Confusing error message

[GoogleCodeExporter]

The error message:

  "the column property must be specified for
   parameter "+param.getSimpleName()+" in query"

in DMLMethod.java is confusing/misleading.

I got this because I was using a java.util.Date type with a type mapper -- I 
think the loop over JavaType.values() with the comparison of 
javaType.clazz.getName() might have mis-matched on "Date" -- maybe that needs 
to be .getCanonicalName().  I wound up fixing it without tracing down the exact 
problem.

The error could be more informational though -- it seems to be saying that the 
@Column annotation is required, but that wasn't the actual problem -- the 
problem was definitely related to the type of the parameter.  Maybe there are 
two different error conditions there & each should have a separate message.

Original issue reported on code.google.com by eire...@gmail.com on 9 Jun 2011 at 9:33