If you have already been using Atlassian JIRA, and are now configuring JIRA as a Crowd application, you will probably want to import your existing JIRA users and groups into a Crowd directory.
To import users and groups from Atlassian JIRA into a Crowd directory,
- Login to the Crowd Administration Console.
- Click the 'Principals' link in the top navigation bar.
- This will display the Principal Browser. Click the 'Import Users' link.
- This will display the 'Import Type' screen. Click the 'JIRA' button.
- This will display the 'Options' screen. Complete the fields as follows:
- 'Directory' — select the directory that is mapped to the JIRA application.
- 'DB URL' — type the URL of your JIRA instance's database.
- 'DB Driver' — type the name of your JIRA instance's database JDBC driver.
- 'Username' — type the username of the database user that Crowd will use to login to your JIRA instance's database.
- 'Password' — type the password of the database user Crowd will use to login to your JIRA instance's database.
The import process will log in to the database, not to JIRA.
- Click the 'Continue' button to import the users from your JIRA instance into your Crowd directory.
- The 'Status' screen will be displayed, showing how many users and groups have been imported into your Crowd directory.
- Click the 'Principals' button to view and manage the imported users and groups via the Crowd Administration Console (assuming the directory's permissions allow this).
Screenshot: 'Import JIRA Users'

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To give the imported groups access to the JIRA application, see 3.4 Specifying which Groups can access an Application.
Crowd 1.0 Documentation