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https://issues.apache.org/jira/browse/ACE-41?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12761903#action_12761903
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Angelo van der Sijpt commented on ACE-41:
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There are two possible solutions for this issue, either we change the behavior
of this button, or we change the association mechanism to use Drag and drop
(code.google.com/p/gwt-dnd ).
> [webui] Error creating association: java.lang.NullPointerException
> ------------------------------------------------------------------
>
> Key: ACE-41
> URL: https://issues.apache.org/jira/browse/ACE-41
> Project: Ace
> Issue Type: Bug
> Components: Web UI
> Reporter: Filippo Diotalevi
>
> When the user clicks on the <-> (create association) button (any of them)
> without selecting the elements to associate, a popup saying "Error creating
> association: java.lang.NullPointerException" is displayed.
> A more "user friendly" message should be displayed instead (or no message at
> all).
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