There is 7 occurences of "1.2" to speak about the JMX Specification version into the Mustang javadoc (as of b55).
They might be reworked as Mustang embeds JMX 1.3.

% sfa "version 1.2"
./loading/package.html: Specification of the JMX API, version 1.2</a>
./monitor/package.html: Specification of the JMX API, version 1.2</a>
./relation/package.html: Specification of the JMX API, version 1.2</a> (Chapter
./modelmbean/package.html: Specification of the JMX API, version 1.2</a>
./openmbean/package.html: Specification of the JMX API, version 1.2</a>
./package.html: Specification of the JMX API, version 1.2</a>
./DefaultLoaderRepository.java: * As of version 1.2 of the JMX API, that functionality is