Code Macro Plugin offers update in Confluence 5.5. but is incompatible

Summary

In Confluence 5.5.x when going to > Add-ons, Code Macro Plugin offers a message to upgrade to a newer version (from 2.1.3 to 2.2.4). This new version doesn't work and generates errors in the log.

Other Add-Ons are also listed, and may also be broken.

Environment

• Confluence 5.5.x
• Java 7
• Code Macro Plugin 2.1.3 (the system default)

Steps to Reproduce

1. Go to > Add-ons
2. Confirm there's an Update button for Code Macro Plugin
3. Click Update

Expected Results

Plugin is updated to 2.2.4
or
No option to update

Actual Results

Message appears
The below exception is thrown in the atlassian-confluence.log file:

2016-03-24 13:07:51,461 ERROR [UpmAsynchronousTaskManager:thread-2] [atlassian.plugin.loaders.ScanningPluginLoader] deployPluginFromUnit Unable to deploy plugin 'com.atlassian.confluence.ext.newcode-macro-plugin' from 'Unit: /home/jrichards/atlassian/data/atlassian-confluence-5.5/plugins-cache/1458785271319plugin.8528292429045245180.newcode-macro-plugin-2.2.4.jar (1458785271000)'.
 -- referer: http://jrichards.office.atlassian.com:8090/plugins/servlet/upm | url: /rest/plugins/1.0/ | userName: jrichards
2016-03-24 13:07:51,463 ERROR [UpmAsynchronousTaskManager:thread-2] [atlassian.plugin.loaders.ScanningPluginLoader] deployPluginFromUnit Because of the following exception:
 -- referer: http://jrichards.office.atlassian.com:8090/plugins/servlet/upm | url: /rest/plugins/1.0/ | userName: jrichards
com.atlassian.plugin.PluginParseException: Unable to scan for host components in plugin classes

Notes

Confluence 5.7.5 does not offer to update the Code Macro Plugin

Workaround

1. Stop Confluence
2. Run this to confirm data is in the table

   select plugindataid, pluginkey, filename, lastmoddate from plugindata where pluginkey = 'com.atlassian.confluence.ext.newcode-macro-plugin';
   

3. If there's only one row where pluginkey is com.atlassian.confluence.ext.newcode-macro-plugin run

   delete from plugindata where pluginkey = 'com.atlassian.confluence.ext.newcode-macro-plugin';
   

4. Delete all the files in the plugin cache (with rm -fr):
   • /var/atlassian/application-data/confluence/bundled-plugins
   • /var/atlassian/application-data/confluence/plugins-cache
   • /var/atlassian/application-data/confluence/plugins-osgi-cache
   • /var/atlassian/application-data/confluence/plugins-temp
   • /var/atlassian/application-data/confluence/bundled-plugins_language
5. Restart Confluence

or

1. Go to https://marketplace.atlassian.com/plugins/com.atlassian.confluence.ext.newcode-macro-plugin/versions
2. Download version for 2.1.4
3. Go to > Add-ons
4. Click upload
5. Add newcode-macro-plugin-2.1.4.jar and upload