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What You Will Achieve

After completing this tutorial, you will have:
  • The Gantt extension installed in your Polarion server’s extensions directory
  • A production or evaluation license in place
  • The Polarion configuration cache cleared for clean extension loading
  • A running Polarion server with the Gantt widget available in the widget picker

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Prerequisites

  • Polarion ALM installed and accessible (administrator access required)
  • Server filesystem access to the Polarion installation directory
  • Downloaded distribution — download nextedy_gantt.zip from https://gantt.nextedy.com/download/
This installation requires a Polarion server restart. Plan for a brief maintenance window if this is a production environment.

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Installation Steps

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Step 1: Unpack the Distribution

Unzip the downloaded nextedy_gantt.zip file on your local machine or directly on the server. 
unzip nextedy_gantt.zip
You should see a folder named com.nextedy.polarion.gantt containing the extension files.

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Step 2: Copy the Extension to Polarion

Copy the com.nextedy.polarion.gantt folder into your Polarion extensions directory: 
POLARION_INSTALL_LOCATION/polarion/extensions/
After copying, the directory structure should look like: 
POLARION_INSTALL_LOCATION/
  polarion/
    extensions/
      com.nextedy.polarion.gantt/    <-- new folder

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Step 3: Install the License File

If you have a production license, copy the gantt_lic.json file to the Polarion license directory: 
[POLARION_INSTALL]/polarion/license/gantt_lic.json
Or you can add it later easily from the Administration UI.
In this case, once Gantt is installed, go to Polarion Administration - Nextedy GANTT - License, and attach the license file.
If you do not have a production license, the extension runs in evaluation mode for 30 days. You can install the license later without reinstalling the extension.

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Step 4: Clear the Configuration Cache

Delete the Polarion configuration cache directory: 
[POLARION_INSTALL]/data/workspace/.config
This step is required after every installation or update. The .config directory only holds plugin cache data and is automatically rebuilt on startup. Skipping this step is the most common cause of the Gantt widget not appearing after installation.

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Step 5: Restart the Polarion Server

Restart your Polarion server using your standard procedure (service restart, application server restart, etc.). After the server starts, you should see the Gantt extension listed in the Polarion administration panel.

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Step 6: Verify the Installation

  1. Open Administration and navigate to Nextedy GANTT > Setup. The Setup page confirms the extension installed successfully and shows the Installed Version alongside the Latest Version (for example, 26.6.2.202606151920), with an up-to-date indicator when current. From here you can also open the Changelog, the plugin Download Page, and Create Demo Project.
  2. As a quick functional check, open any Polarion wiki page (LivePage) in Edit mode, click Add Widget, and confirm the Gantt widgets appear in the picker — Work Items > Gantt (Work Items) and Plans > Gantt (Plans) (they are also grouped under the Nextedy category).
  3. Add a Gantt widget (or open a page that already has one); its footer displays the installed version, e.g. Nextedy GANTT 26.6.2.
To explore a ready-made chart, install the demo project.

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Installation Summary

StepActionVerification
1Unzip nextedy_gantt.zipcom.nextedy.polarion.gantt folder exists
2Copy to polarion/extensions/Folder visible in extensions directory
3Copy license to polarion/license/gantt_lic.json in license directory
4Delete data/workspace/.configDirectory removed
5Restart PolarionServer starts without errors
6Verify installationAdministration > Nextedy GANTT > Setup shows installed version; Gantt widgets appear in the widget picker

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Troubleshooting

If you see a message indicating the Gantt widget is not available after installation, the most common cause is a missing cache clear. Follow these steps:
  1. Stop the Polarion server
  2. Delete [POLARION_INSTALL]/data/workspace/.config
  3. Start the Polarion server
If the issue persists after clearing the cache, contact Nextedy support with your server logs.
After installation, the Gantt widget appears in the Polarion widget picker under Work Items > Gantt (Work Items) and Plans > Gantt (Plans). If you do not see these entries, repeat Step 4 and restart.

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Next Steps

Last modified on July 10, 2026