Weasis Plug-in Development

This page describes the necessary configurations to be able to debug Weasis using an IDE. For developers who want to create new plug-ins, you can visit How to build and install a plug-in.

We recommend the use of IntelliJ IDEA because the following instructions are based on it. Nevertheless, it is possible to use other IDEs by configuring weasis-launcher with similar instructions described in Add a launcher.


  1. Install IntelliJ IDEA (Community or Ultimate Edition 2024.1 or higher)
  2. Use JDK 22 or higher and set the language level to 22 - Unamed variables and patterns in _File > Project Structure… > .
  3. In File > Settings… > Plugins install google-java-format plugin from Marketplace and enable it from google-java-format Settings

Code style and convention

Weasis uses google-java-format as coding conventions. The format can be applied by Maven through the Spotless plugin or from the IDE (by importing the IntelliJ Java Google Style file). Formatting code with an IDE is not 100% compatible with Spotless, so it is better to use the latter before submitting new commits. This guarantees identical code formatting regardless of the system or code editor used.

  • From Maven command: mvn spotless:apply
  • From the Maven panel Maven Spotless Maven Spotless

Getting the source and building Weasis

  • Getting the Source
    • For external Git client, see Building Weasis.
    • From IntelliJ IDEA: New > Project from Version Control…
      • In the Get from Version Control dialog, select the menu Repository URL and enter the following URL: (public repository)
  • Building Weasis plug-ins
    • In the maven panel, select clean/install in Lifecycle of weasis-framework (root) to compile and to install all the plug-ins in the local Maven repository.
  • It is possible to use a JVM Option (e.g. -Dweasis.arch=linux-x86-64) to limit the build of native plugins only to the architecture of the current system (do not use this option when building the distribution).
  • See also building the final Weasis Distributions

Add a launcher

For running or debugging Weasis, you need to create a launcher:

  • Open Run > Edit Configurations…

  • Create a new Application

    • Select weasis-launcher as a module (field starting by -cp)
    • Main Class: browse org.weasis.launcher.AppLauncher
    • Click on Modify Options
      • Select Add dependencies with “Provided” scope to classpath
      • Select Do not build before run
      • Select Add VM Options and enter -Xms64m -Xmx768m -Dgosh.port=17179
    • Working Directory: remove the current value and add %MODULE_WORKING_DIR% from the Insert Macros button Launcher Configuration Launcher Configuration

      As the default build task has been removed it is necessary to apply the Maven command install on modules with modified code before launching the Run or Debug mode.
      Keeping the build task and delegating the build to Maven does not seem configurable for a multi-module project, see this issue.

  • Examples of launching parameters by entering values in the Program arguments text box

    • Loading DICOM files from a local path:
      $dicom:get -l \"D:\images test\dicom\"

      Some command interpreters need to escape the quotes or double quotes required for paths or URLs. This is the case with IntelliJ IDEA or Eclipse.
      For more commands at startup see also Weasis commands.


      In Eclipse launcher parameters, ‘&’ within URLs needs to be escaped with a backslash.

  • Examples of other VM options for overriding the default Preferences

    • Removing the possibility of exporting DICOM: -Dweasis.export.dicom=false
    • Defines a new user (for getting specific preferences): -Dweasis.user=user1
    • Examples with specific configuration files:
      • For launching Weasis Dicomizer:
      • Configuration from an URL:
        Note defines the location of (the OSGI configuration and the list of plug-ins to install/start) defines the location of (extends/overrides