Erased data type

I have an app with a gui that can develop a lot of data.  There is a
save button, which writes the data out using serialization.

Then, there is a load button, which reads the data back in, using this
line:

        destinations = (ArrayList<ScheduleDestination>) is.readObject()
;

Where destinations is defined elsewhere as 
	
        ArrayList<ScheduleDestination> destinations ;

On the line that reads the object back in, there is a compiler flag:

        Type Safety: The cast from Object to
ArrayList<ScheduleDestination> is actually checking against the erased
type ArrayList.

What does this flag mean?  I have googled fairly creatively and can't
find anything which tells me what it means or how to make it go away.



Ivan Mann

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