Serialization question...

[Ryan Cornia]

In my web application, I have all of my forms declared as -
 
public final class <FORM_NAME> extends
org.apache.struts.validator.ValidatorForm implements Serializable { }
 
In my tomcat 4.1.12 logs, however, I keep getting errors -
 
"Cannot serialize session attribute <FORM_NAME>...."
 
Do I need to write a serialization function for each form? I assumed
this was taken care of in org.apache.struts.validator.ValidatorForm. 
 
Thanks,
Ryan