Jar file detected in WAR but not in DevMode

Hi,

I'am using GWT 2.7 with GXT 3 for my application,

I follow steps described in this link : (http://piotrnowicki.com/2011/03/using-servlets-3-0-servletcontainerinitializer/  ), to create a jar file that contain a java class aim to configure "context-param" of my application using ServletContainerInitializer Interface.

The jar file produced work fine in WAR mode with an external Jetty server. But it not detected when I run the application in the Super DevMode.

Do you have an idea what I can do to make it work ?

Thanks in advance

More details : 

The tree view of my jar 

├── com

│   └── nullhaus

│       └── MyInitializer.class

└── META-INF

    └── services

        └── javax.servlet.ServletContainerInitializer

I copy the jar in WEB-INF/lib folder

If the application server (jetty for example) detect a class that implement this interface (ServletContainerInitializer) it launch the onStartup() method automatically.

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