To my surprise Netbeans UML plugin is no longer supported. Jdeveloper UML features is not equivalent to this plugin so my question.
Here's what Oracle says, as of January 27, 2010
What are Oracle’s plans for NetBeans?
Oracle has a strong track record of demonstrating commitment to choice for Java developers. As such, NetBeans is expected to provide an additional open source option and complement to the two free tools Oracle already offers for enterprise Java development: Oracle JDeveloper and Oracle Enterprise Pack for Eclipse. While Oracle JDeveloper remains Oracle’s strategic development tool for the broad portfolio of Oracle Fusion Middleware products and for Oracle’s next generation of enterprise applications, developers will be able to use whichever free tool they are most comfortable with for pure Java and Java EE development: JDeveloper, Enterprise Pack for Eclipse, or NetBeans.
Now, you can read between the lines if you wish, and assume that the support for NetBeans will be for "pure Java and Java EE development" only, which might not include UML tools.
I guess we will see.