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https://issues.apache.org/jira/browse/FLINK-9185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16547791#comment-16547791
 ] 

ASF GitHub Bot commented on FLINK-9185:
---------------------------------------

Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5894#discussion_r203368063
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/PrioritizedOperatorSubtaskState.java
 ---
    @@ -281,10 +281,15 @@ public PrioritizedOperatorSubtaskState build() {
                                // approve-function signaled true.
                                if (alternative != null
                                        && alternative.hasState()
    -                                   && alternative.size() == 1
    -                                   && approveFun.apply(reference, 
alternative.iterator().next())) {
    --- End diff --
    
    Could we wrap this application in 
`BooleanUtils.isTrue(approveFun.apply(reference, 
alternative.iterator().next()))` in order to avoid the extra conditions?


> Potential null dereference in 
> PrioritizedOperatorSubtaskState#resolvePrioritizedAlternatives
> --------------------------------------------------------------------------------------------
>
>                 Key: FLINK-9185
>                 URL: https://issues.apache.org/jira/browse/FLINK-9185
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Assignee: Stephen Jason
>            Priority: Minor
>              Labels: pull-request-available
>
> {code}
>         if (alternative != null
>           && alternative.hasState()
>           && alternative.size() == 1
>           && approveFun.apply(reference, alternative.iterator().next())) {
> {code}
> The return value from approveFun.apply would be unboxed.
> We should check that the return value is not null.



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