Issue Summary

After uninstalling Jira Service Management, the jira-email-processor-plugin is disabled, which causes any further reinstallation of Jira Service Management to fail due to dependency issues. 

Steps to Reproduce

1. Install a fresh instance of Jira Software 8.13.4 - 8.13.7
2. Install Jira Service Management
3. Uninstall Jira Service Management
4. Reinstall Jira Service Management

Expected Results

Jira Service Management reinstalls successfully

Actual Results

Reinstallation will hang for approximately 5 minutes until a timeout occurs, where Jira Service Management will look like it is installed, but multiple plugins are not enabled and the application is nonfunctional:

Workaround

Workaround to reinstall JSM, without upgrading JSM:

1. Uninstall JSM via Administration >> Applications >> Versions & licenses using the Uninstall button underneath the JSM application
2. Stop Jira
3. Run the following SQL query directly against the DB:

DELETE FROM pluginstate WHERE pluginkey = 'com.atlassian.jira.jira-email-processor-plugin';

4. Physically remove $JIRA_HOME/plugins/installed-plugins/jira-email-processor-plugin-x.xx.x.jar
5. Start Jira
6. Reinstall JSM

Workaround to reinstall JSM with upgrade to a fixed version (no DB alteration or restart required):

1. Uninstall existing JSM
2. Install JSM in version 4.5.16+ (LTS), 4.13.8+ (LTS), 4.16.2+ or 4.18.0+ appropriate for your instance
3. Uninstall JSM again
4. Navigate to: Manage Apps -> All apps -> find jira-email-processor-plugin -> click Enable button
5. Install JSM again