The CA is an innovative vehicle used by Sun for copyright assignment on contributions to its open source projects. The Sun Contributor Agreement(SCA) applies to contributions to any product or project owned or managed by Sun, including projects on netbeans.org.
The primary difference between the JCA and NetBeans' CA is that, while the JCA covers copyright, the NetBeans CA also covers patents. Specifically, with the SCA, if the contribution embodies a patent which the Contributor owns, then by signing the SCA the Contributor gives Sun and all other recipients a license to use that patent.