Using Developer Mode with Themes

Do you want to develop themes without having to redeploy to see your modifications? Use Developer Mode! In Developer Mode, all caches are removed, so any changes you make are visible right away. Also, you don’t have to reboot the server as often in Developer Mode.

How does Developer Mode let you see your changes more quickly? By default, Liferay DXP is optimized for performance. Developer mode optimizes your configuration for development instead. Here is a list of Developer Mode’s key behavior changes and the Portal Property override settings that trigger them (if applicable):

  • CSS files are loaded individually rather than being combined and loaded as a single CSS file (
  • Layout template caching is disabled (layout.template.cache.enabled=false).
  • The server does not launch a browser when starting (browser.launcher.url=).
  • FreeMarker Templates for themes and web content are not cached, so changes are applied immediately (via the system setting in your Liferay DXP instance).
  • Minification of CSS and JavaScript resources is disabled (minifier.enabled=false).

Individual file loading of your styling and behaviors, combined with disabled caching for layout and FreeMarker templates, lets you see your changes more quickly. These developer settings are defined in the file. To use these settings, you can include them in your file or copy them over to your file and override specific properties as needed. These configurations are covered in this tutorial.

First, you can explore how it’s done in Dev Studio DXP.

Setting Developer Mode for Your Server in Dev Studio

To enable Developer Mode for your server in Dev Studio DXP, follow these steps:

  1. Double-click on your server in the Servers window and open the Liferay Launch section.

  2. Select Custom Launch Settings and check the Use developer mode option.

  3. Save the changes and start your server.

Figure 1: The Use developer mode option lets you enable Developer Mode for your server in Dev Studio DXP.

Figure 1: The *Use developer mode* option lets you enable Developer Mode for your server in Dev Studio DXP.

When starting your server for the first time, it creates a file in your server’s directory. This properties file contains the property setting, which enables Developer Mode. Most of the configuration is provided by the file, but you still have to configure the FreeMarker template setting. Follow the steps in the Configuring FreeMarker System Settings section to configure the FreeMarker template cache.

If you’re not using Dev Studio DXP, manual configuration for Developer Mode is covered next.

Setting Developer Mode for Your Server Using

To set Developer Mode manually, you must point to as shown in the last section. Add the file to the root folder of your app server’s bundle and add the following line:

Developer Mode is enabled upon starting your app server. provides the majority of the settings you’ll need for smooth development. To disable the cache for FreeMarker templates, you must update the System Setting covered in the next section.

Configuring FreeMarker System Settings

FreeMarker Templates for themes and web content are cached by default. Therefore, any changes you make to your FreeMarker theme templates aren’t immediately displayed. You can change this behavior through System Settings. Follow these steps:

  1. Open the Control Panel and go to ConfigurationSystem Settings.

  2. Select Template Engines under the PLATFORM heading.

  3. By default, the Resource modification check (the time in milliseconds that the template is cached) is set to 60000. Set this value to 0 to disable caching.

Your FreeMarker templates are ready for development. Next you can learn how you can improve JavaScript file loading for development.

JavaScript Fast Loading

By default, JavaScript fast loading is enabled in Developer Mode ( This loads the packed version of files listed in the Portal Properties javascript.barebone.files or javascript.everything.files. You can, however, disable JavaScript fast loading for easier debugging for development. Just set to false in your, or you can disable fast loading by setting the URL parameter js_fast_load to 0.

Great! You’ve set up your server for Developer Mode. Now, when you modify your theme’s file directly in your bundle, you can see your changes applied immediately on redeploying your theme!

Creating Layout Templates Manually

Creating Themes with Dev Studio DXP

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