Failing tests:
org.optaplanner.examples.examination.app.ExaminationPerformanceTest.solveComp_set5FastAssert
org.optaplanner.examples.examination.app.ExaminationPerformanceTest.solveComp_set5
org.optaplanner.examples.taskassigning.app.TaskAssigningPerformanceTest.solveModel_50tasks_5employees

Caused by:
java.util.ConcurrentModificationException: null
at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134)
at org.drools.core.impl.KnowledgeBaseImpl.getOrCreateExactTypeDeclaration(KnowledgeBaseImpl.java:1458)
at org.drools.core.common.NamedEntryPoint.update(NamedEntryPoint.java:324)
at org.drools.core.impl.StatefulKnowledgeSessionImpl.update(StatefulKnowledgeSessionImpl.java:1570)
at org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.update(DroolsScoreDirector.java:254)