The set of types that can be referenced by an Open MBean is by design
limited. It includes the primitive wrapper types such as java.lang.Integer
and java.lang.Boolean. However, it does not include the primitive types
such as int and boolean. When the type is just Integer or Boolean there
is no great difference to a client, because reflection treats this the
same as int or boolean anyway. But when it is Integer[] or Boolean[] it
is inconvenient and inefficient.

The suggested change is to define new constants in the SimpleType class
called PRIMITIVE_INT, PRIMITIVE_BOOLEAN, etc, to complement the existing
constants INTEGER, BOOLEAN, etc.

The serial form of these classes will set a new serializable boolean field
"primitive" to true and will have a type name that is the corresponding
wrapper class, e.g. java.lang.Integer for int. This will mean that interoperation with JMX API implementations that predate this change will be possible. Such implementations will ignore this field, so they will see a
java.lang.Integer instead of an int. This will potentially cause problems
for int[] etc (seen as Integer[]) but not for plain int.