Cannot upgrade bundled OSGI plugins (e.g. Activity Stream plugin)

Steps to reproduce:

1. Install JIRA 4.0.1 Standalone.
2. Before running JIRA, "upgrade" the bundled Activity Stream plugin by copying it from the .bundled-plugins folder into the installed-plugins folder.
3. Start JIRA

Symptoms:

• Activity Stream loads but shows no activity (no error response is thrown, just no activity)
• No error messages about loading the plugin in the logs

What seems to be happening here is that there is a problem when uninstalling the bundled plugin and then installing the "new" version. After debugging the code we've observed that the PluginAccessor throws a NullPointerException when trying to access the Module from the Descriptor.

This is fixed in JIRA 4.1 with a newer version of Felix, so it only affects 4.0.x releases.

References:

• http://code.google.com/p/couldit-autoexport/issues/detail?id=24#c0