Weasis Plug-in Development

This page is intended for developers who want to contribute to Weasis and it is a recommendation for developers who want to create their own plug-ins, see also How to build and install a plug-in.

We recommend the use of Eclipse IDE, because all the following instructions are based on it and some settings and the coding conventions can be imported directly into Eclipse. Nevertheless, for having a better Maven integration, it is possible to use IntelliJ IDEA or Netbeans by configuring weasis-launcher with similar instructions described in Debug or Run from Eclipse.


  1. JDK 11 or higher
  2. Recent version of Eclipse IDE for Java Developers

Configure Eclipse

  • You can edit the VM options of the eclipse.ini file in your eclipse folder. For instance, the maximum memory for the JVM or the JVM location can be specified.
  • Start Eclipse and select the path of the Weasis workspace

    It is recommended to create a new Workspace for keeping a specific Weasis configuration.

  • Go to Window > Preferences > Java > Installed JREs > Execution Environments and select the installed JDK
  • In Window > Preferences > General > Workspace
    • Select UTF-8 for Text file encoding
    • Select Unix for New text file line delimiter

Code style and convention

Weasis adheres to the Java Language Specification. Here are some code style specifications:

  1. Maximum line length is 120 characters.
  2. Use spaces instead of tabs.
  3. Indentation size is 4 spaces.
  4. Do not insert a new line before opening brace. Insert a new line before closing brace.
  5. Use fully qualified import statements, i.e. do not use asterisks.

Code style specifications can be imported into Eclipse:

  1. Download the Weasis code style format
  2. In Window > Preferences > Java > Code Style > Formatter, click on Import and select the weasis-eclipse-formatting.xml file
  3. Press OK after importing
  1. Download the Weasis clean up code style
  2. In Window > Preferences > Java > Code Style > Clean Up , click on Import and select the weasis-eclipse-cleanup.xml file
  3. Press OK after importing
  1. Download the Weasis code template
  2. In Window > Preferences > Java > Code Style > Code Templates , click on Import and select the weasis-code-style-template.xml file
  3. Press OK after importing

Getting the source and building Weasis from Eclipse

  • Getting the Source
    • For external Git client, see Building Weasis.
    • From Eclipse Git perspective: Window > Open Perspective > GIT Repository Exploring. Click on button “Clone a GIT repository”.
    • In the New dialog, Add one of the following URIs:
      • (public repository)
    • Press, Next and then Finnish
    • From Eclipse menu, open File > Import…
    • In the New dialog, select Maven > Existing Maven Projects, click Next and select the “Weasis” or “weasis-dev” directory.
    • As it is generally not necessary to get all the Maven projects visible into Eclipse, Deselect All and select only the plugins you are interested in (at least weasis-launcher and weasis-framework).
  • Building Weasis plug-ins

    • Select the weasis-framework project (or the pom.xml in the project)
    • Right click, Run as > Maven Install (Compiling and installing all the plug-ins in the local Maven repository)
    • Or run a custom Maven build entry in the Run As menu
      • Example for building Weasis
      • Select the weasis-framework project
      • Right click, Run as > Run Configurations… Maven configuration

        Getting errors on the projects. Try the following instructions:

        • Right-click on the project and Maven > Update Project Configuration
        • Right-click on the project and select Refresh
        • Project > Update All Maven Dependencies
        • Project > Clean all projects
        • Right-click Close Project and then Open Project

        If you have Maven installed on your system or TM terminal Eclipse plugin, it is sometimes easier to type the maven commands directly in a console.

  • Building Weasis Distributions

    • Requires to have installed all the plug-ins as described just the item above
    • If weasis-distributions project is not in the Package Explorer list, import it:
      • Open File > Import…
      • In the Import dialog, select Maven > Existing Maven Projects, click Next
      • Click on Browse and select the weasis-distributions folder (in yourWorkspace/weasis-framework)
      • Press Select All and Finnish
    • Select the weasis-distributions project
    • Right click, Run as > Maven Install

      The distribution files are located in the target/dist folder of the project.
      See Building Weasis from source for more advanced options.

Debug or Run from Eclipse

For debugging Weasis, you need to create a Debug configuration:

  • Open Run > Debug Configurations…
  • Create a new Java Application
  • In the Main tab, enter:
    • Project: weasis-launcher
    • Main Class: org.weasis.launcher.WeasisLauncher
  • In the Arguments tab
    • Program arguments, examples for loading DICOM locally:
      $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 Eclipse.
      For more commands at startup see also Weasis commands.

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

    • VM arguments, minimal configuration:
      -Xms64m -Xmx768m -Dgosh.args="-sc telnetd -p 17179 start"
    • Other VM arguments, exemples with specific configuration files:
      • For Launching Weasis Dicomizer:
      • Configuration from an URL:

        Meaning of the properties (see also Preferences): defines the location of (the OSGI configuration and the list of plug-ins to install/start) defines the location of (extends/overrides