Plugin resulting in "Method Not Allowed" after Confluence 9 upgrade

Question

Hi

We have a custom plugin that worked well with Confluence 8.5.21 and now I'm trying to get it working for Confluence 9.2.4. I managed to upgrade and bundle all required dependencies so that it installs without error again.

However, when I now access the global plugin configuration or the per-space configuration, I simply get a page showing "Method Not Allowed":

I have no clue in which direction to search... nothing is logged in the atlassian-confluence.log file. Which method isn't allowed? Has Confluence become more restrictive? Or did my code changes (e.g. deprecated SettingsManager replaced with PluginSettingsFactory) have some unintended side-effect?

Any hints, ideas, or solutions would be highly appreciated.

Regards
Dominik

Dominik · Answer

In the meantime, I found a very related question in the Developer forum (thanks for the hint, @Piyush Annadate _ACE Pune_) that suggests to use a doDefault() method instead of execute(). And that "magically" did the trick... no clue why.

Now my 'View' actions work: the global and per-space configuration forms are displayed.

(However, clicking on the 'Save' button now leads to HTTP 403 Forbidden errors and I haven't figured out yet why that happens... but that's now a new problem)

Piyush Annadate _ACE Pune_ · Answer

Best would be to post this over Developer forum - https://community.developer.atlassian.com/

Dominik · Answer

Hi @Piyush Annadate _ACE Pune_. Thanks a lot for the quick reply. I will check the other logs. Yes, the plugin worked perfectly with Confluence 8.5.21 (and many versions before that). It's a rather simple plugin to embed some diagrams on pages, but it also has a per-space and global configuration whose links show up in Confluence 9, but clicking on them causes the "Method Not Allowed". For example, when installing the plugin and clicking on the 'Configure' button that appears in the Manage Apps screen, the URL it accesses is: * confluence/admin/eadiagram/ea-global-config-view.action The atlassian-plugin.xml contains (among other things): /admin/eadiagram/ea-global-config-view.action And then it contains:

/templates/ea-global-config.vm /admin/eadiagram/ea-global-config-view.action

... This has all worked fine before, so I'm confused if any of this is no longer valid in Confluence 9. Is there maybe a guide on how to migrate plugins from Confluence 8 to 9? Regards Dominik