Which XML namespace to use with JSF 2.2 and up

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Which one is recommended?

Go ahead with XML namespaces on xmlns.jcp.org domain. This was newly introduced since Java EE 7 in 2013 (which covers a.o. JSF 2.2, Servlet 3.1, CDI 1.1, etc). Do note that this not only affects Facelets files, but also XML configuration files such as faces-config.xml, web.xml, beans.xml, etc.

The old XML namespaces on java.sun.com are still there for backwards compatibility, but the support will eventually disappear in a future Java EE version. You should migrate your code base as soon as you can. It should be a trivial task using “find and replace in all files” facility offered by the average IDE.

Only older Mojarra 2.2.0 / 2.2.1 versions have had bugs related to the XML namespace changes, but those should not manifest in newer versions. See also a.o.

and why was this changed?

Because Java is not from Sun anymore since 2010. Note that they were smart to not make it java.oracle.com or something tight coupled to the currently owning company. It’s now nicely and independently tied to the JCP (Java Community Process), the one really responsible for managing the Java (EE) specifications.

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