Major Description
The following is the stack trace seen when Ranger policy engine searches Trie object with SELF_OR_CHILD scope.
java.lang.NullPointerException at java.util.AbstractCollection.addAll(AbstractCollection.java:343) at org.apache.ranger.plugin.policyengine.RangerResourceTrie$TrieNode.collectChildEvaluators(RangerResourceTrie.java:1161) at org.apache.ranger.plugin.policyengine.RangerResourceTrie.lambda$getEvaluatorsForResource$0(RangerResourceTrie.java:604) at java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1628) at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:647) at org.apache.ranger.plugin.policyengine.RangerResourceTrie.getEvaluatorsForResource(RangerResourceTrie.java:604) at org.apache.ranger.plugin.policyengine.RangerResourceTrie.getEvaluatorsForResource(RangerResourceTrie.java:180) at org.apache.ranger.plugin.policyengine.RangerPolicyRepository.getLikelyMatchPolicyEvaluators(RangerPolicyRepository.java:811) at org.apache.ranger.plugin.policyengine.RangerPolicyRepository.getLikelyMatchAccessPolicyEvaluators(RangerPolicyRepository.java:764) at org.apache.ranger.plugin.policyengine.RangerPolicyRepository.getLikelyMatchPolicyEvaluators(RangerPolicyRepository.java:741) at org.apache.ranger.plugin.policyengine.RangerPolicyEngineImpl.evaluatePoliciesNoAudit(RangerPolicyEngineImpl.java:585) at org.apache.ranger.plugin.policyengine.RangerPolicyEngineImpl.zoneAwareAccessEvaluationWithNoAudit(RangerPolicyEngineImpl.java:486) at org.apache.ranger.plugin.policyengine.RangerPolicyEngineImpl.evaluatePolicies(RangerPolicyEngineImpl.java:110) at org.apache.ranger.plugin.service.RangerBasePlugin.isAccessAllowed(RangerBasePlugin.java:356)