tkobayas commented on code in PR #6708:
URL: 
https://github.com/apache/incubator-kie-drools/pull/6708#discussion_r3264903936


##########
drools-model/drools-model-codegen/src/main/java/org/drools/model/codegen/execmodel/PackageModel.java:
##########
@@ -154,7 +155,7 @@ public class PackageModel {
 
     private final List<MethodDeclaration> functions = new ArrayList<>();
 
-    private final List<TypeDeclaration> generatedPOJOs = new ArrayList<>();
+    private final List<TypeDeclaration> generatedPOJOs = new 
CopyOnWriteArrayList<>();

Review Comment:
   During build, helper classes like `accumulate5Accumulate68` are added to 
this list. With a plain `ArrayList`, the added class may lost under concurrency 
and resulted in a build erorr.



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