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Template for a simple Vaadin application that only requires a Servlet 3.0 container to run.

In Germany and Austria the Data Protection Legislation forbids car drivers to use Dash Cams as evidence in case of car accidents. Dash Cams usually record faces and car tags. Tough, these are private information and should not be recorded unless one has permission to do so.

This project focuses on developing a solution which allows Dash Cams to be used as evividence in case of car accidents while ensuring that the requirements stated by the Data Protection Law are met. The Privacy Crash Cam Smartphone App records one minute of videomaterial when a crash occours and encrypts it. After storing the encrypted media file to the device storage the user can upload it to a server which will decrypt and anonymize the video. This will render faces and car tags unrecognizable and offer the result as mp4 download to the user. Managing and downloading the anonymized video as well as managing user accounts is done via the web interface.

As such, this project consists of three parts (App, Web Service and Web Interface). You can find each part in a separate git repository.


To compile the entire project, run "mvn install".

To run the application, run "mvn jetty:run" and open http://localhost:8080/ .

To produce a deployable production mode WAR:

  • change productionMode to true in the servlet class configuration (nested in the UI class)
  • run "mvn clean package"
  • test the war file with "mvn jetty:run-war"

Client-Side compilation

The generated maven project is using an automatically generated widgetset by default. When you add a dependency that needs client-side compilation, the maven plugin will automatically generate it for you. Your own client-side customisations can be added into package "client".

Debugging client side code

  • run "mvn vaadin:run-codeserver" on a separate console while the application is running
  • activate Super Dev Mode in the debug window of the application

Developing a theme using the runtime compiler

When developing the theme, Vaadin can be configured to compile the SASS based theme at runtime in the server. This way you can just modify the scss files in your IDE and reload the browser to see changes.

To use the runtime compilation, open pom.xml and comment out the compile-theme goal from vaadin-maven-plugin configuration. To remove a possibly existing pre-compiled theme, run "mvn clean package" once.

When using the runtime compiler, running the application in the "run" mode (rather than in "debug" mode) can speed up consecutive theme compilations significantly.

It is highly recommended to disable runtime compilation for production WAR files.

Using Vaadin pre-releases

If Vaadin pre-releases are not enabled by default, use the Maven parameter "-P vaadin-prerelease" or change the activation default value of the profile in pom.xml .


A WebInterface for PrivcayCrashCam project (Account-Management, Video-Management)







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