Java Development Tools

This is a pure Java question:

Normally when your throw an Exception you need to declare it in the method header.

Example:

public void setTest() throws MyException
{
throw new MyException("throwing my exception");
}

How come your can throw a JboException in an ADF model class method without having to declare it the method header?
Example:

public void setDeptNo(Number value)
{
 if (value != null && value.intValue() < 0)
 {
 throw new JboException("throwing exception without declaring");
 }
 ...
}

Thanks for enlightening my java knowledge.

Fred