yeroc commented on code in PR #493:
URL: 
https://github.com/apache/maven-build-cache-extension/pull/493#discussion_r4462881028


##########
src/main/java/org/apache/maven/buildcache/CacheControllerImpl.java:
##########
@@ -1475,8 +1476,15 @@ private Set<Path> 
collectCachedArtifactPaths(MavenProject project) {
             paths.add(projectArtifact.getFile().toPath());
         }
 
-        // 2. Attached outputs from configuration (if cacheCompile enabled)
+        // 2. Compile output directory and attached outputs from configuration 
(if cacheCompile enabled)
         if (cacheConfig.isCacheCompile()) {
+            // The project artifact file is not set yet at the start of a 
session, so step 1 misses
+            // target/classes. Stage it explicitly so the compiler cannot keep 
classes compiled against
+            // a different version of an upstream module.
+            Path classesDir = 
Paths.get(project.getBuild().getOutputDirectory());
+            if (Files.exists(classesDir)) {
+                paths.add(classesDir);

Review Comment:
   Removed in 9514713.



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