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ASF GitHub Bot commented on ZOOKEEPER-3007:
-------------------------------------------
Github user lujiefsi commented on the issue:
https://github.com/apache/zookeeper/pull/495
@phunt :
I think the reason that @brettKK use RuntimeException to replace NullPointerException
is :(1)NullPointerException is subclass of RuntimeException (2) give the semantic reason
instead ugly NPE.(3)@brettkk may dost not think over what happens when the RTE is thrown.
He/She may just do it due to (2) .
> Potential NPE in ReferenceCountedACLCache#deserialize
> ------------------------------------------------------
>
> Key: ZOOKEEPER-3007
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3007
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.6.0
> Reporter: lujie
> Priority: Major
>
> Inspired by ZK-3006 , I develop a simple static analysis tool to find other Potential
NPE like ZK-3006. This bug is found by this tool ,and I have carefully studied it. But i
am a newbie at here so i may be wrong, hope someone could confirm it and help me improve
this tool.
> h3. Bug describtion:
> callee BinaryInputArchive#startVector will return null:
> {code:java}
> // code placeholder
> public Index startVector(String tag) throws IOException {
> int len = readInt(tag);
> if (len == -1) {
> return null;
> }
> {code}
> and caller ReferenceCountedACLCache#deserialize call it without null check
> {code:java}
> // code placeholder
> Index j = ia.startVector("acls");
> while (!j.done()) {
> ACL acl = new ACL();
> acl.deserialize(ia, "acl");
> }{code}
> but all the other 14 caller of BinaryInputArchive#startVector performs null checker
like:
> {code:java}
> // code placeholder
> Index vidx1 = a_.startVector("acl");
> if (vidx1!= null)
> for (; !vidx1.done(); vidx1.incr()){
> .....
> }
> }
> }
> {code}
> so i think we also need add null check in caller ReferenceCountedACLCache#deserialize
just like other 14 caller
>
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