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The WollMux is a LibreOffice plugin with enhanced template, form, and autotext functionality. It can construct templates on the fly from multiple files (e.g. letterhead, footer, and body text) and will fill in personal and organizational data from various databases such as LDAP. An extra form GUI presents fields in an easily navigable manner and offers plausibility checks and computed values to ease filling in the form. Chainable printing functions allow various transformations during print and custom dialogs.

WollMux is licensed under the European Union Public Licence (EUPL -

More information about WollMux can be found at our main page at

How to build?

WollMux is separated into 3 modules:

The following applications have to be installed to compile WollMux:

Afterwards the property UNO_PATH has to be set in the maven settings.

  • open ~\.m2\settings.xml
  • add a profile
  • <UNO_PATH> is the folder, where the LibreOffice executable is located (eg. /opt/libreoffice/program)

Perform the following commands to download the sources and build the LibreOffice extension. Special dependencies of WollMux are hosted at Bintray, which is already configured as maven repository in pom.xml

git clone
git checkout WollMux_18.2
mvn clean package

The compiled extension can be found at oxt/target/WollMux.oxt

Build errors

  • There are files with header to update: Some of the source files don't have a license header. The header can be updated with:
mvn license:update-file-header


External WollMux (Eclipse)

WollMux.oxt extension is not installed in LibreOffice, but is loaded from external by starting a debug session in eclipse. There exist an additional extension WollMux_ButtonsOnly.oxt, which only contains the toolbars and dialogs. This extension must be installed in LibreOffice. Therefore call

mvn -P ButtonsOnly generate-sources

and the extension is build and installed, if the program unopkg is availble. Otherwise you have to manually install the extension, which can be found at oxt/target/WollMux_ButtonsOnly.oxt.

Activate the maven profile "development" in Project > Properties > Maven > Active Maven Profiles.

Configure a debug-configuration of type "Java Application" with main class de.muenchen.allg.itd51.wollmux.DebugExternalWollMux. Add a user defined library to the classpath. The library must contain these jars of LibreOffice which can be found at <path_to_LibreOffice>/program/classes:

  • java_uno.jar
  • juh.jar
  • jurt.jar
  • ridl.jar
  • unoloader.jar
  • unoil.jar

Make sure, that there is no running LibreOffice process before starting debugging.


  • Hot code replacement


  • different startup behaviour

Remote Debugging

If you have a running instance, which you like to debug. You can connect to it by another Eclipse debug-configuration:

  • type: Remote java Application
  • connection type: Standard (Socket Attach)
  • connection properties: localhost, 8000

There are also some configuration changes for LibreOffice necessary. Go to ExtrasOptions...LibreOfficeAdditionalParameter... and add the following parameters:

  • -Xdebug
  • -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n

If suspend is set to y, LibreOffice waits until an external process connects before initializing.


letterhead, template, form, autotext, mail merge,... extension for OpenOffice and LibreOffice




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