execute following commands in order to create keystore files (password always was ddg1234) keytool -genkey -v -keystore my-privateKey.store -alias ddg -keyalg RSA -keysize 2048 -validity 10000 keytool -export -alias ddg -file my-certfile.cer -keystore my-privateKey.store (not so important) keytool -import -alias publicDdg -file my-certfile.cer -keystore my-publicKey.store (not so important) and gradle tasks choose: installWebstartDist , and .jnlp file with lib/*.jars will be generated. and run : javaws /home/edutilos/Desktop/tutorials/ControlFXTest/build/jnlp/launch.jnlp //or create my-javaws.desktop in linux (in one of the following location) 1) /usr/share/applications (for the current user) 2) ~/.local/share/applications/ (for all users) with following content: [Desktop Entry] Encoding=UTF-8 Name=Java 8 Web Start Comment=Java 8 Web Start Exec=/home/edutilos/Applications/jdk1.8.0_131/bin/javaws %u Terminal=false Type=Application Icon=javaws Categories=Application;Network; MimeType=application/x-java-jnlp-file; and create index.html with following content: <!DOCTYPE html> <html> <head> <title>run launch.jnlp</title> </head> <body> <a href="launch.jnlp">launch jnlp</a> </body> </html> and open this index.html in firefox (in chrome that does not work) . Firefox will give option to run with (and choose "Java 8 Web Start")