'org.atmosphere.extensions:atmosphere-gwt20-server:2.4.2'
<dependency>
<groupId>org.atmosphere.extensions</groupId>
<artifactId>atmosphere-gwt20-server</artifactId>
<version>2.4.2</version>
</dependency>
<dependency org="org.atmosphere.extensions" name="atmosphere-gwt20-server" rev="2.4.2"/>
"org.atmosphere.extensions", "atmosphere-gwt20-server", "2.4.2"