Plugin Manager Doesn't Start Due to 'Duplicate plugin found'
Symptoms
After recently installing a plugin either by placing the jar file in <JIRA-HOME>/plugins/installed-plugins/ directory or via the Administration > Plugins page, JIRA's Plugin Manager fails to start up with the following message:
Error occurred while starting Plugin Manager. Duplicate plugin found (installed version is the same or older) and could not be unloaded: 'com.atlassian.upm.atlassian-universal-plugin-manager-plugin'
Cause
There are two different versions of a plugin installed onto the JIRA server.
Resolution
Remove all versions of the plugin and re-install the latest compatible version.
A plugin may have been installed in the following locations depending on whether or not it is a Version 2 or Version 1 plugin:
- First, shutdown JIRA
Version 2:
- Plugin files are located within:
<JIRA-HOME>/plugins/installed-plugins/ - Remove any *.jar files associated with the problematic plugin
- Plugin files are located within:
Version 1:
- Plugin files are generally located within: <JIRA-INSTALL>/atlassian-jira/WEB-INF/lib
Note that the plugin may have special instructions beyond the norm. In this case, please refer to the plugin's installation documentation for further info.
- Remove any *.jar files associated with the problematic plugin
- Plugin files are generally located within: <JIRA-INSTALL>/atlassian-jira/WEB-INF/lib
- Restart JIRA once files have been removed
- Re-install the plugin via JIRA's Add-on Manager
Last modified on Mar 30, 2016
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