able</code> 
 Java objects can be used.

 <P>If a collection of Java objects must be sent, one of the 
 <code>Collection</code> classes provided since JDK 1.2 can be used.

 <P>When a client receives an <code>ObjectMessage</code>, it is in read-only 
 mode. If a client attempts to write to the message at this point, a 
 <code>MessageNotWriteableException</code> is thrown. If 
 <code>clearBody</code> is called, the message can now be both read from and 
 written to.</div>
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