Impossible to invoke "removeRole" or other MBean methods and "setAttribute" by MBeanServer cause of the same bug in ManagedBean.java at both lines 545 (getSetter method) and 604 (getInvoke method): object = this; Must be replace by: object = bean; Fortunately getGetter method is correct.
This has been fixed in svn and proposed for inclusion in 6.0.x
This has been fixed in 6.0.x and will be included in 6.0.16 onwards.