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  1. OptaPlanner
  2. PLANNER-2308

VariableListeners are not being picked up by the optaplanner-quarkus extension

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Details

    • Bug
    • Status: Resolved (View Workflow)
    • Major
    • Resolution: Done
    • None
    • None
    • optaplanner-quarkus
    • None
    • 2021 Week 04-06 (from Jan 25), 2021 Week 07-09 (from Feb 15)
    • 1
    • NEW
    • NEW

    Description

      In the task-assigning model we have the following variable listener:

      public class StartAndEndTimeUpdatingVariableListener implements VariableListener<TaskAssigningSolution, TaskAssignment> {
      
          public StartAndEndTimeUpdatingVariableListener() {
      
          }
      
         //bla bla bla
      }
      

      The listener above works well in a quarkus service implemented by using the optaplanner-quarkus extension and the task-assigning model.

      For example, it's possible to inject the SolverFactory<TaskAssigningSolution> in a service class, create solver instances etc.

      However, when we build the native image for the same service and execute it, at runtime we get the following error:

      2021-01-20 18:15:12,054 ERROR [io.qua.ver.htt.run.QuarkusErrorHandler] (executor-thread-1) HTTP Request to /task-assigning/executeSolver failed, error id: 1b4402be-f6fa-48af-997e-b4c05de64a2e-1: org.jboss.resteasy.spi.UnhandledException: java.lang.IllegalArgumentException: The CustomShadowVariableDescriptor's variableListenerClass (org.kie.kogito.taskassigning.core.model.solver.StartAndEndTimeUpdatingVariableListener) does not have a public no-arg constructor.
              at org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:106)
              at org.jboss.resteasy.core.ExceptionHandler.handleException(ExceptionHandler.java:372)
      

      Which basically complains about a "missing no-arg constructor", however the constructor exists.

      NOW, if we decorate the listener above with the @RegisterForRelection annotation and repeat the build procedure, etc, the native image will work.

      @RegisterForReflection
      public class StartAndEndTimeUpdatingVariableListener implements VariableListener<TaskAssigningSolution, TaskAssignment> {
      
          public StartAndEndTimeUpdatingVariableListener() {
              // required for native execution.
          }
          bla bla bla 
      }
      
      

      The conclusion is that the VariableListener are not being picked up and properly processed by the optaplanner-quarkus extension.

      The workaround is to decorate the variable listener with the @RegisterForReflection annotation.

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              cchianel Christopher Chianelli
              wmedvede@redhat.com Walter Medvedeo
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                Created:
                Updated:
                Resolved: