Abhitocode opened a new issue, #7194:
URL: https://github.com/apache/incubator-kie/issues/7194

   A BPMN process variable declared with a raw collection type 
(`structureRef="java.util.List"`,` java.util.ArrayList`) makes the Quarkus 
build fail as soon as persistence / data-index proto generation runs:
   ```
   Build step 
org.kie.kogito.quarkus.processes.deployment.ProcessesAssetsProcessor#postGenerationProcessing
 threw an exception:
   java.lang.RuntimeException: Error while generating proto for model class 
com.example.ListtestModel
   Field myList of class com.example.ListtestModel uses collection without type 
information
       at 
org.kie.kogito.quarkus.workflow.deployment.JandexProtoGenerator.messageFromClass(JandexProtoGenerator.java:150)
   ```
   The same restriction exists in `ReflectionProtoGenerator`. Such processes 
are valid in jBPM 7 and are common in migrated projects, where scripts populate 
the list with `kcontext.setVariable("myList", new java.util.ArrayList())`.


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