From 8c468636fb77ee273db0d2f80e7416ce119fdc5a Mon Sep 17 00:00:00 2001
From: Blaz Snuderl <snuderl@gmail.com>
Date: Thu, 23 Apr 2026 09:30:00 +0200
Subject: [PATCH] Fix cache key mismatch in RuleCache.compileRule

The descriptorMap lookup at the top of compileRule() used fieldDescriptor
(the user's field), but the corresponding store at the bottom uses
ruleFieldDesc (the rule field, e.g. StringRules.pattern). The read
therefore always missed, and cached CelRules were never reused across
different user fields that share the same predefined rule.

Use ruleFieldDesc for the lookup so it matches the store.
---
 src/main/java/build/buf/protovalidate/RuleCache.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/build/buf/protovalidate/RuleCache.java b/src/main/java/build/buf/protovalidate/RuleCache.java
index 44497dae..8cec0c0d 100644
--- a/src/main/java/build/buf/protovalidate/RuleCache.java
+++ b/src/main/java/build/buf/protovalidate/RuleCache.java
@@ -144,7 +144,7 @@ List<CompiledProgram> compile(
       FieldDescriptor ruleFieldDesc,
       Message message)
       throws CompilationException {
-    List<CelRule> celRules = descriptorMap.get(fieldDescriptor);
+    List<CelRule> celRules = descriptorMap.get(ruleFieldDesc);
     if (celRules != null) {
       return celRules;
     }