...

see Intro and Compatibility

Glassfish v3 and new versions of Weld

Usually it's possible to upgrade Glassfish with the newest version of Weld. That's not the case with Weld v1.1.2 due to a cache which broke the integration with Glassfish at least up to v3.1.1. Since CODI will resolve the first bean you will see e.g. something like: Critical error during deployment: java.lang.NoClassDefFoundError: org/jboss/weld/context/cache/RequestScopedBeanCache at org.apache.myfaces.extensions.cdi.core.api.config.CodiCoreConfig$Proxy$$$_WeldClientProxy.isAdvancedQualifierRequiredForDependencyInjection(CodiCoreConfig$Proxy$$$_WeldClientProxy.java). However, that isn't a CODI bug. If you use the version of weld which is supported by Glassfish officially, you won't have such problems.