Pass Custom JVM Parameters in Liberty Tools Plugin | Generated by AI

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You can pass custom JVM parameters—like -Dversion=5.1—by adding them to your Liberty dev mode launch configuration in VS Code. Typically, you do this by editing (or creating) the .vscode/launch.json file in your project and including the parameter under a property like "vmArgs" (or "args" if your configuration expects Maven goal arguments).

For example, if you’re using the Liberty Tools extension with dev mode, your configuration might look like this:

{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "liberty",
      "request": "launch",
      "name": "Liberty Dev Mode",
      "goal": "dev",
      "vmArgs": "-Dversion=5.1"
    }
  ]
}

Steps:

  1. Open or Create the Launch Configuration:
    • In VS Code, open your project.
    • Navigate to the .vscode folder and open (or create) launch.json.
  2. Add Your Dev Mode Configuration:
    • Add a configuration entry as shown above. The key "vmArgs" lets you specify JVM options that will be passed to the server when dev mode starts.
  3. Save and Launch:
    • Save the file.
    • Use the Run and Debug view to start the “Liberty Dev Mode” configuration.

If you’re using Maven directly, you could also start dev mode from the command line with:

mvn liberty:dev -Dversion=5.1

This passes the custom property to the JVM when starting the server.

By configuring it this way, the Liberty Tools extension will include your custom parameter (-Dversion=5.1) each time you start dev mode.

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