<servlet>
<servlet-name>TomcatErraiServlet</servlet-name>
<servlet-class>org.jboss.errai.bus.server.servlet.TomcatCometServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet
<servlet-mapping>
<servlet-name>TomcatErraiServlet</servlet-name>
<url-pattern>*.erraiBus</url-pattern>
</servlet-mapping>
JBoss AS 4 and 5 (Requires APR connector)
<servlet>
<servlet-name>JBossErraiServlet</servlet-name>
<servlet-class>org.jboss.errai.bus.server.servlet.JBossCometServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>JBossErraiServlet</servlet-name>
<url-pattern>*.erraiBus</url-pattern>
</servlet-mapping>