To be able to execute graphs, CloverETL Server requires a valid license. You can install and run CloverETL Server without any license, but no graph will be executed.

There are three ways of installing the license. They work on all application servers and can be used at the same time, but only the most recent valid license is used.

We recommend using the first and easiest option (for other options, see CloverETL Server Activation Alternatives):

CloverETL Server Activation using Web Form

If the CloverETL Server has been started without assigning any license, click the Activate server link on the welcome page. You will be redirected to the Add New License form where you can upload the license file using the Browse button, or simply copy the license from the file and paste it into the License key text field.

Login page of CloverETL Server without license

Figure 6.10. Login page of CloverETL Server without license

After clicking the Update button, the license is validated and saved to the database table clover_licenses. If the license is valid, a table with license's description appears. To proceed to CloverETL Serve console click Continue to server console.

You can skip adding a license by clicking the Close button.

Add new license form

Figure 6.11. Add new license form

Updating CloverETL Server License in the Configuration Section

If the license has been already installed, you can still change it by using form in the Server web GUI.

You can paste a license text into a License key text area or use the Browse button to search for a license file in the filesystem. To skip adding a license, click the Close button.

After clicking the Update button, the license is saved to the database table clover_licenses and reloaded.

Update license form

Figure 6.12. Update license form


The CloverETL license can be changed at any time by replacing license.dat file. Afterwards, you have to let CloverETL Server know the license has changed.

  • Go to server web GUIConfigurationSetupLicense

  • Click Reload license.

  • Alternatively, you can restart the CloverETL Server application.


The license in the database is common for all nodes in the cluster. Reloading of the license occurs on each node in the cluster.

Continue with:  Chapter 12, Setup