java.lang.IllegalStateException: The matchWeigher of UniConstraintStream.penalize(matchWeigher) of the constraint (org.acme.vaccinationscheduler.domain/Second dose must be assigned) must return a long.

	at org.optaplanner.core.impl.score.stream.bavet.uni.BavetScoringUniConstraintStream.createNode(BavetScoringUniConstraintStream.java:139)
	at org.optaplanner.core.impl.score.stream.bavet.uni.BavetScoringUniConstraintStream.createNode(BavetScoringUniConstraintStream.java:39)
	at org.optaplanner.core.impl.score.stream.bavet.uni.BavetAbstractUniConstraintStream.createNodeChain(BavetAbstractUniConstraintStream.java:297)
	at org.optaplanner.core.impl.score.stream.bavet.uni.BavetAbstractUniConstraintStream.createChildNodeChains(BavetAbstractUniConstraintStream.java:322)
	at org.optaplanner.core.impl.score.stream.bavet.uni.BavetAbstractUniConstraintStream.createNodeChain(BavetAbstractUniConstraintStream.java:299)
	at org.optaplanner.core.impl.score.stream.bavet.uni.BavetAbstractUniConstraintStream.createChildNodeChains(BavetAbstractUniConstraintStream.java:322)
	at org.optaplanner.core.impl.score.stream.bavet.uni.BavetAbstractUniConstraintStream.createNodeChain(BavetAbstractUniConstraintStream.java:299)
	at org.optaplanner.core.impl.score.stream.bavet.uni.BavetAbstractUniConstraintStream.createChildNodeChains(BavetAbstractUniConstraintStream.java:322)
	at org.optaplanner.core.impl.score.stream.bavet.uni.BavetAbstractUniConstraintStream.createNodeChain(BavetAbstractUniConstraintStream.java:299)
	at org.optaplanner.core.impl.score.stream.bavet.uni.BavetFromUniConstraintStream.createNodeChain(BavetFromUniConstraintStream.java:50)
	at org.optaplanner.core.impl.score.stream.bavet.BavetConstraint.createNodes(BavetConstraint.java:51)
	at org.optaplanner.core.impl.score.stream.bavet.BavetConstraintSession.lambda$new$0(BavetConstraintSession.java:70)
	at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:684)
	at org.optaplanner.core.impl.score.stream.bavet.BavetConstraintSession.<init>(BavetConstraintSession.java:69)
	at org.optaplanner.core.impl.score.stream.bavet.BavetConstraintSessionFactory.buildSession(BavetConstraintSessionFactory.java:57)
	at org.optaplanner.core.impl.score.director.stream.ConstraintStreamScoreDirectorFactory.newConstraintStreamingSession(ConstraintStreamScoreDirectorFactory.java:92)
	at org.optaplanner.test.impl.score.stream.DefaultSingleConstraintVerification.given(DefaultSingleConstraintVerification.java:41)
	at org.optaplanner.test.impl.score.stream.DefaultSingleConstraintVerification.given(DefaultSingleConstraintVerification.java:28)
	at org.acme.vaccinationscheduler.solver.VaccinationScheduleConstraintProviderTest.secondDoseMustBeAssigned(VaccinationScheduleConstraintProviderTest.java:213)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
	at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
	at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
	at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
	at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
	at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:210)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)
	at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
	at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
	at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:128)

    Constraint secondDoseMustBeAssigned(ConstraintFactory constraintFactory) {
        // If a person is coming for their 2nd dose, assign them to a dose, regardless of their age.
        return constraintFactory
                .from(Person.class)
                .filter(person -> person.getDoseNumber() > 1 && person.getVaccinationSlot() == null)
                .penalize("Second dose must be assigned", HardMediumSoftLongScore.ONE_HARD,
                        person -> person.getDoseNumber() - 1);
    }

    @Test
    void secondDoseMustBeAssigned() {
        constraintVerifier.verifyThat(VaccinationScheduleConstraintProvider::secondDoseMustBeAssigned)
                .given(
                        new Person(null, "Ann", null, null, 0, null),
                        new Person(null, "Carl", null, null, 0, 2, PFIZER, null, null, null, PFIZER_MONDAY_SLOT))
                .penalizesBy(0);
        constraintVerifier.verifyThat(VaccinationScheduleConstraintProvider::secondDoseMustBeAssigned)
                .given(
                        new Person(null, "Ann", null, null, 0, PFIZER_MONDAY_SLOT),
                        new Person(null, "Carl", null, null, 0, 2, PFIZER, null, null, null, null))
                .penalizesBy(1);
    }