From fb755f557ad7f444d151a34d08606a6790427232 Mon Sep 17 00:00:00 2001
From: Marcin Grzejszczak <marcin@grzejszczak.pl>
Date: Thu, 28 Dec 2023 15:30:22 +0100
Subject: [PATCH] Improved nullability annotations on ValueExpressionResolver;
 fixes gh-4094

---
 .../micrometer/common/annotation/ValueExpressionResolver.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/micrometer-commons/src/main/java/io/micrometer/common/annotation/ValueExpressionResolver.java b/micrometer-commons/src/main/java/io/micrometer/common/annotation/ValueExpressionResolver.java
index 6bb642bc8e..bf7bf850c8 100644
--- a/micrometer-commons/src/main/java/io/micrometer/common/annotation/ValueExpressionResolver.java
+++ b/micrometer-commons/src/main/java/io/micrometer/common/annotation/ValueExpressionResolver.java
@@ -16,6 +16,7 @@
 package io.micrometer.common.annotation;
 
 import io.micrometer.common.KeyValue;
+import io.micrometer.common.lang.Nullable;
 
 /**
  * Resolves the {@link KeyValue} value for the given parameter and the provided
@@ -33,6 +34,7 @@ public interface ValueExpressionResolver {
      * @param parameter parameter annotated with a {@link KeyValue} related annotation
      * @return the value of the {@link KeyValue}
      */
-    String resolve(String expression, Object parameter);
+    @Nullable
+    String resolve(String expression, @Nullable Object parameter);
 
 }