Requirement: properties.objects

The setObjectProperty method accepts values of Boolean, Byte, Short, Integer, Long, Float, Double and String. An attempt to use any other class must throw a JMS MessageFormatException.
The getObjectProperty method only returns values of null, Boolean, Byte, Short, Integer, Long, Float, Double and String. A null value is returned if a property by the specified name does not exist.

See:

• Section 3.5.5, Property Values as Objects
• Section 3.5.8, Nonexistent Properties