlerMapping.BEST_MATCHING_PATTERN_ATTRIBUTE);
-      return bestPattern == null ? null : bestPattern.getPatternString();
+      if (bestPatternObj == null) {
+        return null;
+      }
+      if (bestPatternObj instanceof PathPattern) {
+        return ((PathPattern) bestPatternObj).getPatternString();
+      }
+      return bestPatternObj.toString();
     };
   }