verifying the 6730926 in the context of the JDK 7 b34 PIT I saw that the throw clauses that have been added to createMBean and registerMBean have their text garbled, hence a wrong font for a part of their description.
Extract:
"RuntimeMBeanException - If the postRegister (MBeanRegistration interface) method of the MBean throws a RuntimeException, the registerMBean" <<<< after that point font is wrong.