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https://issues.apache.org/jira/browse/ISIS-1264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17288353#comment-17288353
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ASF subversion and git services commented on ISIS-1264:
-------------------------------------------------------
Commit fe048cbdfd336842829117709ecf75de975d6e04 in isis's branch
refs/heads/master from Andi Huber
[ https://gitbox.apache.org/repos/asf?p=isis.git;h=fe048cb ]
ISIS-1264: No-arg actions returning Blob/Clob but whose return type is
simply java.lang.Object no longer require AjaxDeferredBehaviour
> No-arg actions returning Blob/Clob but whose return type is simply
> java.lang.Object throw exception.
> ----------------------------------------------------------------------------------------------------
>
> Key: ISIS-1264
> URL: https://issues.apache.org/jira/browse/ISIS-1264
> Project: Isis
> Issue Type: Improvement
> Components: Isis Viewer Wicket
> Affects Versions: 1.10.0
> Reporter: Daniel Keir Haywood
> Assignee: Andi Huber
> Priority: Minor
> Fix For: 2.0.0-M5
>
>
> For example:
> {code}
> public Object downloadThis() {
> return new Clob(...);
> }
> {code}
> there are two possible workarounds; either:
> a) return Clob (or Blob) instead of Object
> {code}
> public Clob downloadThis() {
> return new Clob(...);
> }
> {code}
> b) make the action take one or more args (not be a no-arg):
> {code}
> public Object downloadThis(String filename) {
> return new Clob(...);
> }
> {code}
> ~~~
> In more detail:
> The ActionLinkFactoryAbstract class has a utility method
> determineDeferredBehaviour that figures out from the actionModel whether this
> is an action with no args and returning either a Clob/Blob or a URL (that
> also requires special handling). It has to do so by looking at the action
> signature, ie the compile-time return type. If the action matches, we get
> back an AjaxDeferredBehaviour callback handler, and this is what is used to
> handle the ajax request if the action's link is subsequently clicked.
> If the action doesn't conform to this, then we just get a regular
> AbstractAjaxDefaultBehaviour.
> Later on, though, when we invoke the action (ActionPanel), we use this code:
> {code}
> ActionResultResponse resultResponse =
> ActionResultResponseType.determineAndInterpretResult(this.getActionModel(),
> target, resultAdapter);
> resultResponse.getHandlingStrategy().handleResults(this,
> resultResponse);
> {code}
> which inspects the returned object and figures out the right way to "return"
> it. In the case of a Blob/Clob the selecting handlingStrategy basically
> assumes that an AjaxDeferredBehaviour has been set up. If it wasn't, then
> everything blows up.
> ~~~
> Don't know how to fix this. Perhaps Martin has a solution.
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