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Using java-gtk on Windows

Install GTK libraries

See Setting up GTK for Windows

  1. Download and install MSYS2
  2. Install MinGW-w64 Packages:
pacman -S mingw-w64-x86_64-gtk4
pacman -S mingw-w64-x86_64-libadwaita
pacman -S mingw-w64-x86_64-gstreamer
  1. Add C:\msys64\mingw64\bin to the PATH environment variable
  2. Add -Dfile.encoding=UTF8 to the JAVA_TOOL_OPTIONS environment variable.

Build and run sample

git clone https://github.com/bailuk/java-gtk.git
cd java-gtk
.\gradlew.bat generate
.\gradlew.bat build
.\gradlew.bat run

Trouble shoot

Alternative names

GTK for Windows has a different naming schema for libraries than assumed by default. Default library names are configured in Configuration.kt. Alternative names are configured in loader.properties. More alternative names can be added programmatically during runtime: Loader.java.

Windows library load order

Windows library (dll) search paths:

  • Current directory
  • Application directory (java.exe)
  • Windows System directories
  • Windows PATH variable

Related and useful system properties (Java and JNA)

System.setProperty("jna.debug_load", "true");
System.out.println(System.getProperty("java.library.path"));
System.out.println(System.getProperty("jna.library.path"));

JNA library load order

  1. java.library.path
  2. jna.library.path
  3. Resource path: JAR or build\classes\java\main

Dependencies

DLLs depend on other DLLs. In this case linking is done by the Windows OS and not by JNA. To check dependencies, run ldd from WinGW Terminal: ldd library-to-check.dll

DLLs loaded by JNA must be identical (same file, not a copy) with DLLs loaded by Windows.

Naming

lib[name]-[major]-[minor].dll

GTK-4 library: libgtk-4-1.dll. Name used by java-gtk: "gtk-4" => JNA searches for: gtk-4.dll Standard C Library as provided by Microsoft: msvcrt.dll