WebSocket endpoint injection on Tomcat

Everything works fine in glassfish and Wildfly.
In tomcat bean injection works fine in servlet, and ServletContextListener.
But in WebSocket endpoint, no way.

• I add of course a maven dependency of weld
  <dependency>
  <groupId>org.jboss.weld.servlet</groupId>
  <artifactId>weld-servlet-core</artifactId>
  <version>3.0.0.Alpha11</version>
  </dependency>
• In context.xml I add the resource BeanManager
  <Resource auth="Container" factory="org.jboss.weld.resources.ManagerObjectFactory" name="BeanManager" type="javax.enterprise.inject.spi.BeanManager"/>
• And in web.xml, I add the listener and resource-ref
  <listener>
  <listener-class>org.jboss.weld.environment.servlet.Listener</listener-class>
  </listener>
  <resource-env-ref>
  <resource-env-ref-name>BeanManager</resource-env-ref-name>
  <resource-env-ref-type>javax.enterprise.inject.spi.BeanManager</resource-env-ref-type>
  </resource-env-ref>