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https://issues.apache.org/jira/browse/FALCON-2073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Ying Zheng updated FALCON-2073:
-------------------------------
    Description: 
Coverity scan finds a few places where the return value of an object could be 
NULL but Falcon tries to access its member without handling with the corner 
NULL case. For example, in OozieWorkflowEngine::updateDependents, we will run 
into an error if there is no dependency edge for the oldEntity:

{code}
        Set<Entity> affectedEntities = 
EntityGraph.get().getDependents(oldEntity);
        for (Entity affectedEntity : affectedEntities) {
                 ......
        }
{code}

  was:
Coverity scan finds quite a few places where the return value of an object 
could be NULL but Falcon tries to access its member without handling with the 
corner NULL case. For example, in OozieWorkflowEngine::updateDependents, we 
will run into an error if there is no dependency edge for the oldEntity:

{code}
        Set<Entity> affectedEntities = 
EntityGraph.get().getDependents(oldEntity);
        for (Entity affectedEntity : affectedEntities) {
                 ......
        }
{code}


> Handle with NULL corner cases
> -----------------------------
>
>                 Key: FALCON-2073
>                 URL: https://issues.apache.org/jira/browse/FALCON-2073
>             Project: Falcon
>          Issue Type: Bug
>            Reporter: Ying Zheng
>            Assignee: Ying Zheng
>
> Coverity scan finds a few places where the return value of an object could be 
> NULL but Falcon tries to access its member without handling with the corner 
> NULL case. For example, in OozieWorkflowEngine::updateDependents, we will run 
> into an error if there is no dependency edge for the oldEntity:
> {code}
>         Set<Entity> affectedEntities = 
> EntityGraph.get().getDependents(oldEntity);
>         for (Entity affectedEntity : affectedEntities) {
>                  ......
>         }
> {code}



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