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https://issues.apache.org/jira/browse/OAK-1173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13821024#comment-13821024
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Tobias Bocanegra commented on OAK-1173:
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also see OAK-1172 which shows that getChildNodeCount() does extra checks for
hidden child nodes
> NPE if TreePermissionImpl if tree does not have a primary type
> --------------------------------------------------------------
>
> Key: OAK-1173
> URL: https://issues.apache.org/jira/browse/OAK-1173
> Project: Jackrabbit Oak
> Issue Type: Bug
> Reporter: Tobias Bocanegra
> Priority: Blocker
>
> NPE If a tree given to CompiledPermissionImpl.getTreePermission() does not
> have a primary type, e.g. for a "hidden" oak node:
> {noformat}
> at
> com.google.common.base.Preconditions.checkNotNull(Preconditions.java:191)
> at
> org.apache.jackrabbit.oak.security.authorization.permission.CompiledPermissionImpl.getTreePermission(CompiledPermissionImpl.java:160)
> at
> org.apache.jackrabbit.oak.security.authorization.permission.CompiledPermissionImpl$TreePermissionImpl.getChildPermission(CompiledPermissionImpl.java:443)
> at
> org.apache.jackrabbit.oak.core.SecureNodeBuilder.getTreePermission(SecureNodeBuilder.java:352)
> at
> org.apache.jackrabbit.oak.core.SecureNodeBuilder.exists(SecureNodeBuilder.java:129)
> at
> org.apache.jackrabbit.oak.core.SecureNodeBuilder.hasChildNode(SecureNodeBuilder.java:271)
> at
> org.apache.jackrabbit.oak.core.AbstractTree.getChildrenCount(AbstractTree.java:248)
> {noformat}
> The tree passed here to get the children count is:
> {{/jcr:system/jcr:versionStorage}} and the child node not having a primary
> type is {{:index}}
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