[Oracle] Crashes during shutdown with NullPointerException in RuleEvaluationServiceComponent

[NilukaSripalim]

Description

Configured with an Oracle database, encounters a crash during the shutdown process. The error log shows a NullPointerException in the org.wso2.carbon.identity.rule.evaluation component, specifically related to the unbinding of the "RuleMetadataService" reference. Below are the details of the error.

ERROR {org.wso2.carbon.identity.rule.evaluation} - [SCR] Exception occurred while unbinding reference Reference[name = rule.metadata.service.component, interface = org.wso2.carbon.identity.rule.metadata.service.RuleMetadataService, policy = dynamic, cardinality = 1..1, target = null, bind = setRuleMetadataService, unbind = unsetRuleMetadataService]
	Details:
	Problematic reference = Reference[name = rule.metadata.service.component, interface = org.wso2.carbon.identity.rule.metadata.service.RuleMetadataService, policy = dynamic, cardinality = 1..1, target = null, bind = setRuleMetadataService, unbind = unsetRuleMetadataService]
	of service component = rule.evaluation.service.component
	component implementation class = org.wso2.carbon.identity.rule.evaluation.internal.RuleEvaluationServiceComponent
	located in bundle with symbolic name = org.wso2.carbon.identity.rule.evaluation
	bundle location = reference:file:../plugins/org.wso2.carbon.identity.rule.evaluation_7.7.124.jar java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:115)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.eclipse.equinox.internal.ds.model.ComponentReference.unbind(ComponentReference.java:476)
	at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.unbindReference(ServiceComponentProp.java:617)
	at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.unbind(ServiceComponentProp.java:262)
	at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.dispose(ServiceComponentProp.java:388)
	at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.dispose(ServiceComponentProp.java:102)
	at org.eclipse.equinox.internal.ds.InstanceProcess.disposeInstances(InstanceProcess.java:344)
	at org.eclipse.equinox.internal.ds.InstanceProcess.disposeInstances(InstanceProcess.java:306)
	at org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:368)
	at org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:222)
	at org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:113)
	at org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:985)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:234)
	at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:151)
	at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:866)
	at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:804)
	at org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java:227)
	at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.unregisterServices(ServiceRegistry.java:668)
	at org.eclipse.osgi.internal.framework.BundleContextImpl.close(BundleContextImpl.java:133)
	at org.eclipse.osgi.internal.framework.EquinoxBundle.stopWorker0(EquinoxBundle.java:1029)
	at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.stopWorker(EquinoxBundle.java:370)
	at org.eclipse.osgi.container.Module.doStop(Module.java:653)
	at org.eclipse.osgi.container.Module.stop(Module.java:515)
	at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.decStartLevel(ModuleContainer.java:1861)
	at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1753)
	at org.eclipse.osgi.container.SystemModule.stopWorker(SystemModule.java:275)
	at org.eclipse.osgi.internal.framework.EquinoxBundle$SystemBundle$EquinoxSystemModule.stopWorker(EquinoxBundle.java:202)
	at org.eclipse.osgi.container.Module.doStop(Module.java:653)
	at org.eclipse.osgi.container.Module.stop(Module.java:515)
	at org.eclipse.osgi.container.SystemModule.stop(SystemModule.java:207)
	at org.eclipse.osgi.internal.framework.EquinoxBundle$SystemBundle$EquinoxSystemModule$1.run(EquinoxBundle.java:220)
	at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: java.lang.NullPointerException: Cannot invoke "org.wso2.carbon.identity.rule.metadata.service.RuleMetadataService.getApplicableOperatorsInExpressions()" because "ruleMetadataService" is null
	at org.wso2.carbon.identity.rule.evaluation.core.OperatorRegistry.loadOperators(OperatorRegistry.java:67)
	at org.wso2.carbon.identity.rule.evaluation.internal.RuleEvaluationComponentServiceHolder.setRuleMetadataService(RuleEvaluationComponentServiceHolder.java:66)
	at org.wso2.carbon.identity.rule.evaluation.internal.RuleEvaluationServiceComponent.unsetRuleMetadataService(RuleEvaluationServiceComponent.java:89)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	... 32 more

Steps to Reproduce

Start the WSO2 Identity Server, configured against an Oracle database.
Attempt to shut down the server gracefully. ( contol + C)
Observe the logs during the shutdown process.

Version

wso2is-7.1.0-m8

Environment Details (with versions)

DB : Oracle 23ai
Java version: temurin-21
OS: MacOS