[DIRSERVER-1853] NPE in getChildCount() when reverting in an AVL partition

• Type: Bug
• Status: Reopened
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.0.0-M12
• Component/s: avl
• Assignee: Unassigned
• Reporter: Piotr Kubowicz
• Created: 11/Jun/13 09:05
• Updated: 26/Jun/19 06:14

Description

Stacktrace:

org.apache.directory.api.ldap.model.exception.LdapOperationException
at org.apache.directory.server.core.DefaultDirectoryService.revert(DefaultDirectoryService.java:1177)
Caused by: org.apache.directory.api.ldap.model.exception.LdapOperationErrorException
at org.apache.directory.server.core.partition.impl.btree.AbstractBTreePartition.getChildCount(AbstractBTreePartition.java:2156)
at org.apache.directory.server.core.partition.impl.btree.AbstractBTreePartition.delete(AbstractBTreePartition.java:825)
at org.apache.directory.server.core.shared.partition.DefaultPartitionNexus.delete(DefaultPartitionNexus.java:441)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor$1.delete(BaseInterceptor.java:185)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.journal.JournalInterceptor.delete(JournalInterceptor.java:181)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.changelog.ChangeLogInterceptor.delete(ChangeLogInterceptor.java:161)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.trigger.TriggerInterceptor.delete(TriggerInterceptor.java:336)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.event.EventInterceptor.delete(EventInterceptor.java:244)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.subtree.SubentryInterceptor.delete(SubentryInterceptor.java:1055)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.operational.OperationalAttributeInterceptor.delete(OperationalAttributeInterceptor.java:482)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.exception.ExceptionInterceptor.delete(ExceptionInterceptor.java:206)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.admin.AdministrativePointInterceptor.delete(AdministrativePointInterceptor.java:1261)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.authz.DefaultAuthorizationInterceptor.delete(DefaultAuthorizationInterceptor.java:225)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.authz.AciAuthorizationInterceptor.delete(AciAuthorizationInterceptor.java:664)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.referral.ReferralInterceptor.delete(ReferralInterceptor.java:288)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.authn.AuthenticationInterceptor.delete(AuthenticationInterceptor.java:737)
at org.apache.directory.server.core.api.interceptor.BaseInterceptor.next(BaseInterceptor.java:480)
at org.apache.directory.server.core.normalization.NormalizationInterceptor.delete(NormalizationInterceptor.java:170)
at org.apache.directory.server.core.DefaultOperationManager.delete(DefaultOperationManager.java:586)
at org.apache.directory.server.core.shared.DefaultCoreSession.delete(DefaultCoreSession.java:340)
at org.apache.directory.server.core.shared.DefaultCoreSession.delete(DefaultCoreSession.java:325)
at org.apache.directory.server.core.DefaultDirectoryService.revert(DefaultDirectoryService.java:1142)
Caused by: java.lang.NullPointerException
at org.apache.directory.server.core.partition.impl.btree.AbstractBTreePartition.getChildCount(AbstractBTreePartition.java:2152)

Unfortunately, this happens randomly and I don't have clear reproduction steps. I run some unit test on AVL partitions on 2.0.0-M12. The test is like:

// test setup

service = new DirectoryServiceBuilder(...).buildService();
changeLog = new DefaultChangeLog();
changeLog.setExposed(true);
changeLog.setEnabled(true);
changeLog.init(service);
service.setChangeLog(changeLog);
service.setShutdownHookEnabled(true);

builder.buildPartition(...);
changeLog.tag();

// test case

changeLog.tag();

// some testing

service.sync();
service.revert(taggedRevision); // NPE here