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Posted to dev@tapestry.apache.org by "Daniel Caldeweyher (JIRA)" <de...@tapestry.apache.org> on 2008/10/23 08:32:44 UTC
[jira] Issue Comment Edited: (TAPESTRY-2714) NPE during
DojoAjaxResponseBuilder.beginResponse after async submit after "back"
button
[ https://issues.apache.org/jira/browse/TAPESTRY-2714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12642077#action_12642077 ]
dcalde edited comment on TAPESTRY-2714 at 10/22/08 11:31 PM:
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This tapestry user appears to have the same problem:
http://markmail.org/message/wn4cqdd6zbc3325v
But his message never got a reply.
was (Author: dcalde):
This tapestry user appears to have the problem:
http://markmail.org/message/wn4cqdd6zbc3325v
But his message never got a reply.
> NPE during DojoAjaxResponseBuilder.beginResponse after async submit after "back" button
> ---------------------------------------------------------------------------------------
>
> Key: TAPESTRY-2714
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2714
> Project: Tapestry
> Issue Type: Bug
> Affects Versions: 4.1.5, 4.1.6
> Reporter: Daniel Caldeweyher
>
> Hi,
> we are getting a NPE during form rewind after using the back button back to a page that contains a @PropertySelection with an async onchange @EventListener. If this event listener is triggered, the _writer inside the DojoAjaxResponseBuilder is null, causing an NPE. It works correctly if the page is accessed normally, ie. not via back button.
> Should beginResponse even be called during rewind?
> Also, if the methods in DojoAjaxResponseBuilder were using getWriter() instead of _writer directly. this could be fixed by replacing
> public IMarkupWriter getWriter()
> {
> return _writer;
> }
> with
> public IMarkupWriter getWriter()
> {
> if(_writer == null)
> {
> return NullWriter.getSharedInstance();
> }
> return _writer;
> }
> here is the stacktrace:
> Caused by: java.lang.NullPointerException
> at org.apache.tapestry.services.impl.DojoAjaxResponseBuilder.beginResponse(DojoAjaxResponseBuilder.java:696)
> at org.apache.tapestry.services.impl.DojoAjaxResponseBuilder.getWriter(DojoAjaxResponseBuilder.java:665)
> at org.apache.tapestry.services.impl.DojoAjaxResponseBuilder.getComponentWriter(DojoAjaxResponseBuilder.java:653)
> at org.apache.tapestry.services.impl.DojoAjaxResponseBuilder.render(DojoAjaxResponseBuilder.java:629)
> at org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:538)
> at org.apache.tapestry.components.Any.renderComponent(Any.java:44)
> at org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:724)
> at org.apache.tapestry.services.impl.DojoAjaxResponseBuilder.render(DojoAjaxResponseBuilder.java:635)
> at org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:538)
> at org.apache.tapestry.form.FormSupportImpl.rewind(FormSupportImpl.java:624)
> at org.apache.tapestry.form.Form.renderComponent(Form.java:196)
> at org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:724)
> at org.apache.tapestry.services.impl.DojoAjaxResponseBuilder.render(DojoAjaxResponseBuilder.java:635)
> at org.apache.tapestry.form.Form.rewind(Form.java:269)
> at org.apache.tapestry.engine.RequestCycle.rewindForm(RequestCycle.java:469)
> ... 40 more
> we thought that maybe preventBackButtonFix: false might help, but it was not related.
> Thanks,
> Daniel
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