[jboss-jira] [JBoss JIRA] (DROOLS-2458) [DMN Designer] Error while removing connected decision

[Michael Anstis (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-2458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13558197#comment-13558197 ] 

Michael Anstis commented on DROOLS-2458:
----------------------------------------

Stack trace is this:-
{code}
LgI_g$ (FormPropertiesWidget.java:150)
TgI_g$ (FormPropertiesWidget.java:79)
vhI_g$ (FormsCanvasSessionHandler.java:213)
uhI_g$ (FormsCanvasSessionHandler.java:205)
giI_g$ (FormsCanvasSessionHandler.java:256)
TVF_g$ (AbstractCanvasHandler.java:363)
qeG_g$ (DeleteCanvasConnectorCommand.java:51) <-- context.notifyCanvasElementUpdated(target) -- see below.
peG_g$ (DeleteCanvasConnectorCommand.java:40)
...
{code}
The {{DeleteCanvasConnectorCommand}} above looks like this:-
{code}
public class DeleteCanvasConnectorCommand extends AbstractCanvasCommand {
    ...
    @Override
    public CommandResult<CanvasViolation> execute(final AbstractCanvasHandler context) {
        if (!checkShapeNotNull(context, candidate.getUUID())) {
            //it is already not present on canvas
            return buildResult();
        }

        context.deregister(candidate);
        if (null != source) {
            context.notifyCanvasElementUpdated(source);
        }
        if (null != target) {
            context.notifyCanvasElementUpdated(target); <-- BUT target has been deleted.
        }
        return buildResult();
    }
{code}
So the issue is that the Properties Panel is trying to be updated for a non-existence node.

> [DMN Designer] Error while removing connected decision
> ------------------------------------------------------
>
>                 Key: DROOLS-2458
>                 URL: https://issues.jboss.org/browse/DROOLS-2458
>             Project: Drools
>          Issue Type: Bug
>          Components: DMN Editor
>    Affects Versions: 7.8.0.Final
>            Reporter: Jozef Marko
>            Assignee: Michael Anstis
>            Priority: Critical
>             Fix For: 7.8.0.Final
>
>         Attachments: Screenshot from 2018-04-06 14-41-28.png, Screenshot from 2018-04-06 14-42-45.png
>
>
> If there are connected decisions, user is unable to delete them. Issue was found during JBPM-6777 review, however probably there is no relation.
> h2. Acceptance test
> Prepare DRG diagram with all combinations of connections, be sure all node types used, try to delete each node type in situation it is either source or target of connection.



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