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https://issues.apache.org/jira/browse/OOZIE-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15988988#comment-15988988
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Robert Kanter commented on OOZIE-2872:
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Did Oozie pass {{null}} or empty string before for {{<arg></arg>}}?
> Address backward compatibility issue introduced by OOZIE-2748
> -------------------------------------------------------------
>
> Key: OOZIE-2872
> URL: https://issues.apache.org/jira/browse/OOZIE-2872
> Project: Oozie
> Issue Type: Bug
> Reporter: Peter Bacsko
> Assignee: Peter Bacsko
>
> OOZIE-2748 introduced a change which eliminates {{null}} arguments in certain
> actions. For example if the argument list in a Java action contains
> {{<arg></arg>}} then Oozie used to pass {{null}} in the args[] array to the
> {{main()}} method.
> After OOZIE-2748, {{null}} elements are removed. However, there are Oozie
> users who actually rely on this behaviour and now their workflows are broken.
> We should add a property which tells Oozie whether nulls should be inserted
> or not.
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