Re: visad.TypeException: ScalarType: name already used

>> If I call the
>> server more than once it generates the exception:
>> 
>>   visad.TypeException: ScalarType: name already used
>> 
>> at this line
>> 
>>   RealType X=new RealType("X",null,null);
> 
> Great to hear you're making such good progress.  You can solve
> your problem like this:
>  
>   RealType X = RealType.getRealTypeByName("X");
>   if (X == null) X = new RealType("X",null,null);

An alternative solution (though probably not the one you want to use) is:

        RealType X;
        try {
          X = new RealType("X",null,null);
        } catch (TypeException e) {
          X = RealType.getRealTypeByName("X");
        }

Bill's solution is probably better for a server, since his code assumes
the variable already exists (which sounds like the more common case for
your application)