Prerequisites

• You need to know how to start a Confluence plugin,
• Use Java 11
• Use Maven 3.8.6 (for example),
• Use Atlassian's Maven repositories configured in Maven (or use the Atlassian SDK instead of Maven).

How to show the bug

• Start Confluence[1]
• Install this plugin
• Install Scaffolding 8.29.10
• Create a page with Scaffolding:
  • Create a page,
  • Put the macro "Text Data" (by Scaffolding) on it,
  • In "Field Name", type "text-1",
  • Save the page,
  • Click "Edit Contents" to add contents to the Scaffolding macro,
• While you are viewing the page, click the "CLICK HERE TO SHOW THE BUG" link in the top bar,
• A white page with the (correct) rendering appears,
• Bug: Look at the logs, there is a large stacktrace in it.

Why is this stacktrace considered a bug?

• Other plugins render pages many times with Scaffolding on it,
• Scaffolding will then fill the logs and provoke the disk to fill up and crash Confluence,
• There is no way to prevent Scaffolding from displaying this stacktrace,

What is happening technically?

• The rendering is called in a separate thread, so there is no current "HttpRequest" or currently-logged-in user,
• Scaffolding seems to call a method from ServletActionContextCompatManager.getRequest(), in an old version, which triggers an exception because it is not in the context of an HttpRequest,
• Then, instead of ignoring the absence of "HttpRequest" as should be, Scaffolding seems to log the exception without any way for anyone to prevent it.

Video demonstration

See demo-how-to-run.mp4

Tracking

This is tracked by https://appfire.atlassian.net/servicedesk/customer/portal/11/SUPPORT-174435

[1] How to start Confluence?

• Go to the folder of the project where the pom.xml is,
• Ensure you have Java 11: java -version will certainly tell you,
• Run mvn amps:debug,
• Wait for Confluence 8.5.4 to start,
• The login is admin/admin,
• In a separate window, ensure you have Java 11, then recompile the plugin and it will install automatically: mvn install.