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https://issues.apache.org/jira/browse/ZOOKEEPER-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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lujie updated ZOOKEEPER-3010:
-----------------------------
Environment:
was:
{code:java}
static code analysis{code}
> Potential NPE in Observer#observeLeader and Follower#followLeader
> -----------------------------------------------------------------
>
> Key: ZOOKEEPER-3010
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3010
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.6.0
> Environment:
>
> Reporter: lujie
> Priority: Major
>
> After ZK-3006 , I develop a very simple static analysis tool to find other
> Potential NPE like ZK-3006, this bug is found by this tool and carefully
> studied by myself, hopefully someone can confirm it.
> h2. Bug description:
> callee Learner#findLeader will return null and callee developer check it but
> just log:
> {code:java}
> // code placeholder
> if (leaderServer == null) {
> LOG.warn("Couldn't find the leader with id = " + current.getId());
> }
> return leaderServer;
> {code}
> caller Observer#observeLeader and Follower#followLeader will directly use
> return value w/o null check:
> {code:java}
> //Follower#followLeader
> QuorumServer leaderServer = findLeader();
> try {
> connectToLeader(leaderServer.addr, leaderServer.hostname);
> ..........
> }
> //Observer#observeLeader
> QuorumServer leaderServer = findLeader();
> LOG.info("Observing " + leaderServer.addr);
> try {
> connectToLeader(leaderServer.addr, leaderServer.hostname);
> }{code}
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