Currently, Weld 2.2.10.SP1 relies on guava 13.0.1 which restricts the usage of guava in other projects due to classloader issues. Currently in Glassfish 4.1 weld depends on 13.0.1 which restricts the ability of projects to use newer versions of guava due to Glassfish's classloader delegation model. It would be useful if weld were to be shipped with guava shaded under a different package name.