Service POJO deployment throws NullPointerException

I have a very simple test service POJO that I'm trying to deploy to JBoss AS 6 on Linux. But it's failing with below exception:
Java code for the test can be obtained from the forum link: http://community.jboss.org/message/581413

14:42:21,599 ERROR [AbstractKernelController] Error installing to Create: name=jboss.j2ee:ear=foliage.ear,jar=foliageEJB.jar,name=CoolSystemInitService,service=EJB3 state=Configured: java.lang.NullPointerException
at org.jboss.weld.integration.instantiator.Jsr299BeanInstantiator.locateWeldManager(Jsr299BeanInstantiator.java:102) [:6.0.0.20101110-CR1]
at org.jboss.weld.integration.instantiator.Jsr299BeanInstantiator.getWeldManager(Jsr299BeanInstantiator.java:93) [:6.0.0.20101110-CR1]
at org.jboss.weld.integration.instantiator.Jsr299BeanInstantiator.create(Jsr299BeanInstantiator.java:72) [:6.0.0.20101110-CR1]
at org.jboss.ejb3.EJBContainer.construct(EJBContainer.java:997) [:1.6.3]
at org.jboss.ejb3.service.ServiceContainer.create(ServiceContainer.java:205) [:1.6.3]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_21]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [:1.6.0_21]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_21]
at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_21]
at org.jboss.reflect.plugins.introspection.ReflectionUtils.invoke(ReflectionUtils.java:60) [jboss-reflect.jar:2.2.0.Alpha9]
at org.jboss.reflect.plugins.introspection.ReflectMethodInfoImpl.invoke(ReflectMethodInfoImpl.java:168) [jboss-reflect.jar:2.2.0.Alpha9]