thomasmueller commented on code in PR #2573:
URL: https://github.com/apache/jackrabbit-oak/pull/2573#discussion_r2426152172


##########
oak-jcr/src/test/java/org/apache/jackrabbit/oak/jcr/binary/fixtures/nodestore/DocumentMemoryNodeStoreFixture.java:
##########
@@ -87,11 +86,11 @@ public NodeStore createNodeStore() {
 
             // track all main components
             if (dataStore != null) {
-                components.put(nodeStore, DataStore.class.getName(), 
dataStore);
-                components.put(nodeStore, DataStore.class.getName() + 
":folder", dataStoreFolder);
+                components.computeIfAbsent(nodeStore, k -> new 
LinkedHashMap<>()).put(DataStore.class.getName(), dataStore);
+                components.computeIfAbsent(nodeStore, k -> new 
LinkedHashMap<>()).put(DataStore.class.getName() + ":folder", dataStoreFolder);
             }

Review Comment:
   I think it does work: the first call
   `components.computeIfAbsent(nodeStore, k -> new LinkedHashMap<>())` 
   will add a LinkedHashMap (because it is absent) and the second call will 
re-use it...



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