[GWT] Customize Tomcat configuration in hosted mode

Hello,

Is there a way to customize the tomcat configuration in hosted mode ?

I need to change the file web.xml to declare a datasource for my application,
but the file is overriden each time I start the GwtShell.

The file is located here :

/work/.IntelliJIdea70/system/gwt/Src.6f7b9198/run/tomcat/webapps/ROOT/WEB-INF

Thanks
Hervé