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Posted to issues@hbase.apache.org by "lujie (JIRA)" <ji...@apache.org> on 2018/04/15 12:24:00 UTC

[jira] [Created] (HBASE-20419) Two Potential NPE

lujie created HBASE-20419:
-----------------------------

             Summary: Two Potential NPE 
                 Key: HBASE-20419
                 URL: https://issues.apache.org/jira/browse/HBASE-20419
             Project: HBase
          Issue Type: Bug
    Affects Versions: 2.0.0-beta-2
            Reporter: lujie
         Attachments: HBASE-20419_1.patch

Callee ZKUtil#listChildrenAndWatchForNewChildren may return null, it has 8 callers, 6 of the caller have null checker like:
{code:java}
List<String> children = ZKUtil.listChildrenAndWatchForNewChildren(zkw, zkw.znodePaths.rsZNode);
if (children == null) {
    return Collections.emptyList();
}
{code}
but another two callers do not have null checker:RSGroupInfoManagerImpl#retrieveGroupListFromZookeeper,ZKProcedureMemberRpcs#watchForAbortedProcedures. 

We attach the patch to fix this probelm.(We found this bug by  tool [NPEDetector|https://github.com/lujiefsi/NPEDetector])



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